[FE training-materials-updates] Pin muxing lab: add details about the datasheet

[Michael Opdenacker]

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

On branch  : master
Link       : http://git.free-electrons.com/training-materials/commit/?id=156a4e3f85566627b7f87f4ad45c6b2fbb1955e7

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commit 156a4e3f85566627b7f87f4ad45c6b2fbb1955e7
Author: Michael Opdenacker <michael.opdenacker at free-electrons.com>
Date:   Wed Oct 8 09:29:01 2014 +0200

    Pin muxing lab: add details about the datasheet
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at free-electrons.com>


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156a4e3f85566627b7f87f4ad45c6b2fbb1955e7
 labs/kernel-i2c-communication/kernel-i2c-communication.tex | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/labs/kernel-i2c-communication/kernel-i2c-communication.tex b/labs/kernel-i2c-communication/kernel-i2c-communication.tex
index a9daadf..01303a1 100644
--- a/labs/kernel-i2c-communication/kernel-i2c-communication.tex
+++ b/labs/kernel-i2c-communication/kernel-i2c-communication.tex
@@ -38,7 +38,9 @@ packages: \code{ZCE} and \code{ZCZ}. If you have a very close look at the CPU
 on its lower right corner. The BeagleBonne Black Reference Manual also
 confirms this.
 
-So, in the {\em ZCZ Package Pin Maps (Top View)} section, you can find
+So, in the {\em ZCZ Package Pin Maps (Top View)} section\footnote{Caution: you
+won't be able to search the PDF file for this section name, for obscure
+reasons. At the time of this writing, this section is numbered 4.1.2.}, you can find
 hyperlinks to the descriptions of the \code{A16} and \code{B16} pins.
 That's where you can find reference pin muxing information for these
 pins.  You can find that the pin name for \code{A16} is \code{SPI0_CS0}