RELENG_5 ata doesnt find disk on second channel

Hi, 

I have this
atapci0_at_pci0:9:0:       class=0x01018a card=0x0c111043 chip=0x006510de rev=0xa2
hdr=0x00
vendor   = 'NVIDIA Corporation'
device   = 'nForce MCP2 EIDE Controller'
class    = mass storage
subclass = ATA

ata controller and this <ST380011A/3.06> ATA/ATAPI revision 6 disk attached as
slave on second ata channel. RELENG_5 (few hours old) doesnt detect it. the
disk is working and even bios detects it etc.

I suspect recent changes to ata initialization with respect to broken atapi
devices are about to blame...

at another machine with 6-current (some sis chipset) I failed with disk on
second channel as well but different disk worked. both disks are working.

the hw is 100% ok

roman