Re: libata machine check on Alpha

[Albert Lee <albertcc@tw.ibm.com>]

Tejun Heo wrote:
> Jeff Garzik wrote:
> 
>> Albert Lee wrote:
>>
>>> Per Jeff's comment, there is a document on t13
>>> (http://www.t13.org/docs2003/e03131r0.pdf).
>>> The documents reads:
>>> "Eg. – Word 50, bit 13: Set to 1 for devices that support DMAIN bit
>>> in Features Register for Packet Command".
>>> However, this looks more for the ATAPI device than for the bridge?
>>> Also it looks not a t13 standard yet?
>>> Can we use this word 50 to identify 3611/3811?
>>
>>
>>
>> DMADIR is in my copy of ATA-7...
>>
> 
> Here's the relavant part from ATA8 draft.  It seems that the bridge is
> supposed to mangle the IDENTIFY PACKET DEVICE result.  It's supposed to
> nuke all DMA transfer mode information reported from the original device
> and report supported modes from the view point of the bridge in bits
> 10:1 (which, BTW, should be all 1's).
> 
> The question is whether or not bridges implement this properly. I think
> we can add a printk to word 62 and ask Jonathan to test it.
> 

Ah, thanks for the info. The DMADIR is in my copy ATA-7, too.
I just checked word 50 and overlooked it. :(
I should have checked other part of the spec...

Anyway, will try to make a patch based on the ATA-7 spec.
--
Albert