BMC: Block BMC reboot during u-boot update

[anoo1]

Add a BlocksTransition dependency to the BMC reboot target during u-boot update so that BMC is prevented from being rebooted and corrupting u-boot.

[saqibkh]

• Create service files that can disable BMC transtition through reboot, shutdown, halt etc.
• Call Enable reboot halt services when ActivationBlockTransition object is created.
• Call Disable reboot halt services inside ActivationBlockTransition destructor.

Status:

July 12:
Discussed possible implementations with Andrew, Adriana and Patrick. Created service files and added the logic to ActivationBlocksTransition class inside phosphor-bmc-code-mgmt.

July 13:
Read up on systemd service files.
Explored alternate ways to accomplish this. None of those seems to work.

July 14:
The mapper call to check ActivationBlocksTransition is not working. Need to check with Adriana

July 17:
I'm at the point where a running service can block the reboot, but can't hold/delay the reboot command until after the code update.

July 19:
Not required for ESP. Focusing on other stories now.

[geissonator]

Needs more investigation

[rfrandse]

Abandoned
https://gerrit.openbmc-project.xyz/5266 BMC: Block BMC reboor during code update
Resolves #1944 BMC: Block BMC reboot during u-boot update

[rfrandse]

Abandoned
https://gerrit.openbmc-project.xyz/5266 BMC: Block BMC reboot during code update
Resolves #1944 BMC: Block BMC reboot during u-boot update

[rfrandse]

https://gerrit.openbmc-project.xyz/6613 BMC: Block BMC reboots during Code Update
Resolves #1944 BMC: Block BMC reboot during u-boot update

[geissonator]

Lets get yocto updated to 2.4, and see if the new systemd provides the function we need.

[rfrandse]

https://gerrit.openbmc-project.xyz/6613 BMC: Block BMC reboots during Code Update
Resolves #1944 BMC: Block BMC reboot during u-boot update