Out-of-band method
For information about using the IMM web interface to recover the UEFI firmware,
see the IMM documentation.
Nx boot failure
This topic provides information about Nx boot failure.
Configuration changes, such as added devices or adapter firmware updates, and
firmware or application code problems can cause the server to fail POST (the
power-on self test). If this occurs, the server responds in either of the following
ways:
v The server restarts automatically and attempts POST again.
v The server hangs, and you must manually restart the server for the server to
attempt POST again.
After a specified number of consecutive attempts (auto or manual), the Nx boot
failure feature causes the server to revert to the default UEFI configuration and
start the Setup utility so that you can make the necessary corrections to the
configuration and restart thr server. If the server is unable to successfully complete
POST with the default configuration, there might be a problem with the system
board.
To specify the number of consecutive restart attempts that will trigger the Nx boot
feature, in the Setup utility, click Settings > POST Attempt Limit . The available
options are 3, 6, 9, and 255 (disable Nx boot failure).
Confirm and recover IMM boot image failure
This topic provides instructions for how to confirm and recover IMM boot image
failure.
Check the system management heartbeat LED to confirm whether the uBoot fails
to boot. Normally, system management heartbeat LED on the planar will start
blinking rapidly when the ac cord is plugged to the system. It will then turn to
slow blink after some time (usually within 5 minutes). This indicates IMM system
has started up and firmware application is starting to load. It will usually grant
power permission to the server system within 1 minute after the heart beat LED
slows down. Be careful here, this system management heartbeat LED is not the
power button. It’s a LED locates on the system board which you may need to
remove the cover to check. The location of x3850X5 system management heartbeat
LED is CR33 (Refer to the "Microprocessor board non-light-path-diagnostics status
LEDs" table, see “Microprocessor-board LEDs” on page 24).
If the system management heartbeat LED doesn't blink, it confirms that Uboot fails
to boot. In this case, try the following method to recover Uboot.
1. Power off the system, unplug the power cord.
2. Remove the cover and close the Backup Uboot jumper J75-A5.
3. Plug the power cord and start to boot the IMM from backup uBoot code.
4. If IMM is back running normally and accessible, update latest IMM firmware
through in-band or out-of-band method.
5. Power off the server, disconnect the power cord from the server. Remove the
cover and open the hardware jumper.
Chapter 3. Diagnostics 75
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