>>> Alexander Yurchenko <grange@rt.mipt.ru> wrote

> Why you suppose that 0x20 in the FreeBSD's source means ATAPI port? More
> likely it's General Purpose Register, PDC262_SCR_GEN_LAT. Did you try to
> connect your LBA48 drive to the second channel?

No, I tested only the primary channel.

I saw the FreeBSD changes below, and also found the patch for Linux
driver via google with 'promise ultra66 linux lba48'. So, I guessed
it as ATAPI port.

http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/ata/ata-dma.c.diff?r1=1.106&r2=1.107
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/ata/ata-dma.c.diff?r1=1.109&r2=1.110

Takeshi Nakayama