[FE training-materials-updates] U-boot lab: add details

[Michael Opdenacker]

Repository : git://git.free-electrons.com/training-materials.git

On branch  : master
Link       : http://git.free-electrons.com/training-materials/commit/?id=f6a140152e4b51bca1340ed4cec1bcada0ecfa0b

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commit f6a140152e4b51bca1340ed4cec1bcada0ecfa0b
Author: Michael Opdenacker <michael.opdenacker at free-electrons.com>
Date:   Tue Oct 8 09:40:35 2013 +0200

    U-boot lab: add details
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at free-electrons.com>


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f6a140152e4b51bca1340ed4cec1bcada0ecfa0b
 labs/sysdev-u-boot/sysdev-u-boot.tex |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/labs/sysdev-u-boot/sysdev-u-boot.tex b/labs/sysdev-u-boot/sysdev-u-boot.tex
index f42ccb6..f389d88 100644
--- a/labs/sysdev-u-boot/sysdev-u-boot.tex
+++ b/labs/sysdev-u-boot/sysdev-u-boot.tex
@@ -42,7 +42,10 @@ by your workstation.
 
 If your PC has an internal MMC/SD card reader, the device may also been
 seen as \code{/dev/mmcblk0}, and the first partition as
-\code{mmcblk0p1}. You will see that the MMC/SD card is seen in the same
+\code{mmcblk0p1}. \footnote{This is not always the case with internal
+MMC/SD card readers. On some PCs, such devices are behind an internal
+USB bus, and thus are visible in the same way external card readers
+are}. You will see that the MMC/SD card is seen in the same
 way by the IGEPv2 board.
 
 In the following instructions, we will assume that your MMC/SD card