Geert Uytterhoeven said:
> On Fri, 23 Jan 2004, Leigh Brown wrote:
>> Geert Uytterhoeven said:
>> > My version of Open Firmware (from Firmworks) didn't like the yaboot
>> loader
>> > and kept rebooting with the message `rebooting with the correct
>> settings
>> > for this client program' (or something like that), until I
>> disconnected
>> > the disk and it couldn't find the boot loader anymore.
>>
>> Interesting. Can you send the output of "printenv" to me, please?
>> Also,
>
> If the device tree is sufficient, you can get it at
> http://home.tvd.be/cr26864/Linux/PPC/DeviceTree.html
I've had a look at this. Yaboot appears to have a different ELF note
section to the kernel. From yaboot's util/addnote.c:
unsigned int descr[N_DESCR] = {
0xffffffff, /* real-mode = true */
0x00c00000, /* real-base, i.e. where we expect OF to
be */
0xffffffff, /* real-size */
0xffffffff, /* virt-base */
0xffffffff, /* virt-size */
0x4000, /* load-base */
};
>From the kernel's arch/ppc/boot/utils/addnote.c:
unsigned int descr[N_DESCR] = {
#if 1
/* values for IBM RS/6000 machines */
0xffffffff, /* real-mode = true */
0x00c00000, /* real-base, i.e. where we expect OF to
be */
0xffffffff, /* real-size */
0xffffffff, /* virt-base */
0xffffffff, /* virt-size */
0x4000, /* load-base */
#else
/* values for longtrail CHRP */
0, /* real-mode = false */
0xffffffff, /* real-base */
0xffffffff, /* real-size */
0xffffffff, /* virt-base */
0xffffffff, /* virt-size */
0x00600000, /* load-base */
#endif
So if you edit yaboot's addnote to use the second definition above,
yaboot might have a better chance of working on your machine. It would
be nice if a single note section would support RS/600 and longtrail,
but that might require a bit of experimentation (if it can be made to
work at all).
>> can the longtrail boot from CD's? Does it use the same disk format as
>> RS/6000's to do so?
>
> Should work, as long as you have a supported file system on it (e.g.
> ISO9660).
>
> I never tried booting from CD, but I once did an `ls' on a CD, and it
> worked. So far I only booted from floppies, SCSI disks, and IDE disks
> (all from a file in a FAT partition).
It would be great if we can make a CD image that boots on PReP, RS/6000
CHRP, Longtrail and Macs.
