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

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Date:   Sat, 12 Jun 2021 17:23:51 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     emil.renner.berthing@...il.com
CC:     alex@...ti.fr, Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, jszhang@...nel.org,
        Christoph Hellwig <hch@...radead.org>, zong.li@...ive.com,
        anup@...infault.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject:     Re: [PATCH v4 1/4] riscv: Remove CONFIG_PHYS_RAM_BASE_FIXED

On Sat, 12 Jun 2021 16:23:03 PDT (-0700), emil.renner.berthing@...il.com wrote:
> On Fri, 4 Jun 2021 at 13:51, Alexandre Ghiti <alex@...ti.fr> 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?

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

>
> /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@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-riscv

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