[Bug 230659] xhci(4) devices cannot attach after warm boot (Intel Braswell)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230659

--- Comment #2 from Maxim Sobolev <sobomax at FreeBSD.org> ---
(In reply to Hans Petter Selasky from comment #1)

Yes it is enabled. If I switch it off then I have no way to switch it on, as
USB keyboard is the only way to access the BIOS. I've tried to set XHCI mode to
"OFF", but it has the same effect as disabling USB altogether, i.e. blocking
further access to BIOS and none of the USB peripherals are working after that
after FreeBSD boots. The board has no way to do "factory reset" so that this is
very painful experiment as the only way to recover it after that change is to
re-flash the BIOS with an external programmer. Apparently it stores settings in
the same EEPROM as the rest of the BIOS code.

This is Lattepanda board in question:

https://www.dfrobot.com/product-1404.html?gclid=EAIaIQobChMI_NHk3fvx3AIVgcpkCh07nwi9EAAYAiAAEgJNB_D_BwE

If it helps in any way we can send you one for investigation. We also see this
issue with this box built on the same chipset.

https://www.aliexpress.com/item/Original-Cenovo-Mini-PC-2-Intel-X5-Z8300-Quad-Core-Windows-10-2GB-4GB-RAM-32GB/32657584443.html

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