[bootlin/training-materials updates] master: slides/sysdev-bootloaders-u-boot: improve "Installing U-Boot" slide (04fc94ba)

Michael Opdenacker michael.opdenacker at bootlin.com
Wed Feb 1 15:36:53 CET 2023

Repository : https://github.com/bootlin/training-materials
On branch  : master
Link       : https://github.com/bootlin/training-materials/commit/04fc94bacecb2e2ea1c63b463cb416e8dc620a05


commit 04fc94bacecb2e2ea1c63b463cb416e8dc620a05
Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
Date:   Wed Feb 1 15:36:53 2023 +0100

    slides/sysdev-bootloaders-u-boot: improve "Installing U-Boot" slide
    Felt awkward not to clearly mention we're talking about
    internal storage. This slide comes from the old days when
    you could brick a board by breaking its bootloader, and
    couldn't recover by booting on external storage.
    We could even remove this slide.
    Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>


 .../sysdev-bootloaders-u-boot.tex                        | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/slides/sysdev-bootloaders-u-boot/sysdev-bootloaders-u-boot.tex b/slides/sysdev-bootloaders-u-boot/sysdev-bootloaders-u-boot.tex
index 73690d0e..f9acf7b7 100644
--- a/slides/sysdev-bootloaders-u-boot/sysdev-bootloaders-u-boot.tex
+++ b/slides/sysdev-bootloaders-u-boot/sysdev-bootloaders-u-boot.tex
@@ -219,22 +219,22 @@ $ make DEVICE_TREE=am335x-boneblack-wireless CROSS_COMPILE=arm-linux-
-\begin{frame}{Installing U-Boot}
+\begin{frame}{Installing U-Boot in flash (NAND or eMMC)}
   Different possibilities depending on the hardware:
   \item The ROM code provides some kind of specific boot monitor with
     which you can communicate through the serial port or USB using a
-    specific protocol
+    specific protocol, to flash U-Boot.
   \item The CPU boots first on removable media (SD card) before
-    booting from fixed media (NAND, eMMC). In this case, boot from
-    removable media to reflash a new version
+    booting from fixed media. In this case, boot from
+    removable media to reflash a new version.
   \item U-Boot is already installed, and can be used to flash a new
-    version of U-Boot. However, be careful: if the new version of
-    U-Boot doesn't work, the board is unusable
+    version of itself. If the new version of U-Boot doesn't work,
+    you will have to reflash it through another method (it is always
+    possible through an external SD card).
   \item The board provides a JTAG interface, which allows to write to
     the flash memory remotely, without any system running on the
-    board. It also allows to rescue a board if the bootloader doesn't
-    work.
+    board.

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