On Wed, 2014-05-21 at 14:59 -0600, dann frazier wrote: > hey, > A couple of projects we're working on at work require some > tweaking of u-boot settings. These requirements can be summed up by: > > A) Maintain the console= setting, and ideally all userargs (the > cmdline args after "--") after install. This seems like standard > Debian functionality that exists on other architectures, but is > currently missing on flash-kernel platforms. > > B) The ability to let a package change settings in the u-boot > environment. We have a case where a u-boot envvar setting > needs to differ depending on whether or not certain software > will be used (their u-boot has special code that reconfigures > the hardware depending on the setting of this variable). > > The systems we're dealing with use a boot.scr script generated by > flash-kernel. So, we figure we could solve both by letting packages > drop in u-boot code snippets that will be prepended to the > boot.scr. To do this, we propose a scheme similar to initramfs-tools > where packages can drop snippets in a path under /usr/share (solving > B), and users can add their own new setings or override the /usr/share > versions by dropping snippets under /etc. With this scheme in place, > flash-kernel-installer could be extended to drop in a file in /etc > that does a 'setenv bootargs $userargs' to solve (A). Comments?
I think snippets like this are a useful idea in general, but I wonder if something like the command line isn't deserving of "higher billing", e.g. via a setting in /etc/defaults/flash-kernel:COMMAND_LINE? FWIW latest Debian flash-kernel supports substituting @@KERNEL_VERSION@@ in the boot.scr with the actual kernel version in use. We could follow a similar path for command line args (e.g. if you agree /e/d/flash-kernel is a good place for this setting). > +user_params="$(echo $(user-params))" What does this contain in practice? Just the post "--" stuff given to the installer or also the generated root= stuff etc? How does this interact with the Bootloader-Sets-Incorrect-Root setting? Should it consume the same settings somehow (assuming root= is involved here at all)? Ian. -- To UNSUBSCRIBE, email to debian-boot-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/1401101671.24177.14.ca...@dagon.hellion.org.uk
