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

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Thu Aug 16 16:16:35 UTC 2018


--- 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:


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.


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