Installation fails on Tyan POWER8 box with ahci command timeouts.

[Karel Gardas]

Hello,

my attempt to install 12.0 on Tyan TN71-BP012 box with POWER8 CPU fails 
while extracting distribution files. The message -- probably kernel 
complain as it "destroys" nice curses dialog of Archive Extraction -- 
contains this:

ahcich1: Timeout on slot 0 port 0
ahcich1: is 00000000 cs fdffffff ss ffffffff rs ffffffff tfd 40 serr 
00000000 cmd 00719917
(ada0:ahcich1:0:0:0): WRITE_FPDMA_QUEUED. ACB 61 00 28 e6 d0 40 06 00 00 
01 00 00
(ada0:ahcich1:0:0:0): CAM status: Command timeout
(ada0:ahcich1:0:0:0): Retrying command, 3 more tries remain
ahcich1: Timeout on slot 25 port 0
ahcich1: is 00000000 cs 02000000 ss 00000000 rs 02000000 tfd 150 serr 
000000000 cmd 0071c017
(apropbe0:ahcich1:0:0:0): ATA_IDENTITY. ACB: ec 00 00 00 00 40 00 00 00 
00 00 00
(apropbe0:ahcich1:0:0:0): CAM status: Command timeout
(apropbe0:ahcich1:0:0:0): Retrying command, 0 more tries remain


I'm not sure if I've shoot all before panic. I guess what happened after 
those messages is kernel panic and then straight reboot.
The drive connected to Marvel SATA mezanine board in Tyan is WD GOLD 
500GB SATA.
Is there any workaround for this issue? As I'd like to have FreeBSD 
running on bare-metal/powernv instead of inside the PowerKVN provided in 
also installed ubuntu, where freebsd works fine.


Thanks!
Karel