[Bug 271147] Adding support for Sunrise Point uart hangs boot

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 06 May 2023 18:02:22 UTC

--- Comment #5 from Joe Marcus Clarke <marcus@FreeBSD.org> ---
Unfortunately, the shift reg change didn't work.  The hang was the same (just
after igb5 is probed and before ISA).  I tried the 24x clock, too (with both 0
and 2 for shift reg) and the behavior was the same.  I even disabled the two
serial ports in the BIOS, but the boot still hung.  The only thing that works
is not to probe that PCI device.  I noticed in -CURRENT there was some MSI
exclusion support added (if I read that right).  Not sure if that would be
helpful or not here.

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