[Buildroot] [PATCH 1/2] uboot: add support for generating U-Boot boot scripts
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Thu Jun 22 11:31:20 UTC 2017
Hello,
On Thu, 22 Jun 2017 13:06:02 +0200, Peter Korsgaard wrote:
> > More and more of our defconfigs need to generate a U-Boot boot
> > script. It's a simple call to mkimage, but we already have 12
> > instances of this logic in board/, and there are patch series waiting
> > in patchwork adding 3 more boards that need this.
>
> > So let's add an option in the U-Boot package to generate such a boot
> > script image easily.
>
> > Note that we assume a single script needs to be generated, and the
> > output file name is boot.scr. The only platform for which it seems to
> > not be the case are the Boundary Devices platforms: they generate two
> > boot scripts, 6x_bootscript and 6x_upgrade, but they are anyway
> > installed inside TARGET_DIR, not BINARIES_DIR.
>
> > Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
>
> Makes sense to me. Committed, thanks.
Wow, that was fast. I was wondering if we should extend it to multiple
boot scripts, but then the syntax would be a bit horrible:
BR2_TARGET_UBOOT_BOOT_SCRIPT_SOURCE="script1src:script1dest script2src:script2dest"
We could still keep the compatibility by having:
BR2_TARGET_UBOOT_BOOT_SCRIPT_SOURCE="script1src"
just generate script1src and install it as boot.scr.
Or maybe it's something we can take care of later?
> > Retrospectively, I believe the choice of adding such a helper script
> > for genimage was wrong. Having a proper option would be much
> > cleaner/nicer IMO.
>
> Yes, agreed. My idea was also to add a kconfig option for it. This could
> also have sub options like "support creating fat partitions" that would
> pull in the needed host packages.
Also my thinking.
> The reason we went with the script solution was afaik that some projects
> might want to extra processing before or after creating the image, so it
> wasn't clear if it should run before or after the post-image scripts.
>
> You can argue though that for such "special" situations you should just
> manually call genimage from the post-image script instead though.
Absolutely. I don't think we should try in those options to cover *all*
cases, only the most common ones. As long as the more special cases can
be covered by custom logic in post-build/post-image scripts, we're good
IMO.
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
More information about the buildroot
mailing list