[bootlin/training-materials updates] master: Boot time labs: work-around for Falcon Mode support (91948234)

[Thomas Petazzoni]

Repository : https://github.com/bootlin/training-materials
On branch  : master
Link       : https://github.com/bootlin/training-materials/commit/9194823469be3ed895823740937c65966601d5fe

>---------------------------------------------------------------

commit 9194823469be3ed895823740937c65966601d5fe
Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
Date:   Wed Apr 14 11:01:46 2021 +0200

    Boot time labs: work-around for Falcon Mode support
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>


>---------------------------------------------------------------

9194823469be3ed895823740937c65966601d5fe
 labs/boot-time-bootloader/boot-time-bootloader.tex | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/labs/boot-time-bootloader/boot-time-bootloader.tex b/labs/boot-time-bootloader/boot-time-bootloader.tex
index 901ceb60..a9abe80b 100644
--- a/labs/boot-time-bootloader/boot-time-bootloader.tex
+++ b/labs/boot-time-bootloader/boot-time-bootloader.tex
@@ -18,6 +18,11 @@ you've surely been longing to do.
 
 \section{Recompiling the bootloader}
 
+{\bf Importante note}: for this lab, because of issues with Falcon Mode
+in U-Boot 2019.01 that we are currently investigating, you will have to
+switch back to the 2019.01 version of U-Boot, configured with its
+\code{am335x_boneblack_defconfig} file.
+
 It's now time to eliminate useless features in U-Boot. Go to
 \code{~/boot-time-labs/bootloader/u-boot/} and run \code{make
 menuconfig} to unselect features that we don't need in our system.
@@ -38,9 +43,9 @@ time and fill the below table:
   Step & Duration & Description \\
   \hline
   \hline
-  U-Boot SPL & & Between \code{U-Boot SPL 2021.04} and \code{U-Boot 2021.04} \\
+  U-Boot SPL & & Between \code{U-Boot SPL 2019.01} and \code{U-Boot 2019.01} \\
   \hline
-  U-Boot & & Between \code{U-Boot 2021.04} and \code{Starting kernel} \\
+  U-Boot & & Between \code{U-Boot 2019.01} and \code{Starting kernel} \\
   \hline
   Kernel + Init scripts & & Between \code{Starting kernel} and \code{Starting ffmpeg} \\
   \hline
@@ -77,9 +82,9 @@ latest results:
   Step & Duration & Description \\
   \hline
   \hline
-  U-Boot SPL & & Between \code{U-Boot SPL 2021.04} and \code{U-Boot 2021.04} \\
+  U-Boot SPL & & Between \code{U-Boot SPL 2019.01} and \code{U-Boot 2019.01} \\
   \hline
-  U-Boot & & Between \code{U-Boot 2021.04} and \code{Starting kernel} \\
+  U-Boot & & Between \code{U-Boot 2019.01} and \code{Starting kernel} \\
   \hline
   Kernel + Init scripts & & Between \code{Starting kernel} and \code{Starting ffmpeg} \\
   \hline
@@ -198,7 +203,7 @@ When it works, update your table again:
   Step & Duration & Description \\
   \hline
   \hline
-  U-Boot SPL & & Between \code{U-Boot SPL 2021.04} and \code{Starting kernel} \\
+  U-Boot SPL & & Between \code{U-Boot SPL 2019.01} and \code{Starting kernel} \\
   \hline
   Kernel + Init scripts & & Between \code{Starting kernel} and \code{Starting ffmpeg} \\
   \hline