Re: question about boot time drive initialization

[Tejun Heo <htejun@gmail.com>]

saeed bishara wrote:
>> Hmmm.. weird.  That's not what I'm seeing.  AHCI reports command issue
>> failure if something goes wrong while transmitting D2H fis for a command
> you mean H2D, don't you?

Yeap.

>> (probably when it sees R_ERR).  If I issue SRST shortly after power-on,
>> AHCI fails SRST due to command issue failure.  So, it seems that the
>> device rejects SRST before it transmits the first FIS34.
> 
> there is also the possiblity that the AHCI doesn't issue the FIS34 as
> long as the BSY bit in the Status shadow register is set. so it's not
> the disk fault. I have taken a look at the AHCI spec, and found that
> you need to use the Commnad List Override (CLO) feature in order to
> send FIS while BSY is set. do you use that ?

AHCI driver does CLO if necessary before issuing SRST, so I don't think 
CLO is the issue here.

-- 
tejun