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

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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