linaro-dev May 2011

linaro-dev@lists.linaro.org

122 participants
116 discussions

build error with latest linux-linaro-2.6.38

by John Rigby

Hi Nicolas, make omap2plus_defconfig then edit .config and remove CONFIG_ARCH_OMAP2=y line then make oldconfig and turn on CONFIG_THUMB2_KERNEL then make uImage LD vmlinux SYSMAP System.map SYSMAP .tmp_System.map OBJCOPY arch/arm/boot/Image Kernel: arch/arm/boot/Image is ready AS arch/arm/boot/compressed/head.o GZIP arch/arm/boot/compressed/piggy.gzip CC arch/arm/boot/compressed/misc.o CC arch/arm/boot/compressed/decompress.o arch/arm/boot/compressed/head.S: Assembler messages: arch/arm/boot/compressed/head.S:232: Error: r15 not allowed here -- `cmp r10,pc' make[2]: *** [arch/arm/boot/compressed/head.o] Error 1 make[2]: *** Waiting for unfinished jobs.... make[1]: *** [arch/arm/boot/compressed/vmlinux] Error 2 make: *** [uImage] Error 2 -- john

12 years, 11 months

Fedora armv7hl bringup

by Jon Masters

Hello everyone, In the spirit of reaching out to the Linaro community, I'd like to engage in some conversation with those working on the HardFP ABI switch and toolchain effort, since we will shortly be doing the same in the Fedora ARM community. The intention is to support hardfp in time for the Fedora 15 ARM release, which *will* lag behind the x86 F-15 release. Anyway. I could do with some pointers to the current state of things, and who I should talk to and engage with at the LDS in another week. I will be there representing the Fedora ARM community. And I look forward to meeting those of you who don't already know me from other lives ;) Jon.

12 years, 11 months

what new CONFIG_s need to be enabled

by John Rigby

Nicolas, Andy, I see that Andy's stuff went into linux-linaro-2.6.38 earlier. What new CONFIG_'s do I need to turn on in the packaged kernel to ensure we get all the fabulous new stuff enabled? Thanks, John

12 years, 12 months

Notes & Actions: Linaro Graphics Working Group - Apr 27, 2011

by Alexandros Frantzis

Hi, notes and actions from our Wednesday graphics working group call are available on the wiki: + https://wiki.linaro.org/WorkingGroups/Middleware/Graphics/Notes/2011-04-27 Details about when and where of this meeting can be found here: + https://wiki.linaro.org/WorkingGroups/Middleware/Graphics#Weekly%20Public%2… Summary ======= * LDS demo poster finalized. * kwin * Packages done and available for ARM platforms. * Tested on imx51 (\o/), to be tested on pandaboard. * chromium-wm: build/packaging has begun. * Furious preparation for memory management mini-summit. * nux: cairo-gles work being leveraged for dispatch method and texture wrap solution. * GLEW-gles published on git.linaro.org and out for review. Thanks, -- - Alexandros

12 years, 12 months

[PATCH android/device/linaro/pandaboard] vold.fstab: Change the sys path for mmc device

by Jeremy Chang

After kernel bumped to 2.6.38.3, mmc sys path changed Signed-off-by: Jeremy Chang <jeremy.chang(a)linaro.org> --- vold.fstab | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/vold.fstab b/vold.fstab index 04b9690..10fe0c4 100644 --- a/vold.fstab +++ b/vold.fstab @@ -12,4 +12,4 @@ ## <sysfs_path> - List of sysfs paths to source devices ###################### -dev_mount sdcard /mnt/sdcard 6 /devices/platform/mmci-omap-hs.0/mmc_host/mmc0 +dev_mount sdcard /mnt/sdcard 6 /devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0 -- 1.7.1

12 years, 12 months

zlib NEON improvements

by Michael Hope

Jan Seiffert has been looking into vectorising the adler32 routine in zlib. On the A9 there's a 3.0 x improvement to be had on blocks that fit in the L1 cache and a 2.1 x improvement for larger blocks. See: http://mail.madler.net/pipermail/zlib-devel_madler.net/2011-May/002556.html for the work in progress. -- Michael ---------- Forwarded message ---------- From: Michael Hope <michael.hope(a)linaro.org> Date: Mon, May 2, 2011 at 10:35 AM Subject: Re: [Zlib-devel] [3/8][RFC V3 Patch] Add special ARM Adler32 version To: zlib-devel(a)madler.net On Mon, May 2, 2011 at 9:48 AM, Jan Seiffert <kaffeemonster(a)googlemail.com> wrote: > 2011/4/24 Jan Seiffert <kaffeemonster(a)googlemail.com>: >> This adds an NEON version, a iWMMXt version for Intel (now Marvel) >> StrongARM and a version for ARMv6 DSP instructions of Adler32. >> > > Thanks again to Edwin Török the NEON and ARMv6 DSP version are now > tested and fixed. > > The good news is NEON: > an i.MX515@800MHz (arm7l) with NEON > -------- orig ------ > a: 0x0CB4B676, 10000 * 160000 bytes t: 4010 ms > a: 0x25BEB273, 10000 * 159999 bytes t: 2990 ms > a: 0x733CB174, 10000 * 159998 bytes t: 4060 ms > a: 0x1144AF76, 10000 * 159996 bytes t: 4050 ms > a: 0x3F4ECB8A, 10000 * 159992 bytes t: 4060 ms > a: 0x1902A382, 10000 * 159984 bytes t: 4060 ms > -------- vec ------ > a: 0x0CB4B676, 10000 * 160000 bytes t: 1450 ms > a: 0x25BEB273, 10000 * 159999 bytes t: 1450 ms > a: 0x733CB174, 10000 * 159998 bytes t: 1460 ms > a: 0x1144AF76, 10000 * 159996 bytes t: 1450 ms > a: 0x3F4ECB8A, 10000 * 159992 bytes t: 1460 ms > a: 0x1902A382, 10000 * 159984 bytes t: 1450 ms > speedup: 2.765517 Hi Jan. I see similar numbers. I wasn't sure what you were using to benchmark this so I wrote my own little stub that did the seed=0x0CB4B676 version over data from rand(). I ran each test five times and picked the lowest user time as the best. All were built with gcc-linaro-4.5-2011.04 with -mfpu=neon -mtune=cortex-a9. The results were: Cortex-A9 @ 1 GHz: Plain C: 4.094 s ARMv6: 4.578 s NEON: 1.985 s Cortex-A8 @ 720 MHz: Plain C: 4.164 s NEON: 1.819 s NEON: 1.570 s (with -mtune=cortex-a8) It's interesting how the slower A8 does better than the A9. It's probably due to the A8 having wider access to the L2 cache as running the same test but on 16 k of data so that it fits in the L1 cache gives: Cortex-A8: 5.234 s Cortex-A9: 3.969 s The ratio here is 0.760 which is very similar to the ratio between the clock frequencies. -- Michael

12 years, 12 months

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linaro-dev May 2011