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[PATCH 3/3] vmevent: Should not grab mutex in the atomic context

by Anton Vorontsov

There is not need to grab mutex in the atomic context, moreover this is wrong and causes the following bug: BUG: sleeping function called from invalid context at kernel/mutex.c:271 in_atomic(): 1, irqs_disabled(): 1, pid: 1056, name: m no locks held by m/1056. irq event stamp: 58768 hardirqs last enabled at (58767): [<ffffffff8101ca35>] do_page_fault+0x275/0x450 hardirqs last disabled at (58768): [<ffffffff81325a2b>] apic_timer_interrupt+0x6b/0x80 softirqs last enabled at (58676): [<ffffffff81038def>] __do_softirq+0x10f/0x160 softirqs last disabled at (58671): [<ffffffff813262ac>] call_softirq+0x1c/0x26 Pid: 1056, comm: m Not tainted 3.2.0+ #3 Call Trace: <IRQ> [<ffffffff81062530>] ? print_irqtrace_events+0xd0/0xe0 [<ffffffff8102f5da>] __might_sleep+0x12a/0x1e0 [<ffffffff81321dbc>] mutex_lock_nested+0x3c/0x340 [<ffffffff81053a8c>] ? __run_hrtimer+0x4c/0x100 [<ffffffff810bd920>] ? vmevent_read+0x100/0x100 [<ffffffff810bd79e>] vmevent_sample+0x6e/0xf0 [<ffffffff810bd946>] vmevent_timer_fn+0x26/0x60 [<ffffffff81053a92>] __run_hrtimer+0x52/0x100 [<ffffffff81054463>] hrtimer_interrupt+0xf3/0x220 [<ffffffff810166d4>] smp_apic_timer_interrupt+0x64/0xa0 [<ffffffff81325a30>] apic_timer_interrupt+0x70/0x80 <EOI> [<ffffffff8101ca3a>] ? do_page_fault+0x27a/0x450 [<ffffffff8101ca35>] ? do_page_fault+0x275/0x450 [<ffffffff810036bf>] ? do_softirq+0x6f/0xc0 [<ffffffff8132485d>] ? retint_restore_args+0xe/0xe [<ffffffff8132484a>] ? retint_swapgs+0xe/0x13 [<ffffffff8116b31d>] ? trace_hardirqs_off_thunk+0x3a/0x3c [<ffffffff81324a3f>] page_fault+0x1f/0x30 Signed-off-by: Anton Vorontsov <anton.vorontsov(a)linaro.org> --- The patch is for git://github.com/penberg/linux.git vmevent/core. mm/vmevent.c | 4 ---- 1 files changed, 0 insertions(+), 4 deletions(-) diff --git a/mm/vmevent.c b/mm/vmevent.c index 1375f9d..1dbefb5 100644 --- a/mm/vmevent.c +++ b/mm/vmevent.c @@ -71,8 +71,6 @@ static void vmevent_sample(struct vmevent_watch *watch) if (!vmevent_match(watch, &event)) return; - mutex_lock(&watch->mutex); - watch->pending = true; if (watch->config.event_attrs & VMEVENT_EATTR_NR_AVAIL_PAGES) @@ -85,8 +83,6 @@ static void vmevent_sample(struct vmevent_watch *watch) watch->attr_values[n++] = event.nr_swap_pages; watch->nr_attrs = n; - - mutex_unlock(&watch->mutex); } static enum hrtimer_restart vmevent_timer_fn(struct hrtimer *hrtimer) -- 1.7.7.6

14 years

[PATCH 2/3] vmevent: Fix deadlock when using si_meminfo()

by Anton Vorontsov

si_meminfo() calls nr_blockdev_pages() that grabs bdev_lock, but it is not safe to grab the lock from the hardirq context (the lock is never taken with an _irqsave variant in block_dev.c). When taken from an inappropriate context it easily causes the following deadlock: - - - - ================================= [ INFO: inconsistent lock state ] 3.2.0+ #1 --------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. swapper/0/0 [HC1[1]:SC0[0]:HE0:SE1] takes: (bdev_lock){?.+...}, at: [<ffffffff810f1017>] nr_blockdev_pages+0x17/0x70 {HARDIRQ-ON-W} state was registered at: [<ffffffff81061b20>] mark_irqflags+0x140/0x1b0 [<ffffffff81062f03>] __lock_acquire+0x4c3/0x9c0 [<ffffffff810639c6>] lock_acquire+0x96/0xc0 [<ffffffff8131c58c>] _raw_spin_lock+0x2c/0x40 [<ffffffff810f1017>] nr_blockdev_pages+0x17/0x70 [<ffffffff81089ba8>] si_meminfo+0x38/0x60 [<ffffffff81675493>] eventpoll_init+0x11/0xa1 [<ffffffff8165eb40>] do_one_initcall+0x7a/0x12e [<ffffffff8165ec8e>] kernel_init+0x9a/0x114 [<ffffffff8131e934>] kernel_thread_helper+0x4/0x10 irq event stamp: 135250 hardirqs last enabled at (135247): [<ffffffff81009897>] default_idle+0x27/0x50 hardirqs last disabled at (135248): [<ffffffff8131e1ab>] apic_timer_interrupt+0x6b/0x80 softirqs last enabled at (135250): [<ffffffff8103814e>] _local_bh_enable+0xe/0x10 softirqs last disabled at (135249): [<ffffffff81038665>] irq_enter+0x65/0x80 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(bdev_lock); <Interrupt> lock(bdev_lock); *** DEADLOCK *** no locks held by swapper/0/0. - - - - The patch fixes the issue by using totalram_pages instead of si_meminfo(). p.s. Note that VMEVENT_EATTR_NR_SWAP_PAGES type calls si_swapinfo(), which has a very similar problem. But there is no easy way to fix it. Do we have any use case for the VMEVENT_EATTR_NR_SWAP_PAGES event? If not, I'd vote for removing it and thus keeping things simple. Otherwise we would have two options: 1. Modify swap accounting for vmevent (either start grabbing _irqsave variant of swapfile.c's swap_lock, or try to make the accounting atomic); 2. Start using kthreads for vmevent_sample(). Signed-off-by: Anton Vorontsov <anton.vorontsov(a)linaro.org> --- The patch is for git://github.com/penberg/linux.git vmevent/core. mm/vmevent.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/vmevent.c b/mm/vmevent.c index 2342752..1375f9d 100644 --- a/mm/vmevent.c +++ b/mm/vmevent.c @@ -51,18 +51,18 @@ static bool vmevent_match(struct vmevent_watch *watch, static void vmevent_sample(struct vmevent_watch *watch) { struct vmevent_watch_event event; - struct sysinfo si; int n = 0; memset(&event, 0, sizeof(event)); event.nr_free_pages = global_page_state(NR_FREE_PAGES); - si_meminfo(&si); - event.nr_avail_pages = si.totalram; + event.nr_avail_pages = totalram_pages; #ifdef CONFIG_SWAP if (watch->config.event_attrs & VMEVENT_EATTR_NR_SWAP_PAGES) { + struct sysinfo si; + si_swapinfo(&si); event.nr_swap_pages = si.totalswap; } -- 1.7.7.6

