Dear All,
I am using arch/arm/configs/vexpress_defconfig to configure and build Linux Kernel 3.1.1 http://launchpad.net/linux-linaro/3.1/3.1-2011.11/+download/linux-linaro-3.1... and then if I booth the zImage crated on Linaro QEMU http://launchpad.net/qemu-linaro/trunk/2011.10/+download/qemu-linaro-0.15.50... ,it works properly.
But if i enable the LPAE support in the config file, the kernel builds and when I boot the kernel image on QEMU, it just prints the output as :
Uncompressing Linux... done, booting the kernel.
And, then it hangs ... Can anyone please tell how to fix this issue?
Looking forward to your reply.
Thanks and Regards,
Jubi
On 22 November 2011 13:06, Jubi Taneja jubitaneja@gmail.com wrote:
I am using arch/arm/configs/vexpress_defconfig to configure and build Linux Kernel 3.1.1 http://launchpad.net/linux-linaro/3.1/3.1-2011.11/+download/linux-linaro-3.1... and then if I booth the zImage crated on Linaro QEMU http://launchpad.net/qemu-linaro/trunk/2011.10/+download/qemu-linaro-0.15.50... ,it works properly.
But if i enable the LPAE support in the config file, the kernel builds and when I boot the kernel image on QEMU, it just prints the output as :
Uncompressing Linux... done, booting the kernel.
Does your kernel boot OK on real hardware?
(ie, is a kernel with LPAE support expected to boot on a CPU like the A9 which doesn't have LPAE?)
Also if your config/kernel command line don't turn on earlyprintk it's worth enabling this as it usually gets you better diagnostic messages for early kernel boot failures.
-- PMM
On Tue, Nov 22, 2011 at 01:14:51PM +0000, Peter Maydell wrote:
On 22 November 2011 13:06, Jubi Taneja jubitaneja@gmail.com wrote:
I am using arch/arm/configs/vexpress_defconfig to configure and build Linux Kernel 3.1.1 http://launchpad.net/linux-linaro/3.1/3.1-2011.11/+download/linux-linaro-3.1... and then if I booth the zImage crated on Linaro QEMU http://launchpad.net/qemu-linaro/trunk/2011.10/+download/qemu-linaro-0.15.50... ,it works properly.
But if i enable the LPAE support in the config file, the kernel builds and when I boot the kernel image on QEMU, it just prints the output as :
Uncompressing Linux... done, booting the kernel.
Does your kernel boot OK on real hardware?
(ie, is a kernel with LPAE support expected to boot on a CPU like the A9 which doesn't have LPAE?)
No, that will not work for the foreseeable future. Building two pagetable models into a single kernel would likely be highly contraversial, given Linus' views about LPAE-type platforms and HIGHMEM.
Conversely, a kernel without LPAE turned on will work on A15 (provided you enable the A15 CPU support in the kernel). But naturally, you will only see the log 4GB of physical address space.
Cheers ---Dave
On Tue, Nov 22, 2011 at 7:39 PM, Dave Martin dave.martin@linaro.org wrote:
On Tue, Nov 22, 2011 at 01:14:51PM +0000, Peter Maydell wrote:
On 22 November 2011 13:06, Jubi Taneja jubitaneja@gmail.com wrote:
I am using arch/arm/configs/vexpress_defconfig to configure and build
Linux
Kernel 3.1.1
http://launchpad.net/linux-linaro/3.1/3.1-2011.11/+download/linux-linaro-3.1...
and then if I booth the zImage crated on Linaro QEMU
http://launchpad.net/qemu-linaro/trunk/2011.10/+download/qemu-linaro-0.15.50...
,it works properly.
But if i enable the LPAE support in the config file, the kernel builds
and
when I boot the kernel image on QEMU, it just prints the output as :
Uncompressing Linux... done, booting the kernel.
Does your kernel boot OK on real hardware?
(ie, is a kernel with LPAE support expected to boot on a CPU like the A9 which doesn't have LPAE?)
No, that will not work for the foreseeable future. Building two pagetable models into a single kernel would likely be highly contraversial, given Linus' views about LPAE-type platforms and HIGHMEM.
Conversely, a kernel without LPAE turned on will work on A15 (provided you enable the A15 CPU support in the kernel). But naturally, you will only see the log 4GB of physical address space.
Thanks a lot for the information.
Cheers ---Dave
linaro-toolchain@lists.linaro.org
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Dave Martin -
Jubi Taneja -
Peter Maydell