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MIPS: Loongson: Add GCC 4.4 support for Loongson2E

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Because only gcc >=4.4 have loongson-specific support, we need to choose
the suitable -march argument for gcc <= 4.3 and gcc >= 4.4, and here, we
use -march=loongson2e for loongson2e.

Thanks goes to Arnaud Patard <apatard@mandriva.com> for suggestion of
using cc-options(Documentation/kbuild/makefiles.txt). and thanks Zhang
Le for introducing the new CPU_LOONGSON2E kernel option.

NOTE: -mtune option is not need if -march and -mtune use the same value.

Signed-off-by: Zhang Le <r0bertz@gentoo.org>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin 2009-07-02 23:27:41 +08:00 committed by Ralf Baechle
parent 3209e70e5e
commit 3702bba5eb
3 changed files with 17 additions and 9 deletions
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18
arch/mips/Kconfig
View File

@ -1030,12 +1030,10 @@ choice
prompt "CPU type"
default CPU_R4X00
config CPU_LOONGSON2
bool "Loongson 2"
depends on SYS_HAS_CPU_LOONGSON2
select CPU_SUPPORTS_32BIT_KERNEL
select CPU_SUPPORTS_64BIT_KERNEL
select CPU_SUPPORTS_HIGHMEM
config CPU_LOONGSON2E
bool "Loongson 2E"
depends on SYS_HAS_CPU_LOONGSON2E
select CPU_LOONGSON2
help
The Loongson 2E processor implements the MIPS III instruction set
with many extensions.
@ -1282,7 +1280,13 @@ config CPU_CAVIUM_OCTEON
endchoice
config SYS_HAS_CPU_LOONGSON2
config CPU_LOONGSON2
bool
select CPU_SUPPORTS_32BIT_KERNEL
select CPU_SUPPORTS_64BIT_KERNEL
select CPU_SUPPORTS_HIGHMEM
config SYS_HAS_CPU_LOONGSON2E
bool
config SYS_HAS_CPU_MIPS32_R1

6
arch/mips/Makefile
View File

@ -120,7 +120,11 @@ cflags-$(CONFIG_CPU_R4300) += -march=r4300 -Wa,--trap
cflags-$(CONFIG_CPU_VR41XX) += -march=r4100 -Wa,--trap
cflags-$(CONFIG_CPU_R4X00) += -march=r4600 -Wa,--trap
cflags-$(CONFIG_CPU_TX49XX) += -march=r4600 -Wa,--trap
cflags-$(CONFIG_CPU_LOONGSON2) += -march=r4600 -Wa,--trap
# only gcc >= 4.4 have the loongson-specific support
cflags-$(CONFIG_CPU_LOONGSON2) += -Wa,--trap
cflags-$(CONFIG_CPU_LOONGSON2E) += \
$(call cc-option,-march=loongson2e,-march=r4600)
cflags-$(CONFIG_CPU_MIPS32_R1) += $(call cc-option,-march=mips32,-mips32 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
-Wa,-mips32 -Wa,--trap
cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \

2
arch/mips/loongson/Kconfig
View File

@ -7,7 +7,7 @@ config LEMOTE_FULOONG2E
select ARCH_SPARSEMEM_ENABLE
select CEVT_R4K
select CSRC_R4K
select SYS_HAS_CPU_LOONGSON2
select SYS_HAS_CPU_LOONGSON2E
select DMA_NONCOHERENT
select BOOT_ELF32
select BOARD_SCACHE