[Buildroot] u-boot compiler issue

[Buildroot] u-boot compiler issue

[Yegor Yefremov]

Hello,

I was building u-boot with buildroots created toolchain. Everything was working except that pointer passed via r8 was not writable (RAM was not configured etc.). But if the same code was compiled with CodeSourcery everything was working. Here gcc configuration from buidroot:

Using built-in specs.
COLLECT_GCC=arm-linux-gcc
COLLECT_LTO_WRAPPER=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr/libexec/gcc/arm-unknown-linux-uclibcgnueabi/4.5.2/lto-wrapper
Target: arm-unknown-linux-uclibcgnueabi
Configured with: /home/YegorYefremov/projects/versioned/tests/buildroot/output/toolchain/gcc-4.5.2/configure --prefix=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=arm-unknown-linux-uclibcgnueabi --enable-languages=c,c++ --with-sysroot=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr/arm-unknown-linux-uclibcgnueabi/sysroot --with-build-time-tools=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr/arm-unknown-linux-uclibcgnueabi/bin --disable-__cxa_atexit --enable-target-optspace --with-gnu-ld --disable-libssp --disable-multilib --disable-tls --enable-shared --with-gmp=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr --with-mpfr=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr --with-mpc=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr --disable-nls --enable-threads --disa
ble-decimal-float --with-float=soft --with-abi=aapcs-linux --with-arch=armv7-a --with-tune=cortex-a8 --with-pkgversion='Buildroot 2011.05-git-00157-gf4c06f4-dirty' --with-bugurl=http://bugs.buildroot.net/
Thread model: posix
gcc version 4.5.2 (Buildroot 2011.05-git-00157-gf4c06f4-dirty)

here CodeSourcery:

Using built-in specs.
Target: arm-none-linux-gnueabi
Configured with: /scratch/mitchell/builds/4.3-arm-none-linux-gnueabi-respin/src/gcc-4.3/configure --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --target=arm-none-linux-gnueabi --enable-threads --disable-libmudflap --disable-libssp --disable-libstdcxx-pch --with-gnu-as --with-gnu-ld --with-specs='%{funwind-tables|fno-unwind-tables|mabi=*|ffreestanding|nostdlib:;:-funwind-tables}' --enable-languages=c,c++ --enable-shared --enable-symvers=gnu --enable-__cxa_atexit --with-pkgversion='Sourcery G++ Lite 2009q1-203' --with-bugurl=https://support.codesourcery.com/GNUToolchain/ --disable-nls --prefix=/opt/codesourcery --with-sysroot=/opt/codesourcery/arm-none-linux-gnueabi/libc --with-build-sysroot=/scratch/mitchell/builds/4.3-arm-none-linux-gnueabi-respin/lite/install/arm-none-linux-gnueabi/libc --with-gmp=/scratch/mitchell/builds/4.3-arm-none-linux-gnueabi-respin/lite/obj/host-libs-2009q1-203-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr --with-mpfr=/scratch/mitchell/builds/4.3
-arm-none-linux-gnueabi-respin/lite/obj/host-libs-2009q1-203-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr --disable-libgomp --enable-poison-system-directories --with-build-time-tools=/scratch/mitchell/builds/4.3-arm-none-linux-gnueabi-respin/lite/install/arm-none-linux-gnueabi/bin --with-build-time-tools=/scratch/mitchell/builds/4.3-arm-none-linux-gnueabi-respin/lite/install/arm-none-linux-gnueabi/bin
Thread model: posix
gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203)

My buildroot .config is also attached.

How should I configure the toolchain to able to compile OMAP3 u-boot?

Best regards,
Yegor
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[Buildroot] u-boot compiler issue

[Thomas Petazzoni]

Hello,

On Thu, 12 May 2011 16:17:55 +0200
Yegor Yefremov <yegor_sub1@visionsystems.de> wrote:

> I was building u-boot with buildroots created toolchain. Everything was working except
> that pointer passed via r8 was not writable (RAM was not configured
> etc.).

