[issue1449] AHCI panic on Intel 6321ESB AHCI

[Thomas E. Spanjaard]

Matthew Dillon wrote:
> :Alexander Polakov <polachok at gmail.com> added the comment:
> :
> :I changed value to 1000 on line 143 and added ahci_os_sleep(1000) before re=
> :turn=20
> :in ahci_init. Still panics.
> 
>     Rumko is now getting a panic with a AHCI1.0 Intel chipset with the
>     changes that he was NOT getting before the changes.
> 
>     The results are very similar to what you got... what appears to be
>     random memory corruption and in Rumko's case an immediate machine
>     reboot and the BIOS configuration got messed up as well.
> 
>     I feel they must be related issues.  If Rumko and I can figure out
>     which change caused his machine to stop booting it may give me a
>     good idea where to look for the problem you are reporting.
> 
>     What is really annoying to me is that the NATA driver is able to
>     attach with its AHCI sub-driver.  I don't know what I am doing
>     different that is causing the breakage.

Perhaps your "if intel but AHCI is not enabled then write some value to
a particular config register" change. I'm thinking there's more work to
do to kick the chip into AHCI mode and not confuse the BIOS; besides
that, I think it's not clean. If the device doesn't advertise itself as
being an AHCI subclass, then don't try to force it.

Cheers,
-- 
	Thomas E. Spanjaard
	tgen at netphreax.net
	tgen at deepbone.net

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