linaro-toolchain

linaro-toolchain@lists.linaro.org

6 participants
5799 discussions

by Renato Golin

Hi Folks, I'm running two buildbots here at home and am getting consistent failures from the Pandas because of overheating. I've set up a monitor that will tell me the current CPU temperature and the allowed maximum, and when the bot passes 90%, it shuts itself off. The problem is that I'm running with heat-sinks and the boards are on top of three fans, so there really isn't much more I can do to solve this problem. I personally think this is a hardware problem, since everything is in the same die, CPU, GPU and RAM, and the physical dimensions of the chip are quite small. I remember when Intel started overheating (around 486DX66) and the die was huge (more head dissipation), plus RAM and GPU were separate, and it still needed a hefty heat-sink. It's true that gates are far smaller today, but it's not true that a dual core 1.3GHz + GPU + RAM will produce less heat on a small die than a 66KHz CPU on a huge die, so why anyone think it's a good idea to release a 1+GHz chip without *any* form of heat dissipation is beyond my comprehension. Manufacturers only got away with it, so far, because people rarely use 100% of the CPU power for extended periods of time, because ARM devices end up as set-top boxes, mobile phones and tablets. However, even those devices will heat up when playing 2 h films or games, and they do have some form of heat sink. We, at the toolchain group, make things worse by using 100% CPU, 24 / 7, something that Panda boards, or Arndales were not designed to do. However, with ARM moving into the server space, their designs will have to be re-thought, and what a better place than Linaro for making sure we get it right? For the time being, I believe we *must* have air conditioning in the Lab all the time, and we *must* have heat-sinks on every board, and we *must* monitor the CPU temperature of the boards, at least until we're comfortable that they're not failing all the time. Can we make a temperature monitor (like the one attached) a default feature on Linaro Ubuntu distributions? We could dump that info to the syslog/dmesg whenever it crosses the (say) 75% threshold, and report more often when it crosses the 95%, possibly dumping the processe(s) that are consuming more CPU at the time, to enable post-mortem debugging. cheers, --renato As a side note, the quad-A9 ODroid does ship with a massive heat-sink, which also serves as a fancy case. Quite clever, really.

13 years, 2 months

[SPAM] $99 A9 desktop

by Renato Golin

http://arstechnica.com/information-technology/2013/07/99-arm-based-pc-runs-… + Quad-core-A9 @ 1.2GHz + 4GB RAM + 512GB SDD + 2 x GBit Ethernet + <8W total power http://utilite-computer.com/web/utilite-specifications The complete system will be a lot more than $99, but still, I don't think it'll be more than $500. Maybe, this will be more stable than Panda boards for toolchain testing? cheers, --renato

13 years, 2 months

How to make gcc generate optimized code for statically linked TLS

by Vitali Sokhin

Hello, I use gcc-linaro-aarch64-linux-gnu-4.8 to compile my C code with thread-local variables. Here is an example of my C code: __thread u32 threadedVar; void test(void) { threadedVar = 0xDEAD; } gcc produces the following assembly to access my threaded variable: threadedVar = 0xDEAD; 72b0: d00000c0 adrp x0, 21000 72b4: f945ac00 ldr x0, [x0,#2904] 72b8: d503201f nop 72bc: d503201f nop 72c0: d53bd041 mrs x1, tpidr_el0 72c4: 529bd5a2 movz w2, #0xdead 72c8: b8206822 str w2, [x1,x0] This assembly fits dynamically linked code, but in my case I have statically linked application that does not load any additional modules. Since I have exactly one TLS block containing all thread-local variable gcc should be able to calculate the offset at link time. Can I make gcc to produce the following assembly ? threadedVar = 0xDEAD; 72c0: d53bd041 mrs x1, tpidr_el0 72c4: 529bd5a2 movz w2, #0xdead 72c8: b8206822 str w2, [x1,#offset_to_threadedVar] Thank you, Vitali

13 years, 2 months

How to make gcc generate optimized code for statically linked TLS

by Vitali Sokhin

13 years, 2 months

[ANNOUNCE] Linaro GCC 4.8 and 4.7 2013.07 released

by Christophe Lyon

The Linaro Toolchain Working Group is pleased to announce the release of both Linaro GCC 4.8 and Linaro GCC 4.7. Linaro GCC 4.8 2013.07 is the fourth release in the 4.8 series. Based off the latest GCC 4.8.0+svn200355 release, it includes performance improvements and bug fixes. Interesting changes include: * Updates to GCC 4.8.0+svn200355 * Address Sanitizer support for ARM. * New -mrestrict-it option support. * Backport of support for further AArch64 instructions. * Backport of support for further ARMv8 AArch32 instructions. * Reverted recent changes to shrink-wrapping and tail-calls. Linaro GCC 4.7-2013.07 is the sixteenth release in the 4.7 series. Based off the latest GCC 4.7.3+svn200408 release, this is the third release after entering maintenance. Interesting changes include: * Updates to GCC 4.7.3+svn200408 The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.7-2013.07 https://launchpad.net/gcc-linaro/+milestone/4.8-2013.07 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro Mailing list: http://lists.linaro.org/mailman/listinfo/linaro-toolchain Bugs: https://bugs.launchpad.net/gcc-linaro/ Questions? http://ask.linaro.org/ Interested in commercial support? inquire at support(a)linaro.org

