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MIPS: Loongson 2F: Enable fixups of the latest binutils

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With the  "Fixups of Loongson2F" patch [1] having been applied to binutils
for binutils 2.20.1 we now can use it's time to enable the options provided
by the patch to compile the kernel.

Without these fixups, the system may hang if the erratum is triggered.

For more information on these fixups please refer to the following
references.

[1] "Fixups of Loongson2F" patch for binutils(actually for gas)
    http://sourceware.org/ml/binutils/2009-11/msg00387.html
[2] Chapter 15 of "Loongson2F User Manual"(Chinese Version)
    http://www.loongson.cn/uploadfile/file/200808211
[3] Chapter 15 of the English version Loongson 2F User Manual
    http://groups.google.com.hk/group/loongson-dev/msg/e0d2e220958f10a6?dmode=source

Signed-off-by: Zhang Le <r0bertz@gentoo.org>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Zhang Le <r0bertz@gentoo.org>
Cc: linux-mips <linux-mips@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/1106/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin 2010-04-10 20:05:01 +08:00 committed by Ralf Baechle
parent 622844bf0b
commit 8bbda428e9
1 changed files with 13 additions and 0 deletions
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13
arch/mips/Makefile
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@ -136,6 +136,19 @@ cflags-$(CONFIG_CPU_LOONGSON2E) += \
$(call cc-option,-march=loongson2e,-march=r4600)
cflags-$(CONFIG_CPU_LOONGSON2F) += \
$(call cc-option,-march=loongson2f,-march=r4600)
# enable the workarounds for loongson2f
ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-nop,),)
$(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-nop)
else
cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-nop
endif
ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-jump,),)
$(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-jump)
else
cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-jump
endif
endif
cflags-$(CONFIG_CPU_MIPS32_R1) += $(call cc-option,-march=mips32,-mips32 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
-Wa,-mips32 -Wa,--trap