14 years

[PATCH 1/3] vmevent: Fix build for SWAP=n case

by Anton Vorontsov

Caught this build failure: CC mm/vmevent.o mm/vmevent.c:17:6: error: expected identifier or '(' before numeric constant mm/vmevent.c:18:1: warning: no semicolon at end of struct or union [enabled by default] mm/vmevent.c: In function 'vmevent_sample': mm/vmevent.c:84:36: error: expected identifier before numeric constant make[1]: *** [mm/vmevent.o] Error 1 make: *** [mm/] Error 2 This is because linux/swap.h defines nr_swap_pages to 0L, and so things break. Fix this by undefinding it back, as we don't use it anyway. Signed-off-by: Anton Vorontsov <anton.vorontsov(a)linaro.org> --- The patch is for git://github.com/penberg/linux.git vmevent/core. mm/vmevent.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/mm/vmevent.c b/mm/vmevent.c index 37d2c5f..2342752 100644 --- a/mm/vmevent.c +++ b/mm/vmevent.c @@ -6,6 +6,7 @@ #include <linux/poll.h> #include <linux/slab.h> #include <linux/swap.h> +#undef nr_swap_pages /* This is defined to a constant for SWAP=n case */ #define VMEVENT_MAX_FREE_THRESHOD 100 -- 1.7.7.6

