From: Palmer Dabbelt palmer@rivosinc.com
For non-relocatable kernels we need to be able to link the kernel at approximately PAGE_OFFSET, thus requiring medany (as medlow requires the code to be linked within 2GiB of 0). The inverse doesn't apply, though: since medany code can be linked anywhere it's fine to link it close to 0, so we can support the smaller memory config.
Fixes: de5f4b8f634b ("RISC-V: Define MAXPHYSMEM_1GB only for RV32") Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt palmer@rivosinc.com
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I found this when going through the savedefconfig diffs for the K210 defconfigs. I'm not entirely sure they're doing the right thing here (they should probably be setting CMODEL_LOW to take advantage of the better code generation), but I don't have any way to test those platforms so I don't want to change too much. --- arch/riscv/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 821252b65f89..61f64512dcde 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -280,7 +280,7 @@ choice depends on 32BIT bool "1GiB" config MAXPHYSMEM_2GB - depends on 64BIT && CMODEL_MEDLOW + depends on 64BIT bool "2GiB" config MAXPHYSMEM_128GB depends on 64BIT && CMODEL_MEDANY