[Buildroot] [PATCH v4 3/9] arch/config: Make RISC-V 64-bits MMU optional

Damien Le Moal damien.lemoal at wdc.com
Mon Aug 30 04:40:54 UTC 2021


Linux supports No-MMU RISC-V 64-bits since kernel version 5.8. Make
MMU optional to enable building for RISC-V 64-bits boards that do not
have one. MMU use of RISC-V 32-bits builds remains mandatory for now.

Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
Reviewed-by: Alistair Francis <alistair.francis at wdc.com>
---
 arch/Config.in       | 1 -
 arch/Config.in.riscv | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/Config.in b/arch/Config.in
index 1853e26bb4..2e95b6e76c 100644
--- a/arch/Config.in
+++ b/arch/Config.in
@@ -210,7 +210,6 @@ config BR2_powerpc64le
 
 config BR2_riscv
 	bool "RISCV"
-	select BR2_ARCH_HAS_MMU_MANDATORY
 	select BR2_ARCH_NEEDS_GCC_AT_LEAST_7
 	help
 	  RISC-V is an open, free Instruction Set Architecture created
diff --git a/arch/Config.in.riscv b/arch/Config.in.riscv
index 1fc20e5de7..e6436d7c39 100644
--- a/arch/Config.in.riscv
+++ b/arch/Config.in.riscv
@@ -71,10 +71,12 @@ choice
 
 config BR2_RISCV_32
 	bool "32-bit"
+	select BR2_ARCH_HAS_MMU_MANDATORY
 
 config BR2_RISCV_64
 	bool "64-bit"
 	select BR2_ARCH_IS_64
+	select BR2_ARCH_HAS_MMU_OPTIONAL
 
 endchoice
 
-- 
2.31.1



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