[U-Boot] "Embedding" default script with uboot image

["Zatkovský Dušan" <msk.conf@gmail.com>]

Hi all,

Excuse my question if it was solved somewhere in forum, but I didn't 
found an answer yet (maybe I can't find the right keywords).

I am building the uboot with yocto for imx6 board. I have started with 
some freescale defaults,
edited environment for my needs, saved environment etc ... Now I want to 
create a custom
"default" boot script, that will do some "heurestics", such as "look if 
usb stick is present, then boot from it, else boot from emmc, etc...".
Currently I am storing that script on first partition on emmc and 
loading it with ext2load.

But it has drawbacks:
- user should delete that file -> brick
- user should broke entire filesystem -> brick

I want this script to be "embedded" somehow with uboot image (which is 
placed outside partition table on device), but I didn't found any doc 
how to do that.
Currently I use CONFIG_EXTRA_ENV_SETTINGS for some basic stuffbut it is 
unmaintainable for bigger scripts.

Any suggestions?

Thank you.
--
Dusan