[PATCH 09/10] board: emulation: New board qemu-xtensa

[Max Filippov]

On Tue, May 21, 2024 at 1:20 AM Jiaxun Yang <jiaxun.yang at flygoat.com> wrote:
> 在2024年5月21日五月 上午8:35，Max Filippov写道：
> >> +++ b/board/emulation/qemu-xtensa/MAINTAINERS
> >> @@ -0,0 +1,7 @@
> >> +QEMU XTENSA 'VIRT' BOARD
> >> +M:     Jiaxun Yang <jiaxun.yang at flygoat.com>
> >> +S:     Maintained
> >> +F:     board/emulation/qemu-xtensa/
> >> +F:     board/emulation/common/
> >> +F:     include/configs/qemu-riscv.h
> >
> > This must be qemu-xtensa.h, right?
>
> Ah yes :-)
>
> Do you mind me to give you a M: entry?

Sure you can add me as a co-maintainer for this board.

> > I'm not sure what CFG_SYS_IO_BASE means for the virt machine, but
> > it looks like in the noMMU case SDRAM is going to overlap the
> > IO range with the above base addresses and sizes. And from QEMU
> > monitor I see the following address space distribution in the virt
> > machine with a noMMU core:
>
> So CFG_SYS_IO_BASE means physical address left for I/O with 1:1 mapping
> from virtual address. for PTP MMU I handled it in:
>
> [PATCH 03/10] xtensa: Implement phys virt conversion for PTP_MMU
>
> Can you confirm if noMMU core is doing the same on VA-PA mapping?

So far all xtensa cores except those that have MMUv2 (like dc232b) come
out of reset with identity mapping between virtual and physical addresses.

-- 
Thanks.
-- Max