IDE disk boot disk for Netra T1

The Netra T1 has an CMD604 IDE controller. Max Ultra DMA2.
Sun has only placed one 44pin IDE header on-board. I am quire sure you could solder a second IDE header on (see the image below), I would not suggest this the 604 has known issues with sending simultaneous DMA requests to each channel.

The header is a standard 40pin header + 4 pin power, so exactly the same as your standard laptop HDD. Sun originally placed this here for you to use a CD-ROM in the Netra via a special “paddle board” that are extremely hard to find!  In all realty we can build our own, but why would you want a CD-ROM when netboot wins!

In order to cut power requirements and to lower the noise level, I wanted to remove the two 9gb SCSI 10k rpm drives. I do not need redundancy nor do I need the speed.

Here is a image of the header in question :-

IDE Header

I brought a 30cm 44pin cable off eBay. You need to file down the sides of the plug to fit into the header, apart from that its 100% pin computable. Pin1 is really pin1.
I placed the IDE laptop HDD over the back SCSI port board as it was a nice snug fit and required no modification to keep the disk in place.
You can see the disk on top on the SCSI IO backplane here, please note I did insulate the disk bottom:-

HDD Location

The OpenPROM on the Netra will detect the disk without an issue.
It will not by default boot to it, nor is there a pre existing boot alias

You must set up an alias for the Netra to boot from the IDE disk.
Do the following at the “ok” prompt:-
(Note you can change BSD to what ever you like)

  • nvalias BSD /pci@1f,0/pci@1/pci@1/ide@e/disk@2,0

Now you can boot the system via

  • boot BSD

Done :) So now we can boot from an IDE, slow but power efficent and also quite.


One Response to “IDE disk boot disk for Netra T1”

  1. Just wish to say your article is as astounding.
    The clarity for your post is simply nice and that i can suppose you’re
    a professional on this subject. Well along with your permission allow me to clutch your RSS feed to keep up to
    date with approaching post. Thanks 1,000,000 and please continue the
    rewarding work.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: