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arch/x86: Prevent romcc bootblock from using MMX registers 

Platforms with SSE=y or SSE2=y will invoke romcc with -mcpu=k7.
This implicitly enabled romcc to consume MMX registers, if XMM
set was consumed first.

Explicitly tell romcc not to clobber MMX set.

Change-Id: I37f1d6ea01873036712dfbb32bb1dcd5d769e85d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30392
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Kyösti Mälkki 2018-12-23 07:22:56 +02:00
parent a75ab2c46d
commit 3ba79b319e
1 changed files with 1 additions and 1 deletions
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2
src/arch/x86/Makefile.inc
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@ -143,7 +143,7 @@ $(call src-to-obj,bootblock,$(dir)/bootblock.ld): $(objgenerated)/bootblock.ld
bootblock_romccflags := -mcpu=i386 -O2 -D__PRE_RAM__ -D__BOOTBLOCK__
ifeq ($(CONFIG_SSE),y)
bootblock_romccflags := -mcpu=k7 -msse -O2 -D__PRE_RAM__ -D__BOOTBLOCK__
bootblock_romccflags := -mcpu=k7 -mno-mmx -msse -O2 -D__PRE_RAM__ -D__BOOTBLOCK__
endif
# This is a hack in case there are no per chipset linker files.