Re: qemu-system-sh4eb build has something hinky in the ethernet

[Philippe Mathieu-Daudé <philmd@linaro.org>]

On 1/9/25 09:47, Geert Uytterhoeven wrote:

> On Sun, 24 Aug 2025 at 20:40, Rob Landley <rob@landley.net> wrote:
> > Anyway, this works fine on little endian, but the qemu-system-sh4eb
> > build has something hinky in the ethernet, I haven't tackled it myself
> > because I don't know whether the device emulation or the driver is
> > what's missing an endian swap. (I don't want to fix it the "wrong way",
>
> That is using sh_eth, right?
>
> Last time I tried booting a big-endian ARM kernel on R-Car M2-W,
> the Linux kernel booted fine, except for Ethernet.  So sh_eth is definitely
> not big-endian clean.

qemu-system-sh4{eb} only emulates the R2D+ board, which AFAIK
provides ethernet via a RTL8139 over PCI. While old, RTL8139
is very tested and expected to have endianness well handled.

> [*] I didn't have a big-endian userspace.
>
> Gr{oetje,eeting}s,
>
>                          Geert