[bootlin/training-materials updates] master: Boot time: grabserial can trace the ROM code too (8515e9d5)

[Michael Opdenacker]

Repository : https://github.com/bootlin/training-materials
On branch  : master
Link       : https://github.com/bootlin/training-materials/commit/8515e9d516d6b0db83c09f3196e43b62f45fbe9c

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

commit 8515e9d516d6b0db83c09f3196e43b62f45fbe9c
Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
Date:   Tue May 17 09:59:47 2022 +0200

    Boot time: grabserial can trace the ROM code too
    
    If it's not silent
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>


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

8515e9d516d6b0db83c09f3196e43b62f45fbe9c
 slides/boot-time-measuring/boot-time-measuring.tex | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/slides/boot-time-measuring/boot-time-measuring.tex b/slides/boot-time-measuring/boot-time-measuring.tex
index 989c42b9..af467da7 100644
--- a/slides/boot-time-measuring/boot-time-measuring.tex
+++ b/slides/boot-time-measuring/boot-time-measuring.tex
@@ -69,7 +69,7 @@
       go through more complex software stacks (loss of time accuracy).
 \item Limitation: won't be able to time the "Power on" event in
       an accurate way. But acceptable as you can assume that
-      the time to run the first stage bootloader is constant.
+      the time to run the ROM code is constant.
 \end{itemize}
 \column{0.25\textwidth}
 % From https://openclipart.org/detail/173570/serial-db9-female-by-deusinvictus-173570
@@ -86,7 +86,8 @@
 \begin{itemize}
 \item A Python script to add timestamps to messages received on a
       serial console.
-\item Key advantage: starts counting very early (bootstrap and bootloader)
+\item Key advantage: starts counting very early (ROM code --- if not
+      silent, bootstrap and bootloader)
 \item Another advantage: no overhead on the target, because run on the host machine.
 \item Drawbacks: may not be precise enough. Can't measure power up time.
 \item Ubuntu package: \code{grabserial}\\