[PATCH v2 2/3] riscv: Kconfig: Allow RV32 to build with no MMU

From: Jesse Taube
Date: Sun Feb 12 2023 - 15:55:23 EST


From: Yimin Gu <ustcymgu@xxxxxxxxx>

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 <ustcymgu@xxxxxxxxx>
CC: Jesse Taube <Mr.Bossman075@xxxxxxxxx>
Tested-by: Waldemar Brodkorb <wbx@xxxxxxxxxxx>
Signed-off-by: Jesse Taube <Mr.Bossman075@xxxxxxxxx>
---
arch/riscv/Kconfig | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 59d18881f35b..49759dbe6a8f 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -163,8 +163,8 @@ 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
@@ -262,7 +262,6 @@ config ARCH_RV32I
select GENERIC_LIB_ASHRDI3
select GENERIC_LIB_LSHRDI3
select GENERIC_LIB_UCMPDI2
- select MMU

config ARCH_RV64I
bool "RV64I"
--
2.39.0