[bootlin/training-materials updates] master: slides/sysdev-bootloaders-u-boot: add variables needed for Generic Distro boot (8a21c66f)

[Michael Opdenacker]

Repository : https://github.com/bootlin/training-materials
On branch  : master
Link       : https://github.com/bootlin/training-materials/commit/8a21c66f8f6f7271f440bf3fcf2a0c64a23ef401

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

commit 8a21c66f8f6f7271f440bf3fcf2a0c64a23ef401
Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
Date:   Tue Dec 6 10:49:11 2022 +0100

    slides/sysdev-bootloaders-u-boot: add variables needed for Generic Distro boot
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>


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

8a21c66f8f6f7271f440bf3fcf2a0c64a23ef401
 .../sysdev-bootloaders-u-boot.tex                    | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 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 6b093920..7e9a4a7f 100644
--- a/slides/sysdev-bootloaders-u-boot/sysdev-bootloaders-u-boot.tex
+++ b/slides/sysdev-bootloaders-u-boot/sysdev-bootloaders-u-boot.tex
@@ -849,7 +849,7 @@ Kernel image @ 0xc0100000 [ 0x000000 - 0x7306c8 ]
   \end{itemize}
 \end{frame}
 
-\begin{frame}{Generic Distro boot}
+\begin{frame}{Generic Distro boot (1)}
   \begin{itemize}
   \item Each board/platform used to have its own U-Boot environment,
     with custom variables/commands
@@ -873,7 +873,22 @@ Kernel image @ 0xc0100000 [ 0x000000 - 0x7306c8 ]
   \end{itemize}
 \end{frame}
 
-\begin{frame}[fragile]{Generic Distro boot example}
+\begin{frame}[fragile]{Generic Distro boot (2)}
+  \begin{columns}
+  \column{0.5\textwidth}
+  \small
+  Several environment variables need to be set:
+  \begin{itemize}
+     \item \code{kernel_addr_r}: address in RAM to load the kernel image
+     \item \code{ramdisk_addr_r}: address in RAM to load the initramfs image (if any)
+     \item \code{fdt_addr_r}: address in RAM to load the DTB (Flattened
+           Device Tree)
+     \item \code{pxefile_addr_r}: address in RAM to load the
+           configuration file (usually \code{extlinux.conf})
+     \item \code{bootfile}: the path to the configuration file,
+           for example \code{/boot/extlinux/extlinux.conf}
+  \end{itemize}
+  \column{0.5\textwidth}
   \begin{block}{Example {\tt /boot/extlinux/extlinux.conf}}
     {\tiny
 \begin{verbatim}
@@ -911,4 +926,5 @@ Starting kernel ...
 \end{verbatim}
     }
   \end{block}
+  \end{columns}
 \end{frame}