Itaru Kitayama <itaru.kitayama@gmail.com> writes:
> Good point; however per the SBSA specification, DEN0029F, there's the
> PE architecture requirement at
> each level from 1 to 7, so now I am wondering whether supporting
> cortex-a57 and a72 are good enough to
> set up a fully SBSA level 7 compliant "board" in QMEU.
Not currently - we are working on cortex-a76/neoverse-n1 which will
provide a v8.2 baseline for sbsa-ref. See:
Subject: [PATCH 00/16] target/arm: Implement features Debugv8p4, RAS, IESB
Date: Fri, 8 Apr 2022 17:07:26 -0700
Message-Id: <20220409000742.293691-1-richard.henderson@linaro.org" target="_blank">20220409000742.293691-1-richard.henderson@linaro.org>
and:
Subject: [PATCH 0/7] target/arm: More trivial features, A76, N1
Date: Sat, 9 Apr 2022 22:57:18 -0700
Message-Id: <20220410055725.380246-1-richard.henderson@linaro.org" target="_blank">20220410055725.380246-1-richard.henderson@linaro.org>
which are stepping stones to those concrete models. Please review if you
can.
Sure, Shuichi and I will review Richard’s series and give feedback if there’s any.
Itaru.
> Also, the 'max'
> is there, but does not boot.
Generally the firmware has to be built with the knowledge of what system
it is running on so will generally fall over if run on a different CPU
feature set. However I believe Leif had a firmware branch which attempts
to work with -cpu max by doing proper ID register probing before using
features. However -cpu max is very a moving feast which is why there is
a push for the concrete CPU types.
I believe there is a proposal for a versioned sbsa-ref model which will
step of the default CPU for higher levels.
>
> Itaru.
>
> On Sat, Apr 9, 2022 at 12:04 AM Peter Maydell <peter.maydell@linaro.org> wrote:
>>
>> On Fri, 8 Apr 2022 at 15:59, Itaru Kitayama <itaru.kitayama@gmail.com> wrote:
>> > I'd like to add a64fx cpu to the sbsa-ref board, if there's a quick and dirty
>> > way of completing that, advice from the maintainers is greatly appreciated.
>>
>> I have cc'd the sbsa-ref maintainers (as listed in the MAINTAINERS file).
>>
>> However, I'm not sure why you want to add the a64fx CPU to this
>> board model? The sbsa-ref board is intended as a platform for
>> developing firmware that runs on Server Base System Architecture
>> hardware, so it deliberately doesn't have support for every CPU
>> type QEMU implements.
>>
>> thanks
>> -- PMM
--
Alex Bennée