14 years

[PATCH] Initial Device Tree system for Snowball

by Niklas Hernaeus

From: Niklas Hernaeus <niklas.hernaeus(a)linaro.org> This is the base system for using Device Tree for Snowball. The new boardfile is a slightly modified copy of the original board file, so new Device Tree stuff can simply be added and code removed, while functionality stays the same. Signed-off-by: Niklas Hernaeus <niklas.hernaeus(a)linaro.org> --- arch/arm/boot/dts/snowball.dts | 32 ++ arch/arm/mach-ux500/Kconfig | 17 +- arch/arm/mach-ux500/Makefile | 5 +- arch/arm/mach-ux500/board-mop500-dt.c | 729 +++++++++++++++++++++++++++++++ arch/arm/mach-ux500/include/mach/irqs.h | 2 +- 5 files changed, 779 insertions(+), 6 deletions(-) create mode 100644 arch/arm/boot/dts/snowball.dts create mode 100644 arch/arm/mach-ux500/board-mop500-dt.c diff --git a/arch/arm/boot/dts/snowball.dts b/arch/arm/boot/dts/snowball.dts new file mode 100644 index 0000000..02305fb --- /dev/null +++ b/arch/arm/boot/dts/snowball.dts @@ -0,0 +1,32 @@ +/* + * Copyright 2011 ST-Ericsson AB + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/dts-v1/; + +/ { + model = "Calao Systems Snowball platform with device tree"; + compatible = "calaosystems,snowball-a9500"; + + #address-cells = <1>; + #size-cells = <1>; + + memory { + device_type = "memory"; + reg = <0x00000000 0x20000000>; + }; + + soc-u9500 { + #address-cells = <1>; + #size-cells = <1>; + compatible = "simple-bus"; + ranges; + }; +}; diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig index 52af004..be7e4fe 100644 --- a/arch/arm/mach-ux500/Kconfig +++ b/arch/arm/mach-ux500/Kconfig @@ -27,19 +27,22 @@ menu "Ux500 target platform (boards)" config MACH_U8500 bool "U8500 Development platform" depends on UX500_SOC_DB8500 + depends on !USE_OF select TPS6105X help Include support for the mop500 development platform. config MACH_HREFV60 - bool "U85000 Development platform, HREFv60 version" - depends on UX500_SOC_DB8500 - help - Include support for the HREFv60 new development platform. + bool "U85000 Development platform, HREFv60 version" + depends on UX500_SOC_DB8500 + depends on !USE_OF + help + Include support for the HREFv60 new development platform. config MACH_SNOWBALL bool "U8500 Snowball platform" depends on UX500_SOC_DB8500 + depends on !USE_OF select MACH_U8500 help Include support for the snowball development platform. @@ -49,6 +52,12 @@ config MACH_U5500 depends on UX500_SOC_DB5500 help Include support for the U5500 development platform. +config MACH_UX500_DT + def_bool y if USE_OF + depends on UX500_SOC_DB8500 || UX500_SOC_DB5500 + +config MACH_MOP500 + def_bool y if MACH_U8500 || MACH_UX500_DT endmenu config UX500_DEBUG_UART diff --git a/arch/arm/mach-ux500/Makefile b/arch/arm/mach-ux500/Makefile index 6bd2f45..05bee25 100644 --- a/arch/arm/mach-ux500/Makefile +++ b/arch/arm/mach-ux500/Makefile @@ -7,7 +7,10 @@ obj-y := clock.o cpu.o devices.o devices-common.o \ obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o obj-$(CONFIG_UX500_SOC_DB5500) += cpu-db5500.o dma-db5500.o obj-$(CONFIG_UX500_SOC_DB8500) += cpu-db8500.o devices-db8500.o -obj-$(CONFIG_MACH_U8500) += board-mop500.o board-mop500-sdi.o \ + +obj-$(CONFIG_MACH_UX500_DT) += board-mop500-dt.o +obj-$(CONFIG_MACH_U8500) += board-mop500.o +obj-$(CONFIG_MACH_MOP500) += board-mop500-sdi.o \ board-mop500-regulators.o \ board-mop500-uib.o board-mop500-stuib.o \ board-mop500-u8500uib.o \ diff --git a/arch/arm/mach-ux500/board-mop500-dt.c b/arch/arm/mach-ux500/board-mop500-dt.c new file mode 100644 index 0000000..33f4a83 --- /dev/null +++ b/arch/arm/mach-ux500/board-mop500-dt.c @@ -0,0 +1,729 @@ +/* + * Copyright (C) 2008-2009 ST-Ericsson + * + * Author: Srinidhi KASAGAR <srinidhi.kasagar(a)stericsson.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/amba/bus.h> +#include <linux/amba/pl022.h> +#include <linux/amba/serial.h> +#include <linux/spi/spi.h> +#include <linux/mfd/abx500/ab8500.h> +#include <linux/regulator/ab8500.h> +#include <linux/mfd/tc3589x.h> +#include <linux/mfd/tps6105x.h> +#include <linux/mfd/abx500/ab8500-gpio.h> +#include <linux/leds-lp5521.h> +#include <linux/input.h> +#include <linux/smsc911x.h> +#include <linux/gpio_keys.h> +#include <linux/delay.h> + +#include <linux/of.h> +#include <linux/of_platform.h> + +#include <linux/leds.h> +#include <asm/mach-types.h> +#include <asm/mach/arch.h> +#include <asm/hardware/gic.h> + +#include <plat/i2c.h> +#include <plat/ste_dma40.h> +#include <plat/pincfg.h> +#include <plat/gpio-nomadik.h> + +#include <mach/hardware.h> +#include <mach/setup.h> +#include <mach/devices.h> +#include <mach/irqs.h> + +#include "pins-db8500.h" +#include "ste-dma40-db8500.h" +#include "devices-db8500.h" +#include "board-mop500.h" +#include "board-mop500-regulators.h" + +static struct gpio_led snowball_led_array[] = { + { + .name = "user_led", + .default_trigger = "none", + .gpio = 142, + }, +}; + +static struct gpio_led_platform_data snowball_led_data = { + .leds = snowball_led_array, + .num_leds = ARRAY_SIZE(snowball_led_array), +}; + +static struct platform_device snowball_led_dev = { + .name = "leds-gpio", + .dev = { + .platform_data = &snowball_led_data, + }, +}; + +static struct ab8500_gpio_platform_data ab8500_gpio_pdata = { + .gpio_base = MOP500_AB8500_GPIO(0), + .irq_base = MOP500_AB8500_VIR_GPIO_IRQ_BASE, + /* config_reg is the initial configuration of ab8500 pins. + * The pins can be configured as GPIO or alt functions based + * on value present in GpioSel1 to GpioSel6 and AlternatFunction + * register. This is the array of 7 configuration settings. + * One has to compile time decide these settings. Below is the + * explanation of these setting + * GpioSel1 = 0x00 => Pins GPIO1 to GPIO8 are not used as GPIO + * GpioSel2 = 0x1E => Pins GPIO10 to GPIO13 are configured as GPIO + * GpioSel3 = 0x80 => Pin GPIO24 is configured as GPIO + * GpioSel4 = 0x01 => Pin GPIo25 is configured as GPIO + * GpioSel5 = 0x7A => Pins GPIO34, GPIO36 to GPIO39 are conf as GPIO + * GpioSel6 = 0x00 => Pins GPIO41 & GPIo42 are not configured as GPIO + * AlternaFunction = 0x00 => If Pins GPIO10 to 13 are not configured + * as GPIO then this register selectes the alternate fucntions + */ + .config_reg = {0x00, 0x1E, 0x80, 0x01, + 0x7A, 0x00, 0x00}, +}; + +static struct gpio_keys_button snowball_key_array[] = { + { + .gpio = 32, + .type = EV_KEY, + .code = KEY_1, + .desc = "userpb", + .active_low = 1, + .debounce_interval = 50, + .wakeup = 1, + }, + { + .gpio = 151, + .type = EV_KEY, + .code = KEY_2, + .desc = "extkb1", + .active_low = 1, + .debounce_interval = 50, + .wakeup = 1, + }, + { + .gpio = 152, + .type = EV_KEY, + .code = KEY_3, + .desc = "extkb2", + .active_low = 1, + .debounce_interval = 50, + .wakeup = 1, + }, + { + .gpio = 161, + .type = EV_KEY, + .code = KEY_4, + .desc = "extkb3", + .active_low = 1, + .debounce_interval = 50, + .wakeup = 1, + }, + { + .gpio = 162, + .type = EV_KEY, + .code = KEY_5, + .desc = "extkb4", + .active_low = 1, + .debounce_interval = 50, + .wakeup = 1, + }, +}; + +static struct gpio_keys_platform_data snowball_key_data = { + .buttons = snowball_key_array, + .nbuttons = ARRAY_SIZE(snowball_key_array), +}; + +static struct platform_device snowball_key_dev = { + .name = "gpio-keys", + .id = -1, + .dev = { + .platform_data = &snowball_key_data, + } +}; + +static struct smsc911x_platform_config snowball_sbnet_cfg = { + .irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH, + .irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL, + .flags = SMSC911X_USE_16BIT | SMSC911X_FORCE_INTERNAL_PHY, + .shift = 1, +}; + +static struct resource sbnet_res[] = { + { + .name = "smsc911x-memory", + .start = (0x5000 << 16), + .end = (0x5000 << 16) + 0xffff, + .flags = IORESOURCE_MEM, + }, + { + .start = NOMADIK_GPIO_TO_IRQ(140), + .end = NOMADIK_GPIO_TO_IRQ(140), + .