G5 nvram

[root@g5 ~]# nvram --partitions
 # Sig Chk  Len  Name
 0  5a  82  0002 nvram
 1  5f  45  003e system
 2  70  bd  00c1 common
 3  a0  1e  0052 APL,MacOS75
 4  7f  c6  00ad wwwwwwwwwwww

[root@g5 ~]# nvram  --dump nvram
0x00000000  5a820002 6e767261 6d000000 00000000 |Z...nvram.......|
0x00000010  adc63822 000003f2 00000000 00000000 |..8"............|

[root@g5 ~]# nvram  --dump system
0x00000000  5f45003e 73797374 656d0000 00000000 |_E.>system......|
0x00000010  00020000 63617368 00000000 00000000 |....cash........|
0x00000020  00000000 00000000 00000000 00000000 |................|
0x00000030  00000000 00000000 00000000 00000000 |................|
0x00000040  00000000 be2d237d 00000000 00000000 |.....-#}........|
0x00000050  00000000 00000000 00000000 00000000 |................|
0x00000060  325a3639 342d3530 37320000 00000000 |2Z694-5072......|
0x00000070  53505900 00000000 00000000 00000000 |SPY.............|
0x00000080  00000000 00000000 00000000 00000000 |................|
...
0x00000120  00000000 00000000 00000000 00000000 |................|
0x00000130  00000000 00000000 434b3530 35484e44 |........CK505HND|
0x00000140  53505900 00000000 00000000 00000000 |SPY.............|
0x00000150  00000000 00000000 00000000 00000000 |................|
...
0x000003c0  00000000 00000000 00000000 00000000 |................|
0x000003d0  00000000 00000000 00000000 00000000 |................|

[root@g5 ~]# nvram --print-config
"common" Partition
---------------------
little-endian?=false
real-mode?=false
auto-boot?=true
diag-switch?=false
fcode-debug?=false
oem-banner?=false
oem-logo?=false
use-nvramrc?=false
use-generic?=false
default-mac-address?=false
scroll-lock=true
skip-netboot?=false
real-base=-1
real-size=-1
load-base=0x800000
virt-base=-1
virt-size=-1
logger-base=-1
logger-size=-1
pci-probe-mask=-1
screen-#columns=100
screen-#rows=40
selftest-#megs=0
boot-screen=screen
console-screen=screen
diag-device=enet
diag-file=,diags
input-device=keyboard
output-device=screen
input-device-1=scca
output-device-1=scca
mouse-device=mouse
oem-banner=
oem-logo=
nvramrc=
boot-command=mac-boot
default-client-ip=
default-server-ip=
default-gateway-ip=
default-subnet-mask=
default-router-ip=
boot-script=
aapl,pci=
boot-args=
aapl,tdm-units=
boot-volume=2
boot-file=grub
boot-device=hd:,grub
ram-size=0x18000000
boot-last-label=setparams 'Fedora 25 (Twenty Five)'

        load_video
        insmod gzio
        insmod part_apple
        insmod ext2
        set root='hd0,apple3'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//ht@0\,f2000000/pci@7/k2-sata-root@c/disk@0,apple3' --hint-bios=hd0,apple3 --hint-efi=hd0,apple3 --hint-baremetal=ahci0,apple3  26507748-8918-49e0-9d3e-8e8c7b3da04d
        else
          search --no-floppy --fs-uuid --set=root 26507748-8918-49e0-9d3e-8e8c7b3da04d
        fi
        linux /vmlinuz-4.10.8-200.fc25.ppc64 root=UUID=46026799-c14a-4ae0-98fd-d5d70cd21c4c ro video=DVI-I-1:d video=DVI-I-2:1024x768@60 video=TV-1:d nomodeset 
        initrd /initramfs-4.10.8-200.fc25.ppc64.img


[root@g5 ~]# cat /etc/default/grub
GRUB_TIMEOUT=10
GRUB_CMDLINE_LINUX="video=DVI-I-1:d video=DVI-I-2:1024x768@60 video=TV-1:d nomodeset"
#GRUB_TERMINAL=ofconsole
GRUB_TERMINAL_INPUT="ofconsole console"
GRUB_TERMINAL_OUTPUT="ofconsole console"