Albert Lee wrote:
Jeff Garzik wrote:
Applied, though I think its an open question what happens with
CDB-interrupt ATAPI devices want to do DMA. Perhaps we just get an
interrupt event that we clear, then life proceeds as normal.
Not sure. I have no such device at hand for test; currently relying
on the SFF-8020i spec (http://www.bswd.com/sff8020i.pdf) as reference.
According to p.31, we have to send out the CDB after receiving
the CDB interrupt. So, just clearing the irq looks not enough.
Does anybody actually have such a device anywhere? :)
Maybe Alan or Mark knows?
We really need tester for such device.
hdparm identifies them with "-I", but libata doesn't allow HDIO_DRIVE_CMD
on ATAPI (yet?), and I've not yet updated hdparm to use SGIO directly.
But I did have such devices here once, like this one below,
from my library of IDENTIFY dumps:
>ATAPI CD-ROM, with removable media
> Model Number: CD-ROM 36X/AKU
> Serial Number:
> Firmware Revision: U10I
>Standards:
> Used: ATAPI for CD-ROMs, SFF-8020i, r2.5
> Supported: CD-ROM ATAPI-1
>Configuration:
> DRQ response: <=10ms with INTRQ
> Packet size: 12 bytes
...
MMmm.. there's even a drive on the shelf here that might
be that exact unit. I'll plug it in and see if it is.
-ml
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