From b5e2c507b06c9d36411845149162a804ae7b04a9 Mon Sep 17 00:00:00 2001 From: Yimin Gu Date: Tue, 28 Feb 2023 19:26:56 -0500 Subject: riscv: Kconfig: Allow RV32 to build with no MMU Some RISC-V 32bit cores do not have an MMU, and the kernel should be able to build for them. This patch enables the RV32 to be built with no MMU support. Signed-off-by: Yimin Gu CC: Jesse Taube Tested-by: Waldemar Brodkorb Signed-off-by: Jesse Taube Reviewed-by: Damien Le Moal Reviewed-by: Conor Dooley Link: https://lore.kernel.org/r/20230301002657.352637-3-Mr.Bossman075@gmail.com Signed-off-by: Palmer Dabbelt --- arch/riscv/Kconfig | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c5e42cc37604..d1f661425790 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -177,8 +177,8 @@ 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 @@ -279,7 +279,6 @@ config ARCH_RV32I select GENERIC_LIB_ASHRDI3 select GENERIC_LIB_LSHRDI3 select GENERIC_LIB_UCMPDI2 - select MMU config ARCH_RV64I bool "RV64I" -- cgit v1.2.3 From 77c0c966719f07f14c82f358745f77582580cdcd Mon Sep 17 00:00:00 2001 From: Jesse Taube Date: Tue, 28 Feb 2023 19:26:57 -0500 Subject: riscv: configs: Add nommu PHONY defconfig for RV32 32bit risc-v can be configured to run without MMU. Introduce rv32_nommu_virt_defconfig .PHONY target, that is based on nommu_virt_defconfig. This is similar to how rv32_defconfig is based on "defconfig". Suggested-by: Conor Dooley Signed-off-by: Jesse Taube Cc: Yimin Gu Reviewed-by: Conor Dooley Link: https://lore.kernel.org/r/20230301002657.352637-4-Mr.Bossman075@gmail.com Signed-off-by: Palmer Dabbelt --- arch/riscv/Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 6203c3378922..1b276f62f22b 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -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 -- cgit v1.2.3