All Hardware information in Ok Boot Prompt

Can anyone tell me the command to check all the hardware information in Ok boot Prompt. Like the hard disk space memory size .....

i don't know of such a command... but you'll find usefull informations with commands like banner and .properties (used in the dev tree of the OBP).

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You can use show-devs to display the complete device tree.
Total installed memory can be found from the banner command.
CPU and bus speeds can be found from the .speed command.

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There are a couple of things that you can do. A lot depends on your server model. Some of the older models don't have an extensive OBP.
probe-scsi-all
test-all
banner(as was suggested)

Set your diag-switch to true and boot the box.
setenv diag-switch? true
setenv diag-level max

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