Re: LIBATA AHCI engine timeout hang with ATAPI devices

[Eric A. Cottrell]

Jeff Garzik wrote:
> You need something like the attached patch.
>
> In general, ATAPI is still very much experimental at this point.  One 
> known bug that affects libata is that ATAPI DMA is not aligned to a 
> 4-byte boundary.
Hello,

Thanks.

I already have that patch applied.  I will poke around the code over the weekend and see if I can figure out the problem.
I am alittle rusty as my last disk driver code was modifying Heathkit CPM BIOS to support a SMS SASI board for 8 inch floppies and 
Shugart SA1000 series hard drives!

I would like to help get ATAPI to work as I suspect more SATA ATAPI stuff will appear as motherboards use SATA.  It appears that the 
ahci/libata code is missing some needed steps that the ata_piix/libata code does.  Looking at the code and patches I can see that 
libata had to change to permit the hardware to perform tasks that libata did.

Thank you for your web page on IDE drives.  I downloaded alot of specs and even read a small bit of them.

73 Eric eac@xxxxxxxxx
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