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powerpc/microwatt: add POWER9_CPU, clear PPC_64S_HASH_MMU

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Microwatt implements a subset of ISA v3.0 (which is equivalent to
the POWER9_CPU option). It is radix-only, so does not require hash
MMU support.

This saves 20kB compressed dtbImage and 56kB vmlinux size.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211201144153.2456614-19-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-12-02 00:41:53 +10:00 committed by Michael Ellerman
parent 387e220a2e
commit 31284f703d
2 changed files with 2 additions and 2 deletions
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3
arch/powerpc/configs/microwatt_defconfig
View File

@ -15,6 +15,8 @@ CONFIG_EMBEDDED=y
# CONFIG_COMPAT_BRK is not set
# CONFIG_SLAB_MERGE_DEFAULT is not set
CONFIG_PPC64=y
CONFIG_POWER9_CPU=y
# CONFIG_PPC_64S_HASH_MMU is not set
# CONFIG_PPC_KUEP is not set
# CONFIG_PPC_KUAP is not set
CONFIG_CPU_LITTLE_ENDIAN=y
@ -27,7 +29,6 @@ CONFIG_PPC_MICROWATT=y
CONFIG_CPU_FREQ=y
CONFIG_HZ_100=y
CONFIG_PPC_4K_PAGES=y
# CONFIG_PPC_MEM_KEYS is not set
# CONFIG_SECCOMP is not set
# CONFIG_MQ_IOSCHED_KYBER is not set
# CONFIG_COREDUMP is not set

1
arch/powerpc/platforms/microwatt/Kconfig
View File

@ -5,7 +5,6 @@ config PPC_MICROWATT
select PPC_XICS
select PPC_ICS_NATIVE
select PPC_ICP_NATIVE
select PPC_HASH_MMU_NATIVE if PPC_64S_HASH_MMU
select PPC_UDBG_16550
select ARCH_RANDOM
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