Minix booting on a Prisma

The output below is from the RS-232 console of my Prisma showing the initial startup messages from the monitor ROM, the Minix boot sequence and the output from some of the commands when the system is running. Some points to note are:

The 'netboot' command always fails even though it has successfully loaded the kernel boot image. This is almost certainly because I am not sending the right magic numbers at the end of the transfer but since it doesn't stop anything working, I haven't investigated it.
I use the 'd0' register as a way of passing debug flags to the kernel. Setting it to 0x1000 enables output to the RS-232 port. Without this, output goes only to the graphics display.
The register display shows the initial values before jumping to kernel entry point at 0x400000 (the base of DRAM).
The kernel startup messages include some extra information to help with debugging.
The startup file '/etc/rc' has been modified to break out into a shell at two points. This was done to help with debugging the network startup and login processes. Both of these are now working but I have left the breakpoints in for now just in case I need them again.
The 'ps' command needs to have its stack increased before it will work. At some point I will update the copy in the ramdisk image so I don't have to keep fixing it at run time.

ISICAD Graphics Controller Firmware,
33385-001 Rev: G, 7-Feb-91, Version 4.02
33 Mhz processor speed
Floating Point Coprocessor Present
cache on
SRAM Test OK
Video Buffer #1 - p/n 33500, 1280x1024, 64kX4
4 Mb DRAM from 00400000 to 007FFFFC 
DRAM Test OK
Clearing DRAM
Parity Error Flag Cleared.
Network Internal Loopback Test OK
Network External Loopback Test OK
Network Collision Retry Test OK
Network SIA/Transceiver Collision Detect Test OK

04/27/99 21:58:57 
Valid Network Address: 0000E900013C 
OSI device at 120000, device <ethlan0>, MAC <0000e900013c>
Cannot connect because: Boot server not running on remote machine
No default boot machine in setups

>>>netboot
OSI Version 4 bootstrap
Valid Network Address: 0000E900013C 
OSI device at 120000, device <ethlan0>, MAC <0000e900013c>
Booting from 490001ae555300124700
    lsdlt: ccb (4ab0) ccb->dest_ccb = NULL, ppi = (nm), port = (down)
boot failed

>>>reg d0
0001F7F8 01000
>>>reg

d0-d7:00001000 00000400 0000000C 00000000 00000000 00000000 00000000 00020000 
a0-a7:001A0010 000003FC 00180000 00100A69 00000000 0010071A 0040ACBC 0001FFF8 
cacr:00000001 caar:43556E75 vbr:00000000 sfc:07 dfc:07 
pc:00100406 sr:2700 sp:0001FFF8 usp:0001F7F8 isp:0001FFF8 msp:0001FBF8 

>>>go 400000
      task         base size   PC     SP
 -8 (         TTY) 0400 0015 403510 40e338
 -7 (      PR7990) 0400 0015 4079a0 40e738
 -6 (      SYN_AL) 0400 0015 402ec4 40e938
 -5 (        IDLE) 0400 0015 401078 40eb38
 -4 (      MEMORY) 0400 0015 4031d6 40ef38
 -3 (       CLOCK) 0400 0015 402a34 40f338
 -2 (         SYS) 0400 0015 4019fe 40f738
 -1 (     HARDWAR) 0400 ffffffff 000000 40f738
  0 (          MM) 0415 000e 415000 000000
  1 (          FS) 0423 0012 423000 000000
  2 (        INET) 0435 0032 435000 000000
main: ramdisk base = 46a000, size = 0f0000, free mem = 2a6000
rs_init: line=0, SIO addr=1a0000
rs_init: line=1, SIO addr=1a0010
Minix 2.0.2  Copyright 1998 Prentice-Hall, Inc.

pe_init: MAC addr = 00:00:e9:00:01:3c, init_block location = 010000 - 017958
osdep_eth_init: no ethernet device at task=-7,port=1
KERN: m_ioctl: ramdisk: dv_base = 55a000, dv_size = 0f0000

Memory size = 4096K   MINIX = 424K   RAM disk = 960K   Available = 1752K

Entering 1st single user mode - hit ctrl-D to continue startup.
# ^D
# Continuing startup...
/usr/bin/ps: Stack+malloc area changed from 28352 to 58352 bytes.
Starting standard daemons: update.
Starting network daemons:  nonamed.
Starting network services: ftp.

