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Merge patch series "Add RISC-V 32 NOMMU support"

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Jesse Taube <mr.bossman075@gmail.com> says:

This patch-set aims to add NOMMU support to RV32.
Many people want to build simple emulators or HDL
models of RISC-V this patch makes it possible to
run linux on them.

Yimin Gu is the original author of this set.
Submitted here:
https://lists.buildroot.org/pipermail/buildroot/2022-November/656134.html

Though Jesse T rewrote the Dconf.

* b4-shazam-merge:
  riscv: configs: Add nommu PHONY defconfig for RV32
  riscv: Kconfig: Allow RV32 to build with no MMU

Link: https://lore.kernel.org/r/20230301002657.352637-1-Mr.Bossman075@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Palmer Dabbelt 2023-03-27 16:27:49 -07:00
commit e97be4fbc1
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2 changed files with 6 additions and 3 deletions
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5
arch/riscv/Kconfig
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@ -178,8 +178,8 @@ config MMU
config PAGE_OFFSET
hex
default 0xC0000000 if 32BIT
default 0x80000000 if 64BIT && !MMU
default 0xC0000000 if 32BIT && MMU
default 0x80000000 if !MMU
default 0xff60000000000000 if 64BIT
config KASAN_SHADOW_OFFSET
@ -280,7 +280,6 @@ config ARCH_RV32I
select GENERIC_LIB_ASHRDI3
select GENERIC_LIB_LSHRDI3
select GENERIC_LIB_UCMPDI2
select MMU
config ARCH_RV64I
bool "RV64I"

4
arch/riscv/Makefile
View File

@ -174,3 +174,7 @@ rv64_randconfig:
PHONY += rv32_defconfig
rv32_defconfig:
$(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
PHONY += rv32_nommu_virt_defconfig
rv32_nommu_virt_defconfig:
$(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config