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE, + }, +}; + +static struct platform_device snowball_sbnet_dev = { + .name = "smsc911x", + .num_resources = ARRAY_SIZE(sbnet_res), + .resource = sbnet_res, + .dev = { + .platform_data = &snowball_sbnet_cfg, + }, +}; + +static struct ab8500_platform_data ab8500_platdata = { + .irq_base = MOP500_AB8500_IRQ_BASE, + .regulator_reg_init = ab8500_regulator_reg_init, + .num_regulator_reg_init = ARRAY_SIZE(ab8500_regulator_reg_init), + .regulator = ab8500_regulators, + .num_regulator = ARRAY_SIZE(ab8500_regulators), + .gpio = &ab8500_gpio_pdata, +}; + +static struct resource ab8500_resources[] = { + [0] = { + .start = IRQ_DB8500_AB8500, + .end = IRQ_DB8500_AB8500, + .flags = IORESOURCE_IRQ + } +}; + +struct platform_device ab8500_device = { + .name = "ab8500-i2c", + .id = 0, + .dev = { + .platform_data = &ab8500_platdata, + }, + .num_resources = 1, + .resource = ab8500_resources, +}; + +/* + * TPS61052 + */ + +static struct tps6105x_platform_data mop500_tps61052_data = { + .mode = TPS6105X_MODE_VOLTAGE, + .regulator_data = &tps61052_regulator, +}; + +/* + * TC35892 + */ + +static void mop500_tc35892_init(struct tc3589x *tc3589x, unsigned int base) +{ + mop500_sdi_tc35892_init(); +} + +static struct tc3589x_gpio_platform_data mop500_tc35892_gpio_data = { + .gpio_base = MOP500_EGPIO(0), + .setup = mop500_tc35892_init, +}; + +static struct tc3589x_platform_data mop500_tc35892_data = { + .block = TC3589x_BLOCK_GPIO, + .gpio = &mop500_tc35892_gpio_data, + .irq_base = MOP500_EGPIO_IRQ_BASE, +}; + +static struct lp5521_led_config lp5521_pri_led[] = { + [0] = { + .chan_nr = 0, + .led_current = 0x2f, + .max_current = 0x5f, + }, + [1] = { + .chan_nr = 1, + .led_current = 0x2f, + .max_current = 0x5f, + }, + [2] = { + .chan_nr = 2, + .led_current = 0x2f, + .max_current = 0x5f, + }, +}; + +static struct lp5521_platform_data __initdata lp5521_pri_data = { + .label = "lp5521_pri", + .led_config = &lp5521_pri_led[0], + .num_channels = 3, + .clock_mode = LP5521_CLOCK_EXT, +}; + +static struct lp5521_led_config lp5521_sec_led[] = { + [0] = { + .chan_nr = 0, + .led_current = 0x2f, + .max_current = 0x5f, + }, + [1] = { + .chan_nr = 1, + .led_current = 0x2f, + .max_current = 0x5f, + }, + [2] = { + .chan_nr = 2, + .led_current = 0x2f, + .max_current = 0x5f, + }, +}; + +static struct lp5521_platform_data __initdata lp5521_sec_data = { + .label = "lp5521_sec", + .led_config = &lp5521_sec_led[0], + .num_channels = 3, + .clock_mode = LP5521_CLOCK_EXT, +}; + +static struct i2c_board_info __initdata mop500_i2c0_devices[] = { + { + I2C_BOARD_INFO("tc3589x", 0x42), + .irq = NOMADIK_GPIO_TO_IRQ(217), + .platform_data = &mop500_tc35892_data, + }, + /* I2C0 devices only available prior to HREFv60 */ + { + I2C_BOARD_INFO("tps61052", 0x33), + .platform_data = &mop500_tps61052_data, + }, +}; + +#define NUM_PRE_V60_I2C0_DEVICES 1 + +static struct i2c_board_info __initdata mop500_i2c2_devices[] = { + { + /* lp5521 LED driver, 1st device */ + I2C_BOARD_INFO("lp5521", 0x33), + .platform_data = &lp5521_pri_data, + }, + { + /* lp5521 LED driver, 2st device */ + I2C_BOARD_INFO("lp5521", 0x34), + .platform_data = &lp5521_sec_data, + }, + { + /* Light sensor Rohm BH1780GLI */ + I2C_BOARD_INFO("bh1780", 0x29), + }, +}; + +#define U8500_I2C_CONTROLLER(id, _slsu, _tft, _rft, clk, t_out, _sm) \ +static struct nmk_i2c_controller u8500_i2c##id##_data = { \ + /* \ + * slave data setup time, which is \ + * 250 ns,100ns,10ns which is 14,6,2 \ + * respectively for a 48 Mhz \ + * i2c clock \ + */ \ + .slsu = _slsu, \ + /* Tx FIFO threshold */ \ + .tft = _tft, \ + /* Rx FIFO threshold */ \ + .rft = _rft, \ + /* std. mode operation */ \ + .clk_freq = clk, \ + /* Slave response timeout(ms) */\ + .timeout = t_out, \ + .sm = _sm, \ +} + +/* + * The board uses 4 i2c controllers, initialize all of + * them with slave data setup time of 250 ns, + * Tx & Rx FIFO threshold values as 8 and standard + * mode of operation + */ +U8500_I2C_CONTROLLER(0, 0xe, 1, 8, 100000, 200, I2C_FREQ_MODE_FAST); +U8500_I2C_CONTROLLER(1, 0xe, 1, 8, 100000, 200, I2C_FREQ_MODE_FAST); +U8500_I2C_CONTROLLER(2, 0xe, 1, 8, 100000, 200, I2C_FREQ_MODE_FAST); +U8500_I2C_CONTROLLER(3, 0xe, 1, 8, 100000, 200, I2C_FREQ_MODE_FAST); + +static void __init mop500_i2c_init(void) +{ + db8500_add_i2c0(&u8500_i2c0_data); + db8500_add_i2c1(&u8500_i2c1_data); + db8500_add_i2c2(&u8500_i2c2_data); + db8500_add_i2c3(&u8500_i2c3_data); +} + +static struct gpio_keys_button mop500_gpio_keys[] = { + { + .desc = "SFH7741 Proximity Sensor", + .type = EV_SW, + .code = SW_FRONT_PROXIMITY, + .active_low = 0, + .can_disable = 1, + } +}; + +static struct regulator *prox_regulator; +static int mop500_prox_activate(struct device *dev); +static void mop500_prox_deactivate(struct device *dev); + +static struct gpio_keys_platform_data mop500_gpio_keys_data = { + .buttons = mop500_gpio_keys, + .nbuttons = ARRAY_SIZE(mop500_gpio_keys), + .enable = mop500_prox_activate, + .disable = mop500_prox_deactivate, +}; + +static struct platform_device mop500_gpio_keys_device = { + .name = "gpio-keys", + .id = 0, + .dev = { + .platform_data = &mop500_gpio_keys_data, + }, +}; + +static int mop500_prox_activate(struct device *dev) +{ + prox_regulator = regulator_get(&mop500_gpio_keys_device.dev, + "vcc"); + if (IS_ERR(prox_regulator)) { + dev_err(&mop500_gpio_keys_device.dev, + "no regulator\n"); + return PTR_ERR(prox_regulator); + } + regulator_enable(prox_regulator); + return 0; +} + +static void mop500_prox_deactivate(struct device *dev) +{ + regulator_disable(prox_regulator); + regulator_put(prox_regulator); +} + +/* add any platform devices here - TODO */ +static struct platform_device *mop500_platform_devs[] __initdata = { + &mop500_gpio_keys_device, + &ab8500_device, +}; + +#ifdef CONFIG_STE_DMA40 +static struct stedma40_chan_cfg ssp0_dma_cfg_rx = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = STEDMA40_PERIPH_TO_MEM, + .src_dev_type = DB8500_DMA_DEV8_SSP0_RX, + .dst_dev_type = STEDMA40_DEV_DST_MEMORY, + .src_info.data_width = STEDMA40_BYTE_WIDTH, + .dst_info.data_width = STEDMA40_BYTE_WIDTH, +}; + +static struct stedma40_chan_cfg ssp0_dma_cfg_tx = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = STEDMA40_MEM_TO_PERIPH, + .src_dev_type = STEDMA40_DEV_SRC_MEMORY, + .dst_dev_type = DB8500_DMA_DEV8_SSP0_TX, + .src_info.data_width = STEDMA40_BYTE_WIDTH, + .dst_info.data_width = STEDMA40_BYTE_WIDTH, +}; +#endif + +static struct pl022_ssp_controller ssp0_platform_data = { + .bus_id = 0, +#ifdef CONFIG_STE_DMA40 + .enable_dma = 1, + .dma_filter = stedma40_filter, + .dma_rx_param = &ssp0_dma_cfg_rx, + .dma_tx_param = &ssp0_dma_cfg_tx, +#else + .enable_dma = 0, +#endif + /* on this platform, gpio 31,142,144,214 & + * 224 are connected as chip selects + */ + .num_chipselect = 5, +}; + +static void __init mop500_spi_init(void) +{ + db8500_add_ssp0(&ssp0_platform_data); +} + +#ifdef CONFIG_STE_DMA40 +static struct stedma40_chan_cfg uart0_dma_cfg_rx = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = STEDMA40_PERIPH_TO_MEM, + .src_dev_type = DB8500_DMA_DEV13_UART0_RX, + .dst_dev_type = STEDMA40_DEV_DST_MEMORY, + .src_info.data_width = STEDMA40_BYTE_WIDTH, + .dst_info.data_width = STEDMA40_BYTE_WIDTH, +}; + +static struct stedma40_chan_cfg uart0_dma_cfg_tx = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = STEDMA40_MEM_TO_PERIPH, + .src_dev_type = STEDMA40_DEV_SRC_MEMORY, + .dst_dev_type = DB8500_DMA_DEV13_UART0_TX, + .src_info.data_width = STEDMA40_BYTE_WIDTH, + .dst_info.data_width = STEDMA40_BYTE_WIDTH, +}; + +static struct stedma40_chan_cfg uart1_dma_cfg_rx = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = STEDMA40_PERIPH_TO_MEM, + .src_dev_type = DB8500_DMA_DEV12_UART1_RX, + .dst_dev_type = STEDMA40_DEV_DST_MEMORY, + .src_info.data_width = STEDMA40_BYTE_WIDTH, + .dst_info.data_width = STEDMA40_BYTE_WIDTH, +}; + +static struct stedma40_chan_cfg uart1_dma_cfg_tx = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = STEDMA40_MEM_TO_PERIPH, + .src_dev_type = STEDMA40_DEV_SRC_MEMORY, + .dst_dev_type = DB8500_DMA_DEV12_UART1_TX, + .src_info.data_width = STEDMA40_BYTE_WIDTH, + .dst_info.data_width = STEDMA40_BYTE_WIDTH, +}; + +static struct stedma40_chan_cfg uart2_dma_cfg_rx = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = STEDMA40_PERIPH_TO_MEM, + .src_dev_type = DB8500_DMA_DEV11_UART2_RX, + .dst_dev_type = STEDMA40_DEV_DST_MEMORY, + .src_info.data_width = STEDMA40_BYTE_WIDTH, + .dst_info.data_width = STEDMA40_BYTE_WIDTH, +}; + +static struct stedma40_chan_cfg uart2_dma_cfg_tx = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = STEDMA40_MEM_TO_PERIPH, + .src_dev_type = STEDMA40_DEV_SRC_MEMORY, + .dst_dev_type = DB8500_DMA_DEV11_UART2_TX, + .src_info.data_width = STEDMA40_BYTE_WIDTH, + .dst_info.data_width = STEDMA40_BYTE_WIDTH, +}; +#endif + + +static pin_cfg_t mop500_pins_uart0[] = { + GPIO0_U0_CTSn | PIN_INPUT_PULLUP, + GPIO1_U0_RTSn | PIN_OUTPUT_HIGH, + GPIO2_U0_RXD | PIN_INPUT_PULLUP, + GPIO3_U0_TXD | PIN_OUTPUT_HIGH, +}; + +#define PRCC_K_SOFTRST_SET 0x18 +#define PRCC_K_SOFTRST_CLEAR 0x1C +static void ux500_uart0_reset(void) +{ + void __iomem *prcc_rst_set, *prcc_rst_clr; + + prcc_rst_set = (void __iomem *)IO_ADDRESS(U8500_CLKRST1_BASE + + PRCC_K_SOFTRST_SET); + prcc_rst_clr = (void __iomem *)IO_ADDRESS(U8500_CLKRST1_BASE + + PRCC_K_SOFTRST_CLEAR); + + /* Activate soft reset PRCC_K_SOFTRST_CLEAR */ + writel((readl(prcc_rst_clr) | 0x1), prcc_rst_clr); + udelay(1); + + /* Release soft reset PRCC_K_SOFTRST_SET */ + writel((readl(prcc_rst_set) | 0x1), prcc_rst_set); + udelay(1); +} + +static void ux500_uart0_init(void) +{ + int ret; + + ret = nmk_config_pins(mop500_pins_uart0, + ARRAY_SIZE(mop500_pins_uart0)); + if (ret < 0) + pr_err("pl011: uart pins_enable failed\n"); +} + +static void ux500_uart0_exit(void) +{ + int ret; + + ret = nmk_config_pins_sleep(mop500_pins_uart0, + ARRAY_SIZE(mop500_pins_uart0)); + if (ret < 0) + pr_err("pl011: uart pins_disable failed\n"); +} + +static struct amba_pl011_data uart0_plat = { +#ifdef CONFIG_STE_DMA40 + .dma_filter = stedma40_filter, + .dma_rx_param = &uart0_dma_cfg_rx, + .dma_tx_param = &uart0_dma_cfg_tx, +#endif + .init = ux500_uart0_init, + .exit = ux500_uart0_exit, + .reset = ux500_uart0_reset, +}; + +static struct amba_pl011_data uart1_plat = { +#ifdef CONFIG_STE_DMA40 + .dma_filter = stedma40_filter, + .dma_rx_param = &uart1_dma_cfg_rx, + .dma_tx_param = &uart1_dma_cfg_tx, +#endif +}; + +static struct amba_pl011_data uart2_plat = { +#ifdef CONFIG_STE_DMA40 + .dma_filter = stedma40_filter, + .dma_rx_param = &uart2_dma_cfg_rx, + .dma_tx_param = &uart2_dma_cfg_tx, +#endif +}; + +static void __init mop500_uart_init(void) +{ + db8500_add_uart0(&uart0_plat); + db8500_add_uart1(&uart1_plat); + db8500_add_uart2(&uart2_plat); +} + +static struct platform_device *snowball_platform_devs[] __initdata = { + &snowball_led_dev, + &snowball_key_dev, + &snowball_sbnet_dev, + &ab8500_device, +}; + +static void __init mop500_init_machine(void) +{ + int i2c0_devs; + + mop500_gpio_keys[0].gpio = GPIO_PROX_SENSOR; + + u8500_init_devices(); + + mop500_pins_init(); + + platform_add_devices(mop500_platform_devs, + ARRAY_SIZE(mop500_platform_devs)); + + mop500_i2c_init(); + mop500_sdi_init(); + mop500_spi_init(); + mop500_uart_init(); + + i2c0_devs = ARRAY_SIZE(mop500_i2c0_devices); + + i2c_register_board_info(0, mop500_i2c0_devices, i2c0_devs); + i2c_register_board_info(2, mop500_i2c2_devices, + ARRAY_SIZE(mop500_i2c2_devices)); + + /* This board has full regulator constraints */ + regulator_has_full_constraints(); +} + +static void __init snowball_init_machine(void) +{ + int i2c0_devs; + + u8500_init_devices(); + + snowball_pins_init(); + + platform_add_devices(snowball_platform_devs, + ARRAY_SIZE(snowball_platform_devs)); + + mop500_i2c_init(); + snowball_sdi_init(); + mop500_spi_init(); + mop500_uart_init(); + + i2c0_devs = ARRAY_SIZE(mop500_i2c0_devices); + i2c_register_board_info(0, mop500_i2c0_devices, i2c0_devs); + i2c_register_board_info(2, mop500_i2c2_devices, + ARRAY_SIZE(mop500_i2c2_devices)); + + /* This board has full regulator constraints */ + regulator_has_full_constraints(); +} + +static void __init hrefv60_init_machine(void) +{ + int i2c0_devs; + + /* + * The HREFv60 board removed a GPIO expander and routed + * all these GPIO pins to the internal GPIO controller + * instead. + */ + mop500_gpio_keys[0].gpio = HREFV60_PROX_SENSE_GPIO; + + u8500_init_devices(); + + hrefv60_pins_init(); + + platform_add_devices(mop500_platform_devs, + ARRAY_SIZE(mop500_platform_devs)); + + mop500_i2c_init(); + hrefv60_sdi_init(); + mop500_spi_init(); + mop500_uart_init(); + + i2c0_devs = ARRAY_SIZE(mop500_i2c0_devices); + + i2c0_devs -= NUM_PRE_V60_I2C0_DEVICES; + + i2c_register_board_info(0, mop500_i2c0_devices, i2c0_devs); + i2c_register_board_info(2, mop500_i2c2_devices, + ARRAY_SIZE(mop500_i2c2_devices)); + + /* This board has full regulator constraints */ + regulator_has_full_constraints(); +} + +static const char * snowball_dt_board_compat[] = { + "calaosystems,snowball-a9500", + NULL +}; + +MACHINE_START(U8500, "ST-Ericsson MOP500 platform") + /* Maintainer: Srinidhi Kasagar <srinidhi.kasagar(a)stericsson.com> */ + .atag_offset = 0x100, + .map_io = u8500_map_io, + .init_irq = ux500_init_irq, + /* we re-use nomadik timer here */ + .timer = &ux500_timer, + .handle_irq = gic_handle_irq, + .init_machine = mop500_init_machine, +MACHINE_END + +MACHINE_START(HREFV60, "ST-Ericsson U8500 Platform HREFv60+") + .atag_offset = 0x100, + .map_io = u8500_map_io, + .init_irq = ux500_init_irq, + .timer = &ux500_timer, + .handle_irq = gic_handle_irq, + .init_machine = hrefv60_init_machine, +MACHINE_END + +DT_MACHINE_START(SNOWBALL, "Calao Systems Snowball platform") + .atag_offset = 0x100, + .map_io = u8500_map_io, + .init_irq = ux500_init_irq, + /* we re-use nomadik timer here */ + .timer = &ux500_timer, + .handle_irq = gic_handle_irq, + .init_machine = snowball_init_machine, + .dt_compat = snowball_dt_board_compat, +MACHINE_END diff --git a/arch/arm/mach-ux500/include/mach/irqs.h b/arch/arm/mach-ux500/include/mach/irqs.h index 9db68d2..11e15d4 100644 --- a/arch/arm/mach-ux500/include/mach/irqs.h +++ b/arch/arm/mach-ux500/include/mach/irqs.h @@ -43,7 +43,7 @@ /* This will be overridden by board-specific irq headers */ #define IRQ_BOARD_END IRQ_BOARD_START -#ifdef CONFIG_MACH_U8500 +#if defined(CONFIG_MACH_U8500) || defined(CONFIG_MACH_MOP500) #include <mach/irqs-board-mop500.h> #endif -- 1.7.5.4

