Re: [PATCH v4 1/4] riscv: Remove CONFIG_PHYS_RAM_BASE_FIXED

From: Jisheng Zhang
Date: Sat Jun 12 2021 - 22:07:58 EST


On Sat, 12 Jun 2021 17:23:51 -0700 (PDT)
Palmer Dabbelt <palmer@xxxxxxxxxxx> wrote:

> On Sat, 12 Jun 2021 16:23:03 PDT (-0700), emil.renner.berthing@xxxxxxxxx wrote:
> > On Fri, 4 Jun 2021 at 13:51, Alexandre Ghiti <alex@xxxxxxxx> wrote:
> >>
> >> Make the physical RAM base address available for all kernels, not only
> >> XIP kernels as it will allow to simplify address conversions macros.
> >
> > Am I just reading it wrong or won't this patch make it so that the same kernel
> > can't run on two chips with physical ram starting at different addresses?

I mentioned this point in http://lists.infradead.org/pipermail/linux-riscv/2021-June/006840.html

>
> IIUC we were in that position, at least without relocatable kernels.
> Maybe I'm misunderstanding this, though?

Just my humble opinion, before this series patch, at least geneirc Image
for RV64 + MMU + !XIP is doable.

Thanks

>
> >
> > /Emil
> >
> >> ---
> >> arch/riscv/Kconfig | 6 ------
> >> 1 file changed, 6 deletions(-)
> >>
> >> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> >> index b58596b141fc..3d8e7e4bb45c 100644
> >> --- a/arch/riscv/Kconfig
> >> +++ b/arch/riscv/Kconfig
> >> @@ -493,13 +493,8 @@ config STACKPROTECTOR_PER_TASK
> >> def_bool y
> >> depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
> >>
> >> -config PHYS_RAM_BASE_FIXED
> >> - bool "Explicitly specified physical RAM address"
> >> - default n
> >> -
> >> config PHYS_RAM_BASE
> >> hex "Platform Physical RAM address"
> >> - depends on PHYS_RAM_BASE_FIXED
> >> default "0x80000000"
> >> help
> >> This is the physical address of RAM in the system. It has to be
> >> @@ -512,7 +507,6 @@ config XIP_KERNEL
> >> # This prevents XIP from being enabled by all{yes,mod}config, which
> >> # fail to build since XIP doesn't support large kernels.
> >> depends on !COMPILE_TEST
> >> - select PHYS_RAM_BASE_FIXED
> >> help
> >> Execute-In-Place allows the kernel to run from non-volatile storage
> >> directly addressable by the CPU, such as NOR flash. This saves RAM
> >> --
> >> 2.30.2
> >>
> >>
> >> _______________________________________________
> >> linux-riscv mailing list
> >> linux-riscv@xxxxxxxxxxxxxxxxxxx
> >> http://lists.infradead.org/mailman/listinfo/linux-riscv
>
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