11.0 hangs on boot after install - Sun Fire V245

[Gordon Zaft]

I just installed 11.0--p1 Release on a Sun Fire V245.  The install went
okay but then when I booted after install it hangs at:

(da0:mpt0:0:0:0): UNMAPPED
da0 at mpt0 bus 0 scbus2 target 0 lun 0
da0: <HITACHI H101414SCSUN146G SA23> Fixed Direct Access SPC-3 SCSI device
da0: Serial Number 000815EXH39A        P4VXH39A
da0: 300.000MB/s transfers
da0: Command Queueing enabled
da0: 140009MB (286739329 512 byte sectors)
SMP: AP CPU #1 Launched!
cd0 at ata2 bus 0 scbus0 target 0 lun 0
cd0: <TSSTcorp CD/DVDW TS-T632A SR03> Removable CD-ROM SCSI device
cd0: 33.300MB/s transfersTrying to mount root from ufs:/dev/da0a [rw]...
 (UDMA2, ATAPI 12bytes, PIO 65534bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present -
tray open
uhub2: 8 ports with 8 removable, self powered
ugen1.2: <vendor 0x03eb> at usbus1
uhub3: <Standard USB Hub> on usbus1
uhub3: 4 ports with 4 removable, self powered

I found this discussion:

https://lists.freebsd.org/pipermail/freebsd-sparc64/2016-September/009916.html

I tried doing a hard power-off and booting the machine from a cold start
but it did not help.

Any suggestions?  Right now all I can think of to do is to try to build a
custom kernel on another machine with the ehci line commented out.  My only
other sparc64 machine is a U5 with insufficient disk space to build a
full-on release though.

Would I be better off trying to install 10.3 and then do an upgrade with a
custom kernel?  This is a nice machine and I would like to run 11.0 on it.

G

-- 
Gordon Zaft
Province 35 Governor
Phi Mu Alpha Sinfonia Fraternity
gordonzaft at gmail.com