14 years

[ACTIVITY] (John Stultz) Feb 27-Mar 2

by John Stultz

=== Highlights === * My LWN summary of the Android upstreaming interest group meeting from Linaro Connect was published: https://lwn.net/Articles/484196/ * Chased down an issue w/ serial triggered resume from suspend on Pandaboard. Working with PaulW & KevinH to narrow down the issue, as it seems to depend on a combination of uboot, kernel config, and boot options. * Did some initial testing w/ Rafael's wakelock patches using Android. Behavior is not totally what I expect, but some of the Android wakelock code is shifting (early suspend is being dropped) so I'm not sure if I have a ideal match between userland and kernel with which to compare. * Sent out patches to reduce timekeeping lock hold times. Got a bit of feedback from Ingo, which I integrated in. Also did some increased testing which found a few bugs in my new code. Also in testing my work, found and chased down some older timekeeping bugs that had been introduced upstream over the last few years. This took a good chunk of time this week. * Meetings: Ran Android-subteam meeting over email, Phone call with Zach, Lunch with Deepak. * Managed to reproduce an issue I saw earlier in the month with the lowmemory killer in staging. * Some internal items ate most of a day. === Plans === * Continue working with PaulW and KevinH to sort out alarmtiemr work * Need to really get focused on fadvise volatile work === Issues === * NA

