On 13 October 2018 at 21:52, Bin Meng <bmeng...@gmail.com> wrote: > With the '-march=core2' fix, it seems that we have some luck that > the 64-bit U-Boot boots again. However if we examine the disassembly > codes there are still SSE instructions elsewhere which means passing > cpu type to GCC is not enough to prevent it from generating these > instructions. A simple test case is doing a 'bootefi selftest' from > the U-Boot shell and it leads to a reset too. > > The 'bootefi selftest' reset is even seen with the image created by > the relative older GCC 5.4.0, the one shipped by Ubuntu 16.04. > > The reset actually originates from undefined instruction exception > caused by these SSE instructions. To keep U-Boot as a bootloader as > simple as possible, we don't want to handle such advanced SIMD stuff. > To make sure no MMX/SSE instruction sets are generated, tell GCC not > to do this. Note AVX is out of the question as CORE2 is old enough > to support AVX yet. > > Signed-off-by: Bin Meng <bmeng...@gmail.com> > Reviewed-by: Heinrich Schuchardt <xypron.g...@gmx.de> > --- > > Changes in v2: None > > arch/x86/config.mk | 1 + > 1 file changed, 1 insertion(+)
Reviewed-by: Simon Glass <s...@chromium.org> _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