Could you give more details about this analysis ?

> But if the same code was compiled with CodeSourcery everything
> was working. Here gcc configuration from buidroot:

Does the U-Boot compilation fails, or the compilation works but U-Boot
fails to run on the device ? If it's the latter, then which version of
U-Boot are you using ? Only recent versions of U-Boot work well with
gcc 4.5.

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[Buildroot] u-boot compiler issue

[Yegor Yefremov]

>> I was building u-boot with buildroots created toolchain. Everything was working except
>> that pointer passed via r8 was not writable (RAM was not configured
>> etc.).
> Could you give more details about this analysis ?

#define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r8")

in file arch/arm/cpu/arm_cortexa8/omap3/emif4.c:

int dram_init(void)
{
        DECLARE_GLOBAL_DATA_PTR;
        unsigned int size0 = 0, size1 = 0;

        size0 = get_sdr_cs_size(CS0);

        /*
         * If a second bank of DDR is attached to CS1 this is
         * where it can be started.  Early init code will init
         * memory on CS0.
         */
        if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED))
                size1 = get_sdr_cs_size(CS1);

        gd->bd->bi_dram[0].start = PHYS_SDRAM_1;

        gd->bd->bi_dram[0].size = size0;  <----- this assignment has no effect, afterwards the size is 0

        gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
        gd->bd->bi_dram[1].size = size1;

        return 0;
}

with CodeSourcery 's compiler the size will be correctly assigned.

>> But if the same code was compiled with CodeSourcery everything
>> was working. Here gcc configuration from buidroot:
> Does the U-Boot compilation fails, or the compilation works but U-Boot
> fails to run on the device ? If it's the latter, then which version of
> U-Boot are you using ? Only recent versions of U-Boot work well with
> gcc 4.5.

This is u-boot 2010.06 from ARAGO project (http://arago-project.org/wiki/index.php/Main_Page). Git tree:
http://arago-project.org/git/projects/?p=u-boot-omap3.git;a=summary

U-Boot compiles correctly in the sense that I get u-boot.bin and it also runs: I get command prompt and can execute various commands. The only things that fail are those that require RAM address and size like bootm and so on.

I hope this info will help.

P.S. I've got a hint that enabling __cxa_atexit would possibly solve the problem. So I added this setting to the toolchain, but it didn't help.

COLLECT_GCC=arm-linux-gcc
COLLECT_LTO_WRAPPER=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr/libexec/gcc/arm-unknown-linux-uclibcgnueabi/4.5.2/lto-wrapper
Target: arm-unknown-linux-uclibcgnueabi
Configured with: /home/YegorYefremov/projects/versioned/tests/buildroot/output/toolchain/gcc-4.5.2/configure --prefix=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=arm-unknown-linux-uclibcgnueabi --enable-languages=c,c++ --with-sysroot=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr/arm-unknown-linux-uclibcgnueabi/sysroot --with-build-time-tools=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr/arm-unknown-linux-uclibcgnueabi/bin --disable-__cxa_atexit --enable-target-optspace --with-gnu-ld --disable-libssp --disable-multilib --disable-tls --enable-shared --with-gmp=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr --with-mpfr=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr --with-mpc=/home/YegorYefremov/projects/versioned/tests/buildroot/output/host/usr --disable-nls --enable-threads
--disable-decimal-float --with-float=soft --with-abi=aapcs-linux --with-arch=armv7-a --with-tune=cortex-a8 --enable-__cxa_atexit --with-pkgversion='Buildroot 2011.05-git-00157-gf4c06f4-dirty' --with-bugurl=http://bugs.buildroot.net/
Thread model: posix
gcc version 4.5.2 (Buildroot 2011.05-git-00157-gf4c06f4-dirty)

--disable-__cxa_atexit

--disable-__cxa_atexit