14 years

[ACTIVITY] (Linus Walleij) 2012-01-28 - 2012-03-02

by Linus Walleij

== Linus Walleij linusw == === Highlights === * Presented the pin control subsystem at the Embedded Linux Conference in San Francisco. * Discussed pin control at Linaro Connect, discussed pin control at Embedded Linux Conference. Wrote a bunch of patches refactoring the subsystem to be closer to what we agreed, Stephen will do the heavy lifting though. * Wrote and finalized a presentation for the Embedded Systems Conference pertaining to the platform perimeter including GPIO, pin control, device tree ... etc. * Reviewed and merged a whole bunch of patches from Stephen Warren @nVidia who gladly stepped in and offered to write the code we needed to get pin control to where we want it for v3.4. Dong Aishen is doing a great job in helping out with code review here. * Dummy pin controls implemented as default fallback for devices not provided with any controllers. * Sent pinctrl fixes to Torvalds for v3.3-rc4. * Collected a number of ux500 fixes and requested the ARM SoC maintainers to pull them in. Had to back off U9540 support but will reiterate. * Samuel Ortiz merged the DB8500 PRCMU update to the MFD tree. * Wrote mail to Greg & LKML about system controllers after discussion at ARM SoC maintainers summit. Seems the need may be there and we could create drivers/scm the day we have something that would live there. === Plans === * Accumulate pinctrl patches for kernel v3.4 merge window. * Drive generalization of Nomadik GPIO by using the pinctrl framework. drivers/gpio/gpio-nomadik.c * Test the PL08x patches on the Ericsson Research PB11MPCore and submit platform data for using pl08x DMA on that platform. * Look into other Ux500 stuff in need of mainlining... like - Ux500 clocks - the HWMON stuff. === Issues === * Ux500 mainlining or improvements (such as device tree) having second priority. * Sorry for long report covering much time, it's covering some of my vacation that is why... Thanks, Linus Walleij

14 years

[ACTIVITY] (Saugata Das) Feb 27th - March 1

by Saugata Das

== Saugata Das sdas == === Activity Summary === * REQ_META patch submitted to EXT4 and FSDEVEL. Initial feedback is good from the community. Next step is to implement REQ_META on BTRFS. The BP (https://blueprints.launchpad.net/linux-linaro/+spec/emmc4.5-data-tag) is updated === Plans === * Work on native sector BP (https://blueprints.launchpad.net/linux-linaro/+spec/emmc4.5-native-sector) * Work on BP for putting journal on enhanced area (https://blueprints.launchpad.net/linux-linaro/+spec/journal-enhanced-emmc) === Issues === * None

14 years

Replacing Kernel image suspends booting on "Uncompressing Linux... done, booting the kernel"

by Jaeyeon Kihm

Hi guys, Once I duplicated linaro-ubuntu-desktop image into SD card following the instruction on linaro website and it works fine. Now I need to patch the kernel so that I compiled the patched kernel and copy the kernel image into /boot of SD card but my pandaboard doesn't boot up. Below is more detail steps I did so please let me know what I did wrong. Also if you have an instruction, then it also might be really helpful. 1. I'm using PandaBoard ES. To start the board, I just dd linaro-ubuntu-desktop image to SD card following these steps ( http://releases.linaro.org/images/): # These values will change based on your system $ SDCARD=/dev/ #sdcard could be something sdb or mmcblk0 $ IMGFILE=overo-nano.img $ gunzip ${IMGFILE}.gz $ dd bs=64k if=${IMGFILE} of=${SDCARD} Then the linaro ubuntu works on the PandaBoard ES well. In detail, the version of this ubuntu 12.02 and kernel version is 3.1.1-8-linaro-lt-omap. 2. Next, I cloned your git repository(git:// git.kernel.org/pub/scm/linux/kernel/git/ohad/remoteproc.git) to get kernel including remoteproc patch. Since there's no .config file I just copy the config file of 3.2-rc4 on here ( http://elinux.org/Panda_How_to_kernel_3_2_rcx) wihch is the version matching the kernel version on your git repository. And then I compile the kernel and modules to get an uImage and install modules with commands below (also explains http://elinux.org/Panda_How_to_kernel_3_2_rcx), and copy uImage to /boot on SD card and modules /rootfs/lib/ on SD card. I used arm-linux-gnueabi-gcc rather than arm-none-linux-gnueabi-gcc. Then compile like so: make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2010q1/bin/arm-none-linux-gnueabi- uImage Then compile the modules like so: make ARCH=arm CROSS_COMPILE=/home/kenm/Panda/arm-2010q1/bin/arm-none-linux-gnueabi- modules "Install" the modules to somewhere convenient: make ARCH=arm CROSS_COMPILE=/home/kenm/Panda/arm-2010q1/bin/arm-none-linux-gnueabi- INSTALL_MOD_PATH=../testlib_omap modules_install 3. Then I put SD card to the Panda Board but it's suspending with the booting logs below. U-Boot SPL 2011.12-rc1 (Mar 01 2012 - 20:03:59) Texas Instruments OMAP4460 ES1.1 OMAP SD/MMC: 0 reading u-boot.img reading u-boot.img U-Boot 2011.12-rc1 (Mar 01 2012 - 20:03:59) CPU : OMAP4460 ES1.1 Board: OMAP4 Panda I2C: ready DRAM: 1 GiB WARNING: Caches not enabled MMC: OMAP SD/MMC: 0 Using default environment In: serial Out: serial Err: serial Net: No ethernet found. Hit any key to stop autoboot: 0 reading uEnv.txt ** Unable to read "uEnv.txt" from mmc 0:1 ** reading boot.scr 514 bytes read Loaded script from boot.scr Running bootscript from mmc0 ... ## Executing script at 82000000 reading uImage 3249584 bytes read reading uInitrd 1877535 bytes read reading board.dtb 340 bytes read ## Booting kernel from Legacy Image at 80200000 ... Image Name: Linux-3.2.0-rc4-00248-gb835c0f-d Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 3249520 Bytes = 3.1 MiB Load Address: 80008000 Entry Point: 80008000 Verifying Checksum ... OK ## Loading init Ramdisk from Legacy Image at 81600000 ... Image Name: initramfs Image Type: ARM Linux RAMDisk Image (uncompressed) Data Size: 1877471 Bytes = 1.8 MiB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK ## Flattened Device Tree blob at 815f0000 Booting using the fdt blob at 0x815f0000 Loading Kernel Image ... OK OK reserving fdt memory region: addr=9d000000 size=3000000 Using Device Tree in place at 815f0000, end 815f3153 Starting kernel ... Uncompressing Linux... done, booting the kernel. Do you have any guess what I have missed or didn't do something? Any of your advise would be more than welcome. Thanks for your patches, and I really appreciate your consideration and help. Thanks, Jaeyeon

