linux-kernel - Re: [PATCH v8] RISC-V: enable XIP

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Date:   Tue, 27 Apr 2021 20:35:21 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     linux@...ck-us.net
CC:     alex@...ti.fr, Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, vitaly.wool@...sulko.com
Subject:     Re: [PATCH v8] RISC-V: enable XIP

On Tue, 27 Apr 2021 20:08:24 PDT (-0700), linux@...ck-us.net wrote:
> On Tue, Apr 13, 2021 at 02:35:14AM -0400, Alexandre Ghiti wrote:
>> From: Vitaly Wool <vitaly.wool@...sulko.com>
>>
>> Introduce XIP (eXecute In Place) support for RISC-V platforms.
>> It allows code to be executed directly from non-volatile storage
>> directly addressable by the CPU, such as QSPI NOR flash which can
>> be found on many RISC-V platforms. This makes way for significant
>> optimization of RAM footprint. The XIP kernel is not compressed
>> since it has to run directly from flash, so it will occupy more
>> space on the non-volatile storage. The physical flash address used
>> to link the kernel object files and for storing it has to be known
>> at compile time and is represented by a Kconfig option.
>>
>> XIP on RISC-V will for the time being only work on MMU-enabled
>> kernels.
>>
>> Signed-off-by: Alexandre Ghiti <alex@...ti.fr> [ Rebase on top of "Move
>> kernel mapping outside the linear mapping" ]
>> Signed-off-by: Vitaly Wool <vitaly.wool@...sulko.com>
>> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
>
> In next-20210426, when building riscv:allnoconfig or riscv:tinyconfig:
>
> arch/riscv/kernel/setup.c: In function 'setup_arch':
> arch/riscv/kernel/setup.c:284:32: error: implicit declaration of function 'XIP_FIXUP'

Sorry about that.  I thought I'd fixed the last build, but I guess I 
managed to just miss these build failures in a spew of successes.  I 
just sent out a patch to fix it.