我正在使用Buildroot 2020.02.1构建用于安装AMD GX-222GC SOC的PC的自定义内核。
默认的外部工具链是CodeBench的amd-2016.11-19。使用该工具链构建的内核可以正确引导。相反，如果我使用buildroot自动构建的工具链来构建相同的内核，相同的配置，则该内核不会启动！甚至没有内核死机，机器只是复位。
很明显，问题与工具链有关。
这些是gcc -v的结果
CodeBench：
$ output/host/usr/bin/x86_64-amd-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/media/AAA/tmp/buildroot_toolchain/output/host/opt/ext-toolchain/bin/x86_64-amd-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/media/AAA/tmp/buildroot_toolchain/output/host/opt/ext-toolchain/bin/../libexec/gcc/x86_64-amd-linux-gnu/6.2.0/lto-wrapper
Target: x86_64-amd-linux-gnu
Configured with: /scratch/jmyers/amd-lite/src/gcc-6-2016.11/configure --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --target=x86_64-amd-linux-gnu --enable-threads --disable-libmudflap --disable-libstdcxx-pch --enable-extra-sgxxlite-multilibs --with-arch=btver2 --with-cpu=btver2 --with-gnu-as --with-gnu-ld --with-specs='-D__CS_SOURCERYGXX_MAJ__=2016 -D__CS_SOURCERYGXX_MIN__=11 -D__CS_SOURCERYGXX_REV__=19' --enable-languages=c,c++ --enable-shared --enable-lto --enable-symvers=gnu --enable-__cxa_atexit --with-glibc-version=2.24 --with-pkgversion='Sourcery CodeBench Lite 2016.11-19' --with-bugurl=https://sourcery.mentor.com/GNUToolchain/ --disable-nls --prefix=/opt/codesourcery --with-sysroot=/opt/codesourcery/x86_64-amd-linux-gnu/libc --with-build-sysroot=/scratch/jmyers/amd-lite/install/opt/codesourcery/x86_64-amd-linux-gnu/libc --with-gmp=/scratch/jmyers/amd-lite/obj/pkg-2016.11-19-x86_64-amd-linux-gnu/amd-2016.11-19-x86_64-amd-linux-gnu.extras/host-libs-i686-pc-linux-gnu/usr --with-mpfr=/scratch/jmyers/amd-lite/obj/pkg-2016.11-19-x86_64-amd-linux-gnu/amd-2016.11-19-x86_64-amd-linux-gnu.extras/host-libs-i686-pc-linux-gnu/usr --with-mpc=/scratch/jmyers/amd-lite/obj/pkg-2016.11-19-x86_64-amd-linux-gnu/amd-2016.11-19-x86_64-amd-linux-gnu.extras/host-libs-i686-pc-linux-gnu/usr --with-isl=/scratch/jmyers/amd-lite/obj/pkg-2016.11-19-x86_64-amd-linux-gnu/amd-2016.11-19-x86_64-amd-linux-gnu.extras/host-libs-i686-pc-linux-gnu/usr --enable-libgomp --enable-libitm --enable-libatomic --disable-libssp --disable-libcc1 --enable-poison-system-directories --with-python-dir=x86_64-amd-linux-gnu/share/gdb/python --with-build-time-tools=/scratch/jmyers/amd-lite/install/opt/codesourcery/x86_64-amd-linux-gnu/bin --with-build-time-tools=/scratch/jmyers/amd-lite/install/opt/codesourcery/x86_64-amd-linux-gnu/bin SED=sed
Thread model: posix
gcc version 6.2.0 (Sourcery CodeBench Lite 2016.11-19)
Buildroot：
Using built-in specs.
COLLECT_GCC=/media/AAA/tmp/buildroot_toolchain/output/host/opt/ext-toolchain/bin/x86_64-linux-gcc.br_real
COLLECT_LTO_WRAPPER=/media/AAA/tmp/buildroot_toolchain/output/host/opt/ext-toolchain/bin/../libexec/gcc/x86_64-buildroot-linux-gnu/7.5.0/lto-wrapper
Target: x86_64-buildroot-linux-gnu
Configured with: ./configure --prefix=/media/AAA/tmp/buildroot_toolchain/output/host --sysconfdir=/media/AAA/tmp/buildroot_toolchain/output/host/etc --enable-static --target=x86_64-buildroot-linux-gnu --with-sysroot=/media/AAA/tmp/buildroot_toolchain/output/host/x86_64-buildroot-linux-gnu/sysroot --enable-__cxa_atexit --with-gnu-ld --disable-libssp --disable-multilib --disable-decimal-float --with-gmp=/media/AAA/tmp/buildroot_toolchain/output/host --with-mpc=/media/AAA/tmp/buildroot_toolchain/output/host --with-mpfr=/media/AAA/tmp/buildroot_toolchain/output/host --with-pkgversion='Buildroot 2020.02.1-00007-g345f377da1-dirty' --with-bugurl=http://bugs.buildroot.net/ --enable-libquadmath --enable-tls --enable-threads --without-isl --without-cloog --with-arch=btver2 --enable-languages=c,c++ --with-build-time-tools=/media/AAA/tmp/buildroot_toolchain/output/host/x86_64-buildroot-linux-gnu/bin --enable-shared --disable-libgomp
Thread model: posix
gcc version 7.5.0 (Buildroot 2020.02.1-00007-g345f377da1-dirty)
您是否看到gcc和buildroot工具链可能需要的某些选项？
提前感谢。
PS：我什至没有尝试过gcc 8。
早期的4.4.x内核在使用binutils> = 2.31构建时不会启动。此问题已在4.4.x稳定分支的提交https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=073bb7ddd35ca8f17a170258dacbe384935a43c8中修复，该分支已合并到4.4.124中。因此，使用binutils> = 2.31构建的任何早于该版本的4.4.x都不会启动。