SPARCClassic won't boot cdrom

Jerry Kemp other at
Mon Aug 3 16:11:43 CDT 2015

To the OP.

 From the OK OBP prompt, can you please share the output of:




assuming your OBP supports those commands.


On 08/ 2/15 04:35 PM, Sean Caron wrote:
> Oh! And if you're using the "boot cdrom" mnemonic, make sure that your
> CD-ROM is actually set to SCSI ID 6, otherwise you need to substitute in
> your boot path i.e.
> /iommu/sbus/espdma at 4,8400000/esp at 4,8800000/sd@{scsiid},0
> Definitely check that!
> Best,
> Sean
> On Sun, Aug 2, 2015 at 2:53 PM, Michael Thompson <
> michael.99.thompson at> wrote:
>>> From: Benjamin Huntsman <BHuntsman at>
>>> Subject: SPARCClassic won't boot cdrom
>>> Hi all!
>>>     I recently acquired a SPARCclassic, which is my first bit of Sun
>>> hardware.  Having an awful time getting it to boot from the CD-ROM.  I
>> have
>>> tried a bunch of different terminators and several different cables, but
>>> whenever I try to boot I get this:
>>> ok boot cdrom -s
>>> Boot device: /iommu/sbus/espdma at 4,8400000/esp at 4,8800000/sd at 6,0:d  File
>>> and args: -s
>>> The SCSI bus is hung.  Perhaps an external device is turned off.
>>>     Any ideas as to what might be wrong here?  The thing does not seem to
>>> send any commands to the CD-ROM, as the LED never comes on and I don't
>> hear
>>> it doing anything...
>>> Thanks!
>>> -Ben
>> The terminator on the end of the SCSI bus needs to be powered. Without
>> power on the terminator the bus will hang. Sometimes the power comes from
>> the SPARC through the SCSI cable, but not all SCSI cables pass the power.
>> Sometimes there is a jumper or switch on the last drive to enable SCSI
>> terminator power.
>> --
>> Michael Thompson

More information about the cctech mailing list