documentation update & added get-kernel-source script to facilitate b…

…uilding the modified usbtv driver.

README.md

@@ -40,7 +40,7 @@ Now connect the mini-USB power plug to the Raspberry Pi, then connect the extra
     Raspberry Pi          Header
     ---------------------------------
     P1/19 (MOSI)          LPD8806 DAT pin
-    P1/21 (SCLK)          LPD8806 CLK pin
+    P1/23 (SCLK)          LPD8806 CLK pin
     P1/5                  Push switch side A
     P1/6                  Push switch side B
 

misc/get-kernel-source.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+#
+# from https://gist.github.com/azbesthu/3893319
+
+REV=`zcat /usr/share/doc/raspberrypi-bootloader/changelog.Debian.gz | grep '* firmware as of' | head -n 1 | sed  -e 's/\  \*\ firmware as of \(.*\)$/\1/'`
+
+echo "Installing kernel source for revision $REV..."
+
+rm -rf rasp-tmp
+mkdir -p rasp-tmp
+mkdir -p rasp-tmp/linux
+
+wget https://raw.github.com/raspberrypi/firmware/$REV/extra/git_hash -O rasp-tmp/git_hash
+wget https://raw.github.com/raspberrypi/firmware/$REV/extra/Module.symvers -O rasp-tmp/Module.symvers
+
+SOURCEHASH=`cat rasp-tmp/git_hash` 
+
+wget https://github.com/raspberrypi/linux/tarball/$SOURCEHASH -O rasp-tmp/linux.tar.gz
+
+cd  rasp-tmp
+tar -xzf linux.tar.gz
+
+OSVERSION=`uname -r`
+
+mv raspberrypi-linux* /usr/src/linux-source-$OSVERSION
+ln -s /usr/src/linux-source-$OSVERSION /lib/modules/$OSVERSION/build
+
+cp Module.symvers /usr/src/linux-source-$OSVERSION/
+
+zcat /proc/config.gz > /usr/src/linux-source-$OSVERSION/.config
+
+cd /usr/src/linux-source-$OSVERSION/
+make oldconfig
+make prepare
+make scripts
+cd ~