Re: [BUG] uas: JMS578 returns reproducibly incorrect data after host reboot

[Oliver Neukum]

On 16.09.26 20:47, Michal Pecio wrote:
> On Wed, 16 Sep 2026 19:56:25 +0200, djraszit wrote:

> Looks like JMS578 doesn't like being connected to a booting Pi 4.
>
> Or maybe it's shutdown? What happens if you:
>
> - disconnect, shutdown, connect, boot
> - shutdown, disconnect, boot, connect

Maybe it would be worthwhile to shut the RPi down the hard
way, that is by suddenly depriving it of power.

> If the problem is boot (second case works, first case fails), then
> I wonder if it's the firmware or the kernel. Maybe you could plug

But then why does it work at all? You'd have to assume that
the second boot crashes the device.

> the disk after the kernel beigns booting, but before xhci_hcd loads?
> You could blacklist it if it's a module, or bind pci-stub to VL805
> to prevent automatic xhci_hcd activation and widen the time window.

	Regards
		Oliver