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WOrking with unknown Sun Computers

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  WOrking with unknown Sun Computers by Bill Degnan - 09/15/2026 12:05
probing a sun system

things you can do from the ok prompt:

1. set your external scsi boot device to address 6
2. from the ok prompt: (if hard drive, and fallback to default "disk"):
setenv boot-device disk6 disk

(if CD rom or similar and then try disk6)
ok setenv boot-device cdrom disk6

(sometimes you have to enter it this way)
ok setenv boot-device disk@6,0 disk

3. view changes
ok printenv boot-device

4. apply and reboot (one or the other depending on rev of openBoot
ok reset-all
ok reset

Three things can happen

1. drive is not available or error

2. System boot up into SunOS of some sort (expect errors if the external device is from a different computer than the computer being used to probe the drive

3. The error message "The file just loaded does not appear to be executable" means OpenBoot successfully communicated with the external storage drive, found a partition structure, and read a file into memory. However, because OpenBoot expected a bootable kernel file (like vmunix or inetboot) containing specific Sun SPARC executable headers (ELF or a.out formats), it stopped and threw this error when it found incompatible data instead.Since this is a dedicated storage drive and not boot media, this behavior is completely expected:

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