Power Log Collector

This Power Log Collector boots an XO-1 or XO-1.5 and copies the power logs to itself before shutting the laptop down.

Note: will not work on secured laptops without signing.

Does not work for XO-1.75 yet.

How to Use

• Download Power-log-collector.tar.bz2 and unpack onto a USB flash drive,
• Shut down the XO,
• Insert the USB drive, and
• Turn on the XO.

The XO will collect the power logs, print a message saying has done so and then shut down.

Theory of Operation

• Based on Tiny Core Linux,
• An Open Firmware Boot Script selects the XO-1 or XO-1.5 kernel,
• The initial ramdisk mounts /dev/sda (which should be the first USB drive), and
• executes rc.local on that drive, which does the collection.

How it was Made

It was made by remastering Tiny Core Linux.

Unpack the initial ramdisk to the current directory:

# gunzip <../initrd.gz | cpio -i

Modify the files as needed, then repack the initial ramdisk:

# find | sudo cpio -o -H newc --quiet | gzip -2 > ../initrd.gz

Then assemble into a .tar.bz2 for download.

rc.local

The script that does the collection:

#!/bin/sh

uname -a | grep _xo1-
if [ $? -eq 0 ]
then
       echo detected xo-1.0
       XO_ROOT=mtdblock0
       XO_FS=jffs2
else
       echo detected xo-1.5
       XO_ROOT=mmcblk0p2
       XO_FS=ext3
fi

mkdir -p /mnt/$XO_ROOT

mount -t $XO_FS -o ro /dev/$XO_ROOT /mnt/$XO_ROOT
mkdir -p /mnt/sda1/power-logs
cp /mnt/$XO_ROOT/home/olpc/power-logs/* /mnt/sda1/power-logs
umount /mnt/$XO_ROOT
mount /dev/sda1 /mnt/sda1 -o remount,ro
sync
echo Power Logs Recovered
echo Shutting down in 10 seconds
echo You may remove the USB now
sleep 10
poweroff

OpenFirmware Alternative

Place this as boot/olpc.fth on an ext2 USB drive:

\ OLPC Power Log Collection