[Bug 576601] Re: [MacBookPro 7, 1]mcp89 sata link reset fails, no disks detected

[tschinke]

@Koen Calliauw 
as mentioned in https://bugzilla.kernel.org/show_bug.cgi?id=15923 the problem is that the ata_generic driver uses only PIO mode instead of DMA mode (look at "dmesg | grep ata",  there are messages like ata1.00: configured for PIO). However it is stated to be possible to drive the disks in DMA mode by patching the driver. In conclusion to the description above this should the be in ata_generic.c, around line 53 (bits 5 and 6 are false and therefore flags checked in line 63 won't work either). 

It would be very nice if Dave could update his image, so we could test
this approach if it works.

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[MacBookPro 7,1]mcp89 sata link reset fails, no disks detected
https://bugs.launchpad.net/bugs/576601
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