Re: [PATCH v4 2/4] qemuarm64.conf: allow overriding QB_OPT_APPEND

[Mikko Rapeli <mikko.rapeli@linaro.org>]

Hi,

On Tue, May 27, 2025 at 06:52:47PM -0600, Tom Rini wrote:
> On Mon, May 26, 2025 at 11:35:45AM +0300, Mikko Rapeli wrote:
> 
> > It enables qemu USB support which causes a reset
> > loop currently with u-boot.
> > 
> > Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
> > ---
> >  meta/conf/machine/qemuarm64.conf | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> This too feel like something that should be brought up on the U-Boot
> side.

We saw these issues in 2023 on qemu but thought they were specific to our
Trusted Substrate config with tf-a, OP-TEE and u-boot. Some public info is
in: https://linaro.atlassian.net/browse/LEDGE-435

I know USB support is really tricky with timings etc so I don't expect
it to work well with bootloaders. Hence did not dig deeper.

Now that I saw this reset loop with KVM I will note the details down
with reproduction steps and send to u-boot list.

But I think overriding QB_OPT_APPEND is handy, wether it has USB setup
or something else. Other layers in yocto ecosystem use qemuarm64 as basis
machine with testing and may want to change this.

Cheers,

-Mikko