14 years

[ACTIVITY] (Dong Aisheng) Feb 20 - Feb 29

by Dong Aisheng

=== Pinctrl === * Mainly focused on help reviewing pinctrl core rework patches(near 30 patches recently submitted by Stephen Warren and Linus Walleij) for API rework, merging mux and config and adding different state support as well as pinctrl core dt binding support(in plan). === Plan === * Continue to help review pinctrl core patches since many of them are still not hit mainline * Adding pin config and DT support for MX6Q pinctrl driver after pinctrl core rework patches get upstreamed * Will spend some free time to add DT support for MX28 platform

14 years

Sample big.LITTLE model boot images

by Dave Martin

Hi all, I've added some detailed info on the wiki about how to go about building bootable images for the big.LITTLE components, here: https://wiki.linaro.org/Internal/Projects/Big.Little.Switcher/ARMFastModels… For the benefit of anyone who can't see that page, I've also pasted it here -- if anyone knows a better place to post this stuff, please let me know! Note that although the instructions give details of how to build a filesystem image, there is essentially nothing b.L or model-specific there -- it just serves as background for explaining how to work around some issues which you may encounter. These images are not supposed to present a fully working big.LITTLE system -- they are there to help people understand how booting works, where the sources are and how to work with the model. Note also that the bootwrapper will change soon (when I get there) to support loading of the kernel, initramfs from the host filesystem using semihosting, just like the kvm bootwrapper, but this isn't implemented for now. Cheers ---Dave == Filesystem == We need to create an SD card image with a filesystem on it, with the rootfs partition matching the bootargs set previously. The following example generates a suitable image using developer. The hardware pack is largely irrelevant because we're not getting the kernel, modules, bootloader or command-line from there -- but it keeps l-m-c happy. {{{ $ wget http://releases.linaro.org/12.02/ubuntu/oneiric-images/developer/linaro-o-d… $ wget http://releases.linaro.org/12.02/ubuntu/oneiric-images/developer/hwpack_lin… }}} Note that the ARM fast model's MMC interface emulation is currently limited to 2G. Make the image a bit smaller than that to be on the safe side: {{{ $ sudo linaro-media-create --dev vexpress --image_file mmc.bin --image_size 2000M --hwpack hwpack_linaro-lt-vexpress-a9_20120221-1_armel_suupported.tar.gz --binary linaro-o-developer-tar-20120221-0.tar.gz }}} After generating the filesystem, you probably want to customize it: * Disable address layout randomization (mitigates a memory consumption issue with the model, but not so important on host machines with >4GB of RAM): {{{ echo sys.kernel.randomize_va_space = 0 >>etc/sysctl.conf }}} * Disable DHCP for the network (otherwise boot will stall): {{{ sed -i '/auto.*eth0/d; s/^$iface.*eth0.*$dhcp/\1manual/' etc/network/interfaces }}} * Edit fstab to put the real device name into /etc/fstab in place of UUID=<uuid>. This may not be necessary (mountall was getting confused, but that may have been caused by not having an initramfs). Finally, extract the initramfs image (whatever /initrd.img in the filesystem image points to). == Kernel, switcher and bootwrapper == Clone the big.LITTLE switcher: {{{ $ git clone --branch gnu-build git://git.linaro.org/people/dmart/arm-virt-bl.git }}} Clone the kernel to run on the model. (Eventually we shouldn't need a special tree for this. There are a few model-specific tweaks in this tree, but nothing big.LITTLE-specific yet.) {{{ $ git clone --branch arm/vexpressdt-rtsm git://git.linaro.org/people/dmart/linux-2.6-arm.git }}} Now build the kernel: {{{ $ cd linux-2.6-arm/ $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- vexpress_rtsm_defconfig $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- zImage dtbs }}} The bootwrapper doesn't support device tree yet, so for now append a suitable device tree blob to the zImage. This should match the model you intend to run on: {{{ $ cat arch/arm/boot/zImage arch/arm/boot/vexprress-v2p-ca15x4-rtsm.dtb >../zBlob }}} Now, build the bootwrapper using the kernel you just built: {{{ $ cd ../arm-virt-bl/bootwrapper }}} Configure some things: In Makefile, add the following argument to BOOTARGS: {{{ root=/dev/mmcblk0p2 }}} Due to current bugginess introduced by the ARM->GNU toolchain migration, the switcher is not currently stable. For now, we turn off autonomous asynchronous switching so that we can see the system booting: In big-little/Makefile, add change the line {{{ ASYNC ?= TRUE }}} to {{{ ASYNC ?= FALSE }}} Plug in the kernel and initramfs images from the previous steps: {{{ $ : >payload/fsimg $ cp ../../zBlob payload/kernel $ cp initrd.img payload/fsimg }}} ... and build: {{{ $ make [...] LD img.axf }}} img.axf is the boot payload which is needed to start the model. It contains the big.LITTLE switcher code and the kernel, along with a minimal bootloader. == Running == OK, so now we have: * A boot image containing the switcher and kernel: img.axf * A filesystem MMC card image: mmc.bin * A model binary Sample payload images can be found in http://people.linaro.org/~dmart/bl-images/model-images-20120228.tar.bz2 Run like this: {{{ $ ./RTSM_VE_Cortex-A15x4-A7x4 -C motherboard.mmc.p_mmc_file=mmc.bin -a coretile.cluster0.*=img.axf }}} This should be enough to boot to a prompt on the simulated UART. Beware though -- it can take up to 10 minutes or so to get there, depending on your machine.

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