embedded-linux: labs: add mention about u-boot build failure and fix

u-boot build can fail on hosts with recent python environment. The issue is due to an API break, and it has already been identified and fixed upstream (see [1]). Add a small mention about this in case trainees encounter the issue as well. This commit should be removed once we upgrade u-boot on version >= v2025.04 Signed-off-by: Alexis Lothoré <[email protected]>
bootlin · Jan 15, 2025 · 309e988 · 309e988
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commit 309e988
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diff --git a/labs/sysdev-u-boot-stm32/sysdev-u-boot-stm32.tex b/labs/sysdev-u-boot-stm32/sysdev-u-boot-stm32.tex
@@ -166,6 +166,14 @@ \section{U-Boot setup}
   specify our board's device tree name on
   \code{Device Tree Control} $\rightarrow$ \code{Default Device Tree for DT Control}
   option.
+
+{\bf Note}: u-boot build may fail on your machine if you have a recent
+version of python. Such issue is
+\href{https://source.denx.de/u-boot/u-boot/-/commit/a63456b9191fae2fe49f4b121e025792022e3950}{already
+fixed upstream}, but not in the version targeted for the training. To get the relevant fix,
+you can cherry-pick the fix onto your local branch:
+
+\code{git cherry-pick a63456b9191fae2fe49f4b121e025792022e3950}
 \end{enumerate}
 
 \section{TF-A setup}