Comment 47 for bug 198871

Same problem on lucid lynx alpha2.
Motherboard ASRock P55 Pro, which has JMB363 PCIe. If it's turned on I have:

$ dmesg | grep ata2
[ 0.852604] ata2: SATA max UDMA/133 abar m8192@0xf7ffe000 port 0xf7ffe180 irq 19
[ 1.201805] ata2: SATA link down (SStatus 0 SControl 300)
[ 1.223457] ata2: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen t4
[ 1.223459] ata2: irq_stat 0x00000040, connection status changed
[ 1.223460] ata2: SError: { DevExch }
[ 1.223463] ata2: hard resetting link
[ 1.970649] ata2: SATA link down (SStatus 0 SControl 300)
[ 1.970720] ata2: EH complete
[ 2.097664] ata2: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen
[ 2.097746] ata2: irq_stat 0x00000040, connection status changed
[ 2.097802] ata2: SError: { DevExch }
[ 2.097858] ata2: limiting SATA link speed to 1.5 Gbps
[ 2.097913] ata2: hard resetting link

-------------------- CUT (same errors) ----------------------------------

[ 125.105961] ata2: COMRESET failed (errno=-32)
[ 125.105969] ata2: reset failed (errno=-32), retrying in 8 secs
[ 132.741690] ata2: hard resetting link
[ 135.127255] ata2: COMRESET failed (errno=-32)
[ 135.127263] ata2: reset failed (errno=-32), retrying in 8 secs
[ 142.723036] ata2: hard resetting link
[ 145.068657] ata2: COMRESET failed (errno=-32)
[ 145.068665] ata2: reset failed (errno=-32), retrying in 33 secs
[ 177.657790] ata2: hard resetting link
[ 179.923576] ata2: COMRESET failed (errno=-32)
[ 179.923583] ata2: reset failed, giving up
[ 179.923588] ata2: EH complete

But if I disable it in BIOS (It's called "eSATAII & IDE1" there), I get only:

$ dmesg | grep ata2
[ 0.859005] ata2: SATA max UDMA/133 cmd 0xa880 ctl 0xa800 bmdma 0xa488 irq 19
[ 1.560790] ata2.00: SATA link down (SStatus 0 SControl 300)
[ 1.560861] ata2.01: SATA link down (SStatus 0 SControl 300

And sometimes my system just hangs during the boot (when controller was turned on)