This is an experimental version of Minix 2.0 for the IsiCAD Prisma.
Entering 2nd single user mode - hit ctrl-D to continue startup.
# ^D
# Startup finished, spawning getty...

Minix  Release 2.0 Version 0

prisma login: root
# cd /usr/bin
# chmem +20000 ps
ps: Stack+malloc area changed from 58352 to 78352 bytes.
# ps ax
proc=410bb6, mproc=41c90a, fproc=431b7c
nr_tasks=8, nr_procs=64, init_proc_nr=3
  PID TTY  TIME CMD
    0   ?  0:01 TTY
    0   ?  0:00 PR7990
    0   ?  0:00 SYN_AL
    0   ?  0:18 IDLE
    0   ?  0:00 MEMORY
    0   ?  0:00 CLOCK
    0   ?  0:01 SYS
    0   ?  0:02 HARDWAR
    0   ?  0:00 MM
    0   ?  0:02 FS
    0   ?  0:00 INET
    1   ?  0:00 INIT
   45   ?  0:00 -sh
   15   ?  0:00 update
   25   ?  0:00 nonamed
   36   ?  0:00 tcpd ftp /usr/bin/in.ftpd
   46   ?  0:00 getty
   50   ?  0:00 ps ax
# cd /
# ls -CR
.ellepro.b1  .exrc  .profile  bin  dev  etc  minix  mnt  root  tmp  usr

bin:
M  U  [  cat  date  echo  expr  false  printroot  pwd  sh  sync  test  true

dev:
PS0   cd2c     eth    hd1   hd3c  hd7   hd9c   ps0    sd1   sd3c  sd7   sd9c
PS1   cd2d     ether  hd1a  hd3d  hd7a  hd9d   ps1    sd1a  sd3d  sd7a  sd9d
at0   cd3      fd0    hd1b  hd4   hd7b  ip     ptyp0  sd1b  sd4   sd7b  tcp
at1   cd3a     fd0a   hd1c  hd4a  hd7c  kmem   ptyp1  sd1c  sd4a  sd7c  tty
cd0   cd3b     fd0b   hd1d  hd4b  hd7d  log    ptyp2  sd1d  sd4b  sd7d  tty00
cd1   cd3c     fd0c   hd2   hd4c  hd8   lp     ptyp3  sd2   sd4c  sd8   tty01
cd1a  cd3d     fd0d   hd2a  hd4d  hd8a  mem    qd0    sd2a  sd4d  sd8a  ttyc1
cd1b  cd4      fd1    hd2b  hd5   hd8b  nrst4  qd1    sd2b  sd5   sd8b  ttyp0
cd1c  cd4a     fd1a   hd2c  hd6   hd8c  null   qh0    sd2c  sd6   sd8c  ttyp1
cd1d  cd4b     fd1b   hd2d  hd6a  hd8d  pat0   qh1    sd2d  sd6a  sd8d  ttyp2
cd2   cd4c     fd1c   hd3   hd6b  hd9   pat1   ram    sd3   sd6b  sd9   ttyp3
cd2a  cd4d     fd1d   hd3a  hd6c  hd9a  pc0    rst4   sd3a  sd6c  sd9a  udp
cd2b  console  hd0    hd3b  hd6d  hd9b  pc1    sd0    sd3b  sd6d  sd9b

etc:
ethers  hostname.file  motd    profile    rc.net    shadow   utmp
fstab   hosts          mtab    protocols  rc.tnet   termcap
group   issue          passwd  rc         services  ttytab

minix:

mnt:

root:

tmp:

usr:
adm  ast  bin  lib  spool  tmp

usr/adm:

usr/ast:
.ashrc  .profile

usr/bin:
chmem  cpdir     ifconfig  login  mt       ping     sleep  telnet
chmod  ftp       in.ftpd   ls     mv       ps       stty   time
clone  getty     kill      md     nonamed  rm       su     tty
cp     hostaddr  ln        mkdir  passwd   seltest  tcpd   update

usr/lib:
pwdauth

usr/spool:
uucp

usr/spool/uucp:

usr/tmp:
# ping escore
escore is alive
#

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