On Wed, Jul 27, 2022 at 10:44 PM Ben Dooks <ben.do...@codethink.co.uk> wrote: > > On 27/07/2022 15:38, Bin Meng wrote: > > On Wed, Jul 27, 2022 at 10:24 PM Ben Dooks <q...@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
Yep I know that. I was asking if you use a vendor-specific CSR approach in QEMU to handle such cleanly. > > >> > >> 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. > > Regards, Bin
