[cc'ing libata people]

Hello,

Kjartan Maraas wrote:
quoted text
> Here you go. It shows the error two times and then it gets it right and
> continues to boot. No other problems arise from this that I can see.

Cool, it proves even my code works from time to time if the moon and
stars are perfectly aligned.

quoted text
> ata1.00: ACPI cmd b1/c1:00:00:00:00:a0 failed (Emask=0x1 Stat=0x51 Err=0x04)

Your BIOS wants to issue DEVICE CONFIGURATION FREEZE LOCK but the device
NACKs it probably because the drive doesn't support DCO feature set.

quoted text
> ata1: failed to recover some devices, retrying in 5 secs
> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> ata1.00: ACPI cmd b1/c1:00:00:00:00:a0 failed (Emask=0x1 Stat=0x51 Err=0x04)
> ata1.00: ACPI on devcfg failed the second time, disabling (errno=-5)

libata EH gives ACPI one more chance but it fails again, so ACPI is
turned off.

quoted text
> ata1.00: revalidation failed (errno=1)
> ata1: failed to recover some devices, retrying in 5 secs
> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> ata1.00: configured for UDMA/100

Device is now configured properly.

Your BIOS is probably trying to issue DCO freeze lock to all drives.  I
don't have the faintest idea why it does but it does.  I think there are
several choices here.

1. Ignore device errors for _GTF commands.  Report the failure with
KERN_DEBUG priority and just keep processing.  ISTR there was a patch to
do this.  Anyone knows what happened to it.

2. Filter out certain commands from ACPI.  I definitely don't like BIOS
locking up random features via _GTF commands.  It makes debugging difficult.

3. Look at opcode on failure and ignore error for certain operations.

My favorite is #2 but #1 should be fine too.  Any thoughts?

Thanks.

-- 
tejun
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