[bootlin/training-materials updates] master: Embedded Linux labs: add link related to nand write.trimffs (49eaa031)

[Michael Opdenacker]

Repository : https://github.com/bootlin/training-materials
On branch  : master
Link       : https://github.com/bootlin/training-materials/commit/49eaa031d891f455ab97484b7703dbd3d5f6f7e7

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

commit 49eaa031d891f455ab97484b7703dbd3d5f6f7e7
Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
Date:   Tue May 18 11:39:37 2021 +0200

    Embedded Linux labs: add link related to nand write.trimffs
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>


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

49eaa031d891f455ab97484b7703dbd3d5f6f7e7
 labs/sysdev-flash-filesystems/sysdev-flash-filesystems.tex | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/labs/sysdev-flash-filesystems/sysdev-flash-filesystems.tex b/labs/sysdev-flash-filesystems/sysdev-flash-filesystems.tex
index 659c3af7..ed641804 100644
--- a/labs/sysdev-flash-filesystems/sysdev-flash-filesystems.tex
+++ b/labs/sysdev-flash-filesystems/sysdev-flash-filesystems.tex
@@ -188,7 +188,9 @@ command \code{nand write}\footnote{The command \code{nand write.trimffs} skips
   only checks the page, and if it is blank it doesn't erase it, but as
   the OOB is not blank it leads to ECC errors. More generally it is
   not recommended writing more than one time on a page and its OOB
-  even if the page is blank.}.
+  even if the page is blank. See also
+  \url{http://www.linux-mtd.infradead.org/doc/ubi.html\#L_flasher_algo} for
+  further details}.
 
 With the \code{ubi part UBI} command, make sure that U-Boot could process
 the UBI image that you've just flashed.