On Fri, 2007 Aug 31 00:46:11 -0400, Rod Ross wrote:
> >
> > ? Or would you have to use a Mac-compatible partitioner first, and write 
> > the .iso to the first partition?
> >   
> You my use the whole disk such as /dev/hdb. This would be the debian 
> etch netinstall iso or business card iso. Doing this only "fakes" a 
> cdrom device. I do not recommend booting from the same device and using 
> a separate partition on that same device as the partition containing the 
> debian netinstall or business card iso as the ramdisk boot installer. It 
> might work since ybin or yaboot or quik are not installed. Not sure of 
> command sequence for miboot boot loader but I would guess it would have 
> problems . I have tried this "fake" cdrom on a Alpha with etch and it 
> works. If you have a netinstall that you can boot than you are set you 
> can just dd that to the boot disk drive and install to the other one. 
> But if the image will not boot you might have problems. Use "dd 
> if=/dev/zero of=/dev/hdb" to zero data on the disc if you experience 
> problems with the disc you wrote to.

I only have one disk, so it would be /dev/hda, and I would have to 
install to the same disk that the machine boots from. Should this work? 
As I understand, once everything is loaded, the system runs in RAM---so 
the original HFS partition (with the content of the .iso) can be blown 
away without a problem.

> http://penguinppc.org/bootloaders/ 
> <http://penguinppc.org/bootloaders/#bootx>
> Great read for open firmware macs
> http://www.alaska.net/~erbenson/doc/netboot.html 
> <http://www.alaska.net/%7Eerbenson/doc/netboot.html>

Ah, but my machine is an Old World Mac. No OF at all....

> TFTP is normally implemented in Open firmware. Several archs, ports or 
> whatever you want to call different computers allow TFTP from the BIOS. 
> Such as my SGI Indy and my Alpha PWS have TFTP clients built into the 
> ROM . When you get into closed firmware such as on the your PB1400 or my 
> 3 nubus (really it is PDS) powermacs TFTP would need to be started after 
> a kernel has already loaded thus defeating the purpose.

TFTP would be used to pull down an initrd/RAM-rootfs, after booting the
kernel from a floppy. (So it's the kernel that does the TFTP request,
not a machine ROM.) This is because the kernel can use the network
device, but not the floppy drive (so a root floppy is impossible).

> Perhaps what you are really looking for is a ram disk install image
> with network capabilities built in, basically a netinstall you can
> boot. Booting being the plus.

Well, that would require driving the network device before the kernel is 
loaded. On PCs, this can be handled by the BIOS and a boot ROM on the 
network interface. Here, however, we have neither :(


--Daniel

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