[Bug 235016] ASIX AX99100 based uart controllers broken on 12.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235016

Jan Martin Mikkelsen <janm at transactionware.com> changed:

           What    |Removed                     |Added
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                 CC|                            |janm at transactionware.com

--- Comment #3 from Jan Martin Mikkelsen <janm at transactionware.com> ---
We saw similar problems on 12.0 with eight port Moxa SmartIO CP-168EL devices
in the middle of last year. No characters in, one character out and then the
port stalled.

The issue was worked around by adding "hw.puc.msi_disable=1" to loader.conf.

I don't have time to go looking in the driver, but the problem was certainly
MSI related.

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