I think I know why my kernel can't find the root device, but I'm not sure
how to fix it.

The OF tree for Sonnet ATA-100 and ATA-133 cards (which use a Promise
chipset and UltraTek firmware) looks approximately like this:

/UltraTek100+
  /FrmTk-0@10,0
    /sd@0
  /FrmTk-0@11,0
    /sd@0

The top level ("UltraTek100+") has a "device_type" property of "scsi", while
the second level ("FrmTk-0") has a "device_type" property of "ata".

I suspect that the code in device_register() that matches up OF device tree
nodes with the kernel's idea of devices can't cope with an extra layer in
the OF tree between the pciide controller and the drive(s).

Does this sound plausible?

If so, how might one work around this problem without committing an
egregious hack?

Thanks,
-- monroe
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Monroe Williams                                         monroe@pobox.com