Hi,
Reco wrote:
> $ qemu-system-mips -m 2048 -nographic
> -cdrom /tmp/debian-7.4.0-mips-netinst.iso -boot d
> qemu-system-mips: Could not load MIPS bios 'mips_bios.bin', and no -kernel
> argument was specified
Oops. I did not expect it to die so early.
> Also, that 'iso' is no way a conventional ISO9660 or UDF image:
> $ file -sL /tmp/debian-7.4.0-mips-netinst.iso
> /tmp/debian-7.4.0-mips-netinst.iso: SGI disk label (volume header)
Oh, it is. But it is also a bit more than that.
It's only that the programmers of "file" did not account for that
combination as much as they did with x86 isohybrids:
$ file debian-9.3.0-amd64-netinst.iso
debian-9.3.0-amd64-netinst.iso: DOS/MBR boot sector ISO 9660 CD-ROM
filesystem data 'Debian 9.3.0 amd64 n' (bootable); partition 2 : ID=0xef,
start-CHS (0x3ff,254,63), end-CHS (0x3ff,254,63), startsector 3760,
832 sectors
With the mips ISO, we have to combine file's report with info like this
$ isoinfo -i debian-7.4.0-mips-netinst.iso -d
CD-ROM is in ISO 9660 format
System id:
Volume id: Debian 7.4.0 mips 1
Volume set id:
Publisher id:
Data preparer id: XORRISO-1.2.6 2013.01.08.103001, LIBISOBURN-1.2.6,
LIBISOFS-1.2.6, LIBBURN-1.2.6
Application id:
Copyright File id:
Abstract File id:
Bibliographic File id:
Volume set size is: 1
Volume set sequence number is: 1
Logical block size is: 2048
Volume size is: 105591
Joliet with UCS level 3 found
Rock Ridge signatures version 1 found
xorriso can tell about the MIPS Volume Header which it created on demand
of debian-cd:
$ xorriso -report_about warning -indev debian-7.4.0-mips-netinst.iso \
-report_system_area plain
System area options: 0x00000004
System area summary: MIPS-Big-Endian
ISO image size/512 : 422364
MIPS-BE volume dir : N Name Block Bytes
MIPS-BE boot entry : 1 r4k-ip22 63436 10876928
MIPS-BE boot path : 1 /install/r4k-ip22-boot.img
But i guess it will be hard to determine which machines react on this.
My cheat sheet for boot sectors says
MIPS Volume Header
for MIPS Big Endian, e.g. SGI Indigo2
Sources:
cdrkit-1.1.10/genisoimage/boot-mips.c
by Steve McIntyre <st...@einval.com>
which refers to
genisovh by Florian Lohoff <f...@rfc822.org>
and Thiemo Seufer <seu...@csv.ica.uni-stuttgart.de>
who seem to have learned parameter settings from IRIX CD media
There are traces in the web which relate this to specs by
MIPS Computer Systems, Inc. , 1985
Silicon Graphics Computer Systems, Inc. , 2000
Mail conversations with Natalia Portillo.
Have a nice day :)
Thomas
