support custom u-boot config

Bug Description

An upcoming platform (keystone2) has a need to be able to set a u-boot environment variable, but the appropriate setting needs to be controlled by software running in Ubuntu (pre-boot memory configuration changes). Right now bootscripts provided by flash-kernel are immutable - the end user can't go in and add settings without creating a custom flash-kernel package. We should provide packages and users with an interface to add custom settings to platform bootscripts.

[Impact]
Users of the keystone2 platform will have no supported way to configure u-boot settings necessary to make use of features of their hardware.
[Test Case]
echo "setenv foo bar" > /etc/flash-kernel/ubootenv.d/foo
sudo flash-kernel
Confirm that /boot/boot.scr includes the "setenv foo bar" command
[Regression Risk]
The proposed change requires explicit opt-in support for a given platform, and currently we're only adding it to not-yet-released platforms.

Hello dann, or anyone else affected,

Accepted flash-kernel into trusty-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/flash-kernel/3.0~rc.4ubuntu49.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

This bug was fixed in the package flash-kernel - 3.0~rc.4ubuntu49.1

---------------
flash-kernel (3.0~rc.4ubuntu49.1) trusty; urgency=medium

* Add U-Boot environment configuration support (LP: #1328597)
* Explicitly lower the console speed for HP ProLiant m400 cartridges to 9600
and enable hardware flow control as required by the HP moonshot chassis
(LP: #1328280)
* Enable U-Boot environment support for X-Gene platforms
* Use filesystem agnostic "load" command instead of assuming ext4
* Add support for HP ProLiant m800 cartridges (LP: #1326437)
-- dann frazier <email address hidden> 2014年6月20日 17:09:02 -0600