Re: [rfc][patch] ide: fix unneeded LBA48 taskfile registers access

[Jeff Garzik]

FWIW, there are two limitations of libata in this area:

1) ISTR some PATA vendor-specific commands have a very specific set of 
input and output registers to use, and input/output sets of registers 
may differ from each other.

2) libata is lazy, and just reads registers in "groups":  the 
lbaH/M/L/nsect registers, the device register, etc.


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