On 11/18/2018 2:01 AM, Sad Clouds wrote:
On Sat, 17 Nov 2018 18:53:51 -0700 Don NetBSD <netbsd-embedded%gmx.com@localhost> wrote:The earlier "u-boot" prompt is significant as it lets you tinker with the "pre-Linux" environment. Among other things, it lets you erase the Linux password so you CAN log into the SP (if you'd lost that information) I want to know what else it is useful for (besides exploring "help" at that prompt)U-Boot is just a bootloader, like Grub, the only useful thing it does, is booting embedded Linux. Not sure why you'd want to tinker with that, because if you misconfigure/damage it, you may find your hardware no longer boots.
Actually, it does a fair bit more than "just boot Linux" -- hence the
reason to tinker with it! :> (why would it have a command interpreter if
the only thing it could do was "boot"?)
[Hint: ask yourself what you'd do if you didn't have the password to the ILOM;
or, if the Linux image had been corrupted/wouldn't boot; or if you wanted to
reflash that image (e.g., to support 11.4); or, if the serial port wasn't
"connected" to the ILOM]
For folks like me who acquire these devices without being able to
speak to the previous owner ("what's root's password?"), it's an
essential tool to getting into a box that may typically have been
locked up to prevent casual access (esp as you can't "pull the SP's
disk" to alter its contents off-line)
The hooks have been placed there, for a reason. Silly NOT to understand
them and use them!
But anyway, good luck with your investigations