FATAL: system is not bootable, boot command is disabled
Don’t panic!!!
This error indicates that interrupted the boot process prematurely, most likely when the memory checks were run with “STOP + A” or a break from console.
To resolve this problem simply Power OFF and power ON the system. Alternatively, you can perform a “reset-all” from the OK prompt.
This should help!

{1} ok boot cdrom
FATAL: /memory@m0,0: OpenBoot initialization sequence prematurely terminated.
FATAL: system is not bootable, boot command is disabled
Do Like this
{1} ok printenv auto-boot?
auto-boot? = true
{1} ok setenv auto-boot? false
auto-boot? = false
{1} ok reset-all
System will boot in to ok prompt.
Then the issue will dissapper
Thxs a ton ,,, It worked .
Yes, thank you, now that I am at ok, I tried to boot cdrom, but keyboard is now not in sync; I get a “c” or = non-stop scrolling? not sure how to get past this
I got the same error .fatal error .boot is disabled.then i make the auto-boot to false and gave reset-all .But this resetting is never completed .it stays in that processes/screens going on.Still to comlete after 24 hours.pls help how to make it up
Advance thanks
Ajay