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Re: fu740 target

From: Ben Dooks
Subject: Re: fu740 target
Date: Wed, 27 Jul 2022 15:44:38 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0

On 27/07/2022 15:38, Bin Meng wrote:
On Wed, Jul 27, 2022 at 10:24 PM Ben Dooks <qemu@ben.fluff.org> wrote:

Is anyone working on adding a sifive-u74 core to the list of supported
CPU types? I was looking at full emulation of the Unmatched but at the
moment the best we have is sifive-u54 and I think that misses at least
two CSRs the sifive-u74 has.

Does anyone have plans to add the sifive-u74, and if not, would a plan
to add gradual support for it like adding CSRs 0x7c1 and 0x7c2 so we
can run an Unmatched U-boot SPL against it.

Adding 0x7c1/7c2 would be a vendor-specific CSR approach?

Part of the FU740 feature disable controls

If not, is there a definitive U54->U74 set of public differnces around
we could use to start from? I'd like to be able to run a full Unmatched
image using qemu at some point to add to the current real-board testing
we're doing.

(I have a basic addition of the type and the two CSRs as a couple of
patches if that would help as a start)

I am not aware of anyone doing U74 modeling in QEMU, but SiFive folks
(+Frank) may have one downstream as I see they posted several bug
fixes in the existing U54 model.



Ben Dooks                               http://www.codethink.co.uk/
Senior Engineer                         Codethink - Providing Genius


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