meta-lxatac-bsp: barebox: increase boot timeout when serial booting #133
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When someone loads barebox via serial download instead of e.g. from the eMMC it is very likely that they want to upload an image via fastboot next and do not want to autoboot into linux right away.
Give them a bit more time to interrupt the boot process.
This PR is based on a discussion in PR #125 (comment).
There @a3f also brings up other points that concern the flashing guide in the README:
TODO before merging:
[ ] Inverstigate what @a3f said about the effect ofwd -x
and change the README accordingly.The investigation is a separate topic from the change introduced here.