On Thu, Jan 7, 2021 at 2:57 PM Atish Patra <atish.pa...@wdc.com> wrote: > > 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. > > Signed-off-by: Atish Patra <atish.pa...@wdc.com>
Just for information, Alex's also has a patch to simplify this. Refer, "[RFC PATCH 05/12] riscv: Simplify MAXPHYSMEM config" Looks good to me. Reviewed-by: Anup Patel <a...@brainfault.org> > --- > arch/riscv/Kconfig | 6 ++++-- > 1 file 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 > -- > 2.25.1 > > > _______________________________________________ > linux-riscv mailing list > linux-ri...@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv Regards, Anup
