[issue1449] AHCI panic on Intel 6321ESB AHCI

["Alexander Polakov \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Alexander Polakov <polachok@gmail.com> added the comment:

>Is there just one hard drive in the system?

Second one is connected to mpt (see http://bugs.dragonflybsd.org/issue1451).

>Reboot a couple of times.  Is it failing on the same port every time
>or is it jumping around?
Finally, I opened the case and started to switch ports. It works okay (YEH!) 
with ports from 2 to 5 (I tried 2 times each), with port 1 one time it hanged 
and second time it worked. With port zero (where it was connected initially) it 
fails in different manners, like 
1.ahci0.0: <skipped> ci 00004014
2.alignment fault while in user mode (screen filled with garbage)
3.hangs (I waited for 5 minutes).

It's late here, so I'm going to sleep now and will continue my experiments 
tomorrow.

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<http://bugs.dragonflybsd.org/issue1449>
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