Re: regarding ata_piix initialization trouble

[Tejun Heo <htejun@gmail.com>]

Jeff Garzik wrote:
> Tejun wrote:
> 
>> Hello, Jean & 0602.
>>
>> I was digging ICH docs to reimplement ata_piix initialization and 
>> found out that 6300ESB lists high bits (the present bits) of PCS 
>> register as reserved. But they indiciate that the bits might change 
>> anytime just as in other docs. I think something went wrong with those 
>> bits in that particular chipset and Intel decided to ignore the bits.
>>
>> I'm wondering whether your problems are related to this. Can you guys 
>> please run 'lspci -n' on your machines which had the piix 
>> initialization trouble and report the result here?
> 
> 
> Note that we still get the PCS bits wrong because, e.g. they only apply 
> to ports 0 and 2 on some chipsets, not ports 0 and 1 like you would expect.
> 

Jeff, can you please elaborate? I'm currently looking at datasheets for 
ICH5, 6, 7 and 6300ESB but can't really understand what you're saying. 
Doesn't PCS + MAP give the whole picture?

-- 
tejun