question regarding ncq implementation

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Hey guys,
   Over the past few days i've been trying to work on modifying the
AHCI driver for an experimental research operating system to support
NCQ. I already have a fully functional AHCI driver without command
queuing. But when i try to  READ FPDMA QUEUED command instead of the
READ DMA command, i get an interrupt with the P0IS register containing
the mask 0x45000008 (TFES, OFS and SDBS bits set). On dumping the log
page, i get 41h as status (DRDY and ATA_ERR if i am right)  and 84h as
feature/error. The non-ncq driver works just fine without any issues
and there is absolutely no way the hardware is at fault this time. I
have checked out the linux code and a 84h error refers to the ICRC and
ATA_ABORTED bits if i am not mistaken. I would really appreciate any
help from devs regarding how to debug this issue further. Also, are
any of the other values i get back from REAL LOG EXT useful for
debugging? If so, how do i interpret them?  I know this is not a linux
related question. So if you think i should be targeting a different
mailing list, i'd really appreciate it if you could please point me in
the right direction and i'll definitely stop bugging you guys.
Thanks in advance,
Raj
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