On Tue, May 21, 2024 at 1:20 AM Jiaxun Yang jiaxun.yang@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@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.