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authorAtish Patra2021-01-11 15:45:04 -0800
committerPalmer Dabbelt2021-01-15 21:35:48 -0800
commite557793799c5a8406afb08aa170509619f7eac36 (patch)
tree297e8009c61fcea38d8d00ce168c854e514304d9
parentabb8e86b269604e906a6a4af7a09f04b72dbb862 (diff)
RISC-V: Fix maximum allowed phsyical memory for RV32
Linux kernel can only map 1GB of address space for RV32 as the page offset is set to 0xC0000000. The current description in the Kconfig is confusing as it indicates that RV32 can support 2GB of physical memory. That is simply not true for current kernel. In future, a 2GB split support can be added to allow 2GB physical address space. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
-rw-r--r--arch/riscv/Kconfig6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 81b76d44725d..e9e2c1f0a690 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -137,7 +137,7 @@ config PA_BITS
config PAGE_OFFSET
hex
- default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
+ default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB
default 0x80000000 if 64BIT && !MMU
default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
@@ -247,10 +247,12 @@ config MODULE_SECTIONS
choice
prompt "Maximum Physical Memory"
- default MAXPHYSMEM_2GB if 32BIT
+ default MAXPHYSMEM_1GB if 32BIT
default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
+ config MAXPHYSMEM_1GB
+ bool "1GiB"
config MAXPHYSMEM_2GB
bool "2GiB"
config MAXPHYSMEM_128GB