[bootlin/training-materials] d48580: labs/sysdev-u-boot-stm32: add more details

[Thomas Petazzoni]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: d48580f12e8255bb5d9509c2312c9dd8167d8fb4
      https://github.com/bootlin/training-materials/commit/d48580f12e8255bb5d9509c2312c9dd8167d8fb4
  Author: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
  Date:   2022-09-22 (Thu, 22 Sep 2022)

  Changed paths:
    M labs/sysdev-u-boot-stm32/sysdev-u-boot-stm32.tex

  Log Message:
  -----------
  labs/sysdev-u-boot-stm32: add more details

(1) Explain that the FIP image needs to be re-generated/reflashed
after changing the U-Boot configuration

(2) Add a small section on playing around with the U-Boot environment.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>


  Commit: 73502b002f71f1fc10354531215cbd37c54c90e3
      https://github.com/bootlin/training-materials/commit/73502b002f71f1fc10354531215cbd37c54c90e3
  Author: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
  Date:   2022-09-22 (Thu, 22 Sep 2022)

  Changed paths:
    M common/kernel-clone-master-and-stable.tex

  Log Message:
  -----------
  common/kernel-clone-master-and-stable: reword

The text says that the repo from Torvalds would only contains a
"target that moves every day", which is completely incorrect. The repo
from Torvalds has tags, for each main kernel release. Those tags don't
move.

So the reason to use stable versions is not about "not using something
that moves every day".

Reword the whole section.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>


Compare: https://github.com/bootlin/training-materials/compare/b9233b520782...73502b002f71