Testing original ROM on g3 machine

[Andrew Randrianasulu]

I tried to use NetBSD's install instruction and it seems that at least
v2.0 rom only supports internal MESH (SCSI) controller to boot from ?

https://cdn.netbsd.org/pub/NetBSD/NetBSD-10.1/macppc/INSTALL.html#Installing%20the%20NetBSD%20System
=====

To determine if a device is bootable, type:


0 > dev scsi-int/sd@3
0 > words
load          write        read          seek        close     open
write-blocks  read-blocks  max-transfer  block-size  dma-sync  dma-map-out
dma-map-in    dma-free     dma-alloc
 ok

If the word ``open'' is present in the list, then the device is almost
certainly bootable.

=====

copied from GTK3 qemu window (finally some use for gtk3 interface!)

ok
0 > dev ata-int/disk@0  ok
1 > words

 ok
1 > dev  ok
1 > aliases aliases, unknown word
 ok
0 > devalias
pci                 /pci@80000000
mac-io              /pci/mac-io
kbd                 /pci/mac-io/via-cuda/adb/keyboard
mouse               /pci/mac-io/via-cuda/adb/mouse
screen              /pci/ATY,mach64_3DU
ttya                /pci/mac-io/escc/ch-a
ttyb                /pci/mac-io/escc/ch-b
scsi                /pci/mac-io/mesh
scsi-int            /pci/mac-io/mesh
ide0                /pci/mac-io/ide@20000
ide                 /pci/mac-io/ide@20000
ata-int             /pci/mac-io/ide@20000
ide1                /pci/mac-io/ide@21000
enet                /pci/mac-io/bmac
swim                /pci/mac-io/swim3
fd                  /pci/mac-io/swim3
 ok
0 > dev ide1/disk@0  ok
1 > words

 ok
1 > dev scsi-int  ok
1 > ls

Children of the node:
FF835330: /mesh@10000                  [mesh]

Node Adr    Node Name                     Compatible

FF836E58: /sd@0,0                      [sd]
FF837A68: /st@0,0                      [st]
 ok
1 > show-children
DEFAULT CATCH!, code=FFF00300 at   %SRR0: FF8091A8   %SRR1: 0000A070
 ok
0 > dev scsi-int/sd@0  ok
0 > words
load            write           read            seek            close
         open
write-blocks    read-blocks     max-transfer    block-size
dma-sync        dma-map-out
dma-map-in      dma-free        dma-alloc
 ok
0 >