13 years, 2 months

Fwd: Please help: Linaro GDB 7.6-2013.05 Issue

by 常桓

Hi Linaro toolchain team, I compiled linaro-toolchain 2013.06 by myself on fedora 18 x86_64, everything works fine except GDB. The error message is "Im sorry, Dave, I can't do that. Symbol format `elf32-littlearm' unknown'." I searched on google, and leads me to the page https://bugs.launchpad.net/linaro-toolchain-binaries/+bug/918937 I configured linaro-toolchain to build a native gdb for arm platform, both native gdb and cross-gdb can't work, they report the same error message. Is there any way I can get the patch? Please help me on this! Thank you very much! Yupeng Chang July 05, 2013

13 years, 2 months

Re: Please help: Linaro GDB 7.6-2013.05 Issue

by 常桓

Hi Michael, I have fixed this issue. I think there is a bug in crosstool-ng-1.13.1-2013.06. In crosstool-ng-1.13.1-2013.06/contrib/linaro/patches/gdb/linaro-7.6-2013.05, there is a patch libintl-as-lib.patch, which adds -lintl to LDFLAGS of gdb, however, in the 300-gdb.sh, --without-included-gettext is used, this option makes libintl inside gdb quit building, in this case, when checking ELF support in BFD, -lintl cannot be found, this leads to fail. In eglibc-2.17, intl lib is included in libc, --without-included-gettext is reasonable to apply to gdb, which means libintl-as-lib.patch is no longer needed, because this patch adds an option which will be no longer needed for building gdb with eglibc-2.17 After I removed the patch, every thing works fine now, in gdb/config.log, checking ELF support in BFD reports OK now. Yupeng Chang July 06 2013 On 6 July 2013 03:21, Michael Hope <michaelh(a)juju.net.nz> wrote: > Hi there. I'm afraid I'm not working on gdb these days but it sounds like > a configuration error. I suggest asking on > linaro-toolchain(a)lists.linaro.org as they should be able to help. > > -- Michael > On Jul 5, 2013 8:03 PM, "常桓" <changyp6(a)gmail.com> wrote: > >> Hi Michael, >> Sorry for bothering you about a GDB issue. >> I compiled linaro-toolchain 2013.06 by myself on fedora 18 x86_64, >> everything works fine except GDB. >> The error message is "Im sorry, Dave, I can't do that. Symbol format >> `elf32-littlearm' unknown'." >> I searched on google, and leads me to the page >> https://bugs.launchpad.net/linaro-toolchain-binaries/+bug/918937 >> >> On that page, you posted this is fixed, could you show me the fix? >> >> I configured linaro-toolchain to build a native gdb for arm platform, >> both native gdb and cross-gdb can't work, they report the same error >> message. >> >> Please help me on this! >> >> Thank you very much! >> >> Yupeng Chang >> July 05, 2013 >> >> >> >>

13 years, 2 months

[ACTIVITY] 1-5 July 2013

by Christophe Lyon

== Progress == * 2013.07 release preparation: * remaining backports * reverted 2 sets of patches from 2013.06 * started release process * Worked on setting up an internal build + validation to monitor FSF trunk on ARM * Internal support == Next == * All week at Connect

13 years, 2 months

[ACTIVITY] Week 27

by Will Newton

== Progress == * 4 day week (leave on Thursday) * Pushed memcpy improvement to newlib. * Found and fixed ARM IFUNC issue in glibc. * memcpy merged into bionic but not yet used (see gerrit review). * Pinged and applied gdb testsuite patch, only one left to apply. * More work on malloc benchmarking. * Preparation for Connect. == Issues == * None. == Plan == * Connect all week -- Will Newton Toolchain Working Group, Linaro

13 years, 2 months

[ACTIVITY] Week 27

by Renato Golin

== Progress == * Buildbots - Prepared buildbot images, tested, setup is very quick and efficient - Set up local buildmaster, two buildslaves doing self-hosting tests - Each slave took 20 minutes setup time, including flashing SDCard - Failures after a few hours running at 100% @ 1.2GHz @ < 26C - Reducing to 920MHz does fix the problem, but this is not a solution - Leaving the two pandas alive during Connect in hope they won't fail * LNT Lencod - Following up on Lencod stack corruption, we're closer to a solution * Dibmod - Didn't have much time to look at it properly, but my solution was over simplified - Will probably only look at it better after Connect * Chromebook - Had to re-install Ubuntu on it, using Raring (Saucy didn't work) - Glad all my data is in the external hard-drive * Others - Added a doc about platform-specific tests that usually break the bots http://llvm.org/docs/TestingGuide.html#platform-specific-tests - LLVMLinux meeting, cross-compilation with Clang is almost impossible - Haven't been able to review many patches, thanks to Tim, they kept going! == Plan == * Connect whole next week == After Connect == * Finish implementation AEABI divmod/udivmod calls * Check why Phoronix result pages are not working * Put self-hosting bots back on 920MHz mode in the Lab

13 years, 2 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

linaro-toolchain