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Re: Format of bootable Indy CDs?

To: Florian Lohoff <>
Subject: Re: Format of bootable Indy CDs?
From: Alex deVries <>
Date: Fri, 27 Sep 2002 12:22:32 -0400
Organization: Linuxcare
Original-recipient: rfc822;
References: <> <>
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020408


Cool! As soon as I can find a 512-byte ro CDROM, I'll try this.

I've got part of mkefs working, BTW, which I realize is not required to make bootable CDs, but might be helpful anyway.

- Alex

Florian Lohoff wrote:
On Thu, Sep 26, 2002 at 03:32:26AM -0400, Alex deVries wrote:

I'm curious about the possibility of making a Linux installer for the Indy that boots from CD; is there any description of the format of bootable IRIX CDs out there? What does the firmware expect?

I know that sash is involved somehow...

Ok - i reworked the procedure a bit whil beeing in Oldenburg.

flo@split:~/projects/boot$ mkisofs -J -R -V testboot -o iso
Total translation table size: 0
Total rockridge attributes bytes: 262
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 6644
2208 extents written (4 Mb)
flo@split:~/projects/boot$ isoinfo -l -R -i iso

Directory listing of /
dr-xr-xr-x   2 1750 1750             2048 Sep 27 2002 [    28]  .
?---------   0 1750 1750             2048 Sep 27 2002 [    28]  ..
-rwxr-xr-x   1 1750 1750          4414116 Sep 12 2002 [    31] 
flo@split:~/projects/boot$ echo $[ 31 * 4 ]
flo@split:~/projects/boot$ genisovh-0.1/genisovh iso sashARCS:124,4414116 

The last command adds a "volume header" in the first 512 byte into the
iso file. This volume header spans the whole iso filesystem and lists 2
files at identical positions which is the ECOFF tftpboot-r4k-ip22.img.
The name sashARCS is coded in the Indys prom for the installer when
using your mouse and "Install System Software" and "Local cdrom".

Now one needs to write a wrapper for the Indy bootfloppys aka debian-cd
to produce bootable cds.

I put up the stuff:


Alex deVries
Principal Architect, Linuxcare Canada, Inc.
(613) 562 2759

Linuxcare. Simplifying Server Consolidation.

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