NetBSD installation on Sun Ultra 10

Hi,

i can't boot the install cd on my Ultra 10. It seems to have problems
with the IDE controller or the CRD-8322B drive:

[] wd0 ata atabus0 drive 0
[] wd0: <WDC WD800JB-00FSA0>
[] wd0: 76319 MB, 155061 cyl, 16 head, 63 sec, 512 bytes/sect x 156301488 sector
s
[] atapibus0 at atabus1: 2 targets
[] cd0 at atapibus0 drive 0: <CRD-8322B, 1998/09/24, 1.05> cdrom removable
[] WARNING: 2 errors while detecting hardware; check system log.
[] wdc_atapi_intr: bad data phase DATAOUT
[] cmdide0:1:0: reset failed
[] cmdide0:1:0: unbusy timed out
[] cmdide0:1:0: reset failed
[] cmdide0:1:0: unbusy timed out
...
(conitinues and the install system never comes up)

This error can be found on mailing lists dating back to NetBSD 5 / 2009.

But there are people running NetBSD on the Ultra 10.
So what is the solution? Do i have to use a different kernel or a
different cdrom?

Regards,
Connor