Added prog 5

src/5-MLO-LedBlink-RTCInterrupt-RelocatedIntVec/README.txt

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+3-MLO-LedBlink-RTCInterrupt
+===========================
+The next logical step to "2".
+Instead of using a delay loop we use the real time clock (RTC) on board BBB
+to generate a 1-second interrupt and write our own custom IRQ handler
+which just toggles the usr0 led.
+
+To build: 
+1) Make sure you have built the signgp utility first.
+2) Edit build.sh script to reflect your toolchain path
+2) ./build.sh mlo
+
+To run:
+This file has to be put onto an sd-card in raw format as described in the TI AM335x TRM - Sec 26.1.7.5.5
+1) Get hold of a u-sdcard and card reader.
+2) Delete all partitions on it and ensure there is only free space.
+3) Let BBB boot into its default OS and insert the usd.
+4) Copy the MLO to '/root' on BBB - 'scp MLO [email protected]:/root' (default password is blank)
+4) login to BBB - 'ssh [email protected]' (default password is blank)
+4) sudo dd if=/dev/zero of=/dev/sdX bs=512K count=1 --- clear out first 512k bytes of the disk with zeroes; [usually in BBB you can replace 'sdX' by 'mmcblk0']
+5) sudo dd if=/root/MLO of=/dev/sdX count=1 seek=1 conv=notrunc bs=128k --- write the MLO at an offset of 128k
+6) While holding the boot (S2) button remove power cable/USB cable and re-insert power while continuing to hold down S2.
+7) You should see the usr0 led toggle every second.
+

src/5-MLO-LedBlink-RTCInterrupt-RelocatedIntVec/README.txt~

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+1-MLO-usdBoot:
+==============
+
+This is a bare metal ARM assembly program to just turn on the USR0 blue led on the BBB.
+The actual binary generated will be prefixed with a TOC and GP header using the 'signgp' utility.
+This final binary is called MLO - Minimal loader.
+The actual purpose of an MLO is to chain load the second stage bootloader which will futher boot the kernel.
+But here we're just trying to boot the BBB using our MLO from the external u-sdcard.
+The MLO here just acts as a container for bare metal assembly code.
+
+To build: 
+1) Make sure you have built the signgp utility first.
+2) Edit build.sh script to reflect your toolchain path
+2) ./build.sh mlo
+
+To run:
+This file has to be put onto an sd-card in raw format as described in the TI AM335x TRM - Sec 26.1.7.5.5
+1) Get hold of a u-sdcard and card reader.
+2) Delete all partitions on it and ensure there is only free space.
+3) sudo dd if=/dev/zero of=/dev/sdX bs=512K count=1 --- clear out first 512k bytes of the disk with zeroes
+4) sudo dd if=MLO of=/dev/sdX count=1 seek=1 conv=notrunc bs=128k --- write the MLO at an offset of 128k
+5) Let BBB boot into its default OS and insert the usd.
+6) While holding the boot (S2) button remove power cable/USB cable and re-insert power while continuing to hold down S2.
+7) You should see the USR0 led glow

src/5-MLO-LedBlink-RTCInterrupt-RelocatedIntVec/build-alt.sh~

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+#!/bin/bash  
+export TOOLCHAIN_PATH="/usr/arm-linux-gnueabi/bin"
+
+${TOOLCHAIN_PATH}/as $1.s -o $1.o
+${TOOLCHAIN_PATH}/objcopy $1.o $1.bin -O binary
+${TOOLCHAIN_PATH}/objdump -SD $1.o
+
+../../bin/signgp ./$1.bin
+mv $1.bin.ift MLO

src/5-MLO-LedBlink-RTCInterrupt-RelocatedIntVec/build.sh

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+#!/bin/bash  
+export PATH=$PATH:"/home/mutex/Projects/dhARMa/toolchain/gcc-arm-none-eabi-4_9-2015q1/bin" 
+
+arm-none-eabi-as $1.s -o $1.o
+arm-none-eabi-objcopy $1.o $1.bin -O binary
+arm-none-eabi-objdump -SD $1.o > $1.dmp
+
+../../bin/signgp ./$1.bin
+mv $1.bin.ift MLO