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MIPS: Support for targetting MIPSr6

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Add support for targetting MIPS32r6 & MIPS64r6 systems, in the same way
that we currently select release 1 or release 2 targets. MIPSr6 is not
entirely backwards compatible with earlier releases of the architecture.
Some instructions are encoded differently, some are removed, some are
reused, so it is not practical to run U-Boot built for earlier revisions
on a MIPSr6 system. Update their Kconfig help text to reflect that.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
This commit is contained in:
Paul Burton 2016-05-16 10:52:12 +01:00 committed by Daniel Schwierzeck
parent 20286cdff7
commit c52ebea1cc
2 changed files with 30 additions and 6 deletions
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34
arch/mips/Kconfig
View File

@ -104,7 +104,7 @@ config CPU_MIPS32_R1
depends on SUPPORTS_CPU_MIPS32_R1
select 32BIT
help
Choose this option to build an U-Boot for release 1 or later of the
Choose this option to build an U-Boot for release 1 through 5 of the
MIPS32 architecture.
config CPU_MIPS32_R2
@ -112,7 +112,15 @@ config CPU_MIPS32_R2
depends on SUPPORTS_CPU_MIPS32_R2
select 32BIT
help
Choose this option to build an U-Boot for release 2 or later of the
Choose this option to build an U-Boot for release 2 through 5 of the
MIPS32 architecture.
config CPU_MIPS32_R6
bool "MIPS32 Release 6"
depends on SUPPORTS_CPU_MIPS32_R6
select 32BIT
help
Choose this option to build an U-Boot for release 6 or later of the
MIPS32 architecture.
config CPU_MIPS64_R1
@ -120,7 +128,7 @@ config CPU_MIPS64_R1
depends on SUPPORTS_CPU_MIPS64_R1
select 64BIT
help
Choose this option to build a kernel for release 1 or later of the
Choose this option to build a kernel for release 1 through 5 of the
MIPS64 architecture.
config CPU_MIPS64_R2
@ -128,7 +136,15 @@ config CPU_MIPS64_R2
depends on SUPPORTS_CPU_MIPS64_R2
select 64BIT
help
Choose this option to build a kernel for release 2 or later of the
Choose this option to build a kernel for release 2 through 5 of the
MIPS64 architecture.
config CPU_MIPS64_R6
bool "MIPS64 Release 6"
depends on SUPPORTS_CPU_MIPS64_R6
select 64BIT
help
Choose this option to build a kernel for release 6 or later of the
MIPS64 architecture.
endchoice
@ -175,19 +191,25 @@ config SUPPORTS_CPU_MIPS32_R1
config SUPPORTS_CPU_MIPS32_R2
bool
config SUPPORTS_CPU_MIPS32_R6
bool
config SUPPORTS_CPU_MIPS64_R1
bool
config SUPPORTS_CPU_MIPS64_R2
bool
config SUPPORTS_CPU_MIPS64_R6
bool
config CPU_MIPS32
bool
default y if CPU_MIPS32_R1 || CPU_MIPS32_R2
default y if CPU_MIPS32_R1 || CPU_MIPS32_R2 || CPU_MIPS32_R6
config CPU_MIPS64
bool
default y if CPU_MIPS64_R1 || CPU_MIPS64_R2
default y if CPU_MIPS64_R1 || CPU_MIPS64_R2 || CPU_MIPS64_R6
config MIPS_TUNE_4KC
bool

2
arch/mips/Makefile
View File

@ -19,8 +19,10 @@ PLATFORM_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
# Optimize for MIPS architectures
arch-$(CONFIG_CPU_MIPS32_R1) += -march=mips32 -Wa,-mips32
arch-$(CONFIG_CPU_MIPS32_R2) += -march=mips32r2 -Wa,-mips32r2
arch-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,-mips32r6
arch-$(CONFIG_CPU_MIPS64_R1) += -march=mips64 -Wa,-mips64
arch-$(CONFIG_CPU_MIPS64_R2) += -march=mips64r2 -Wa,-mips64r2
arch-$(CONFIG_CPU_MIPS64_R6) += -march=mips64r6 -Wa,-mips64r6
# Allow extra optimization for specific CPUs/SoCs
tune-$(CONFIG_MIPS_TUNE_4KC) += -mtune=4kc