First I'm using Windows Vista x64 (yeah yeah, I know.... ) and Qemu 0.12.3
The license file lists the Magnum 4000 firmware as being freeware...
So at any rate, I was able to make a cd image from the 1.5.1 archive, and have ARC Bios boot the ecoff kernel directly, however there is no 'ram disk' in the kernel... so to 'solve' that I used Windows NT to build a system partition, then used the disk image in qemu's i386 emulator to setup the disk using the x86 version of NetBSD 1.5.1. Once the x86 version was going to extract the OS, I hit control Z and then manually untarred the MIPS userland.
Now with that out of the way, I am able to use qemu to boot up into the MIPS stuff... If there is a /netbsd it will crash out the kernel while it's building the databases. The networking doesn't work at all, its pulling all zero's for the MAC address. I tried to 'fix' the device driver to use a mac address that qemu gave Windows NT MIPS, and remove all asserts but to no avail.
NetBSD 5.0.2 starts up ok, but once it starts to extract the setup files, it crashes the kernel with a TLB issue... I'll try to extract it on an i386 and see how that goes.
qemu-system-mips64el -M magnum -L . -hda netbsd.disk -cdrom netbsd151.iso -m 64 -net nic -net user
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001
The NetBSD Foundation, Inc. All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
NetBSD 1.5.1 (GENERIC) #5: Tue Mar 30 20:37:29 PST 2010
root@:/usr/src/sys/arch/arc/compile/GENERIC
MIPS Magnum
total memory = 65536 KB
avail memory = 55492 KB
using 844 buffers containing 3376 KB of memory
mainbus0 (root)
cpu0 at mainbus0: MIPS R4000 CPU (0x400) Rev. 0.0 with software emulated floatin
g point Rev. 0.0
cpu0: L1 cache: 8KB/16B instruction, 8KB/16B data, direct mapped
cpu0: No L2 cache
pica0 at mainbus0
aclock0 at pica0 slot 0 offset 0x0: mc146818 or compatible
lpt0 at pica0 slot 1 offset 0x0
fdc0 at pica0 slot 2 offset 0x0
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
fd1 at fdc0 drive 1: 1.44MB 80 cyl, 2 head, 18 sec
vxl at pica0 slot 4 offset 0x0 not configured
sn0 at pica0 slot 5 offset 0x0: bufsize 28480 address 00:11:cc:00:00:11
asc0 at pica0 slot 6 offset 0x0: NCR53C94, target 7
scsibus0 at asc0: 8 targets, 8 luns per target
kbc selftest: 1d
pckbd at pica0 slot 7 offset 0x0 not configured
pms at pica0 slot 8 offset 0x0 not configured
com0 at pica0 slot 9 offset 0x0: ns16550a, working fifo
com0: txfifo disabled
com0: console
com at pica0 slot 10 offset 0x0 not configured
isabr0 at mainbus0
isa0 at isabr0 isa_io_base 0xe2000000 isa_mem_base 0xe3000000
scsibus0: waiting 2 seconds for devices to settle...
sd0 at scsibus0 target 0 lun 0: <QEMU, QEMU HARDDISK, 0.12> SCSI3 0/direct fixed
sd0: mode sense (4) returned nonsense; using fictitious geometry
sd0: 2048 MB, 2048 cyl, 64 head, 32 sec, 512 bytes/sect x 4194304 sectors
sd1 at scsibus0 target 1 lun 0: <QEMU, QEMU HARDDISK, 0.12> SCSI3 0/direct fixed
sd1: mode sense (4) returned nonsense; using fictitious geometry
sd1: 3665 KB, 3 cyl, 64 head, 32 sec, 512 bytes/sect x 7331 sectors
cd0 at scsibus0 target 2 lun 0: <QEMU, QEMU CD-ROM, 0.12> SCSI3 5/cdrom removable
boot device: <unknown>
root device: sd0a
dump device (default sd0b):
file system (default generic):
root on sd0a dumps on sd0b
sd0: mode sense (4) returned nonsense; using fictitious geometry
sd0: mode sense (4) returned nonsense; using fictitious geometry
sd0: mode sense (4) returned nonsense; using fictitious geometry
sd0: mode sense (4) returned nonsense; using fictitious geometry
sd0: mode sense (4) returned nonsense; using fictitious geometry
sd0: mode sense (4) returned nonsense; using fictitious geometry
sd0: mode sense (4) returned nonsense; using fictitious geometry
WARNING: preposterous clock chip time
19-19-19, 19:19:19
30-30-30, 30:30:30
-- CHECK AND RESET THE DATE!
root file system type: ffs
sd1: mode sense (4) returned nonsense; using fictitious geometry
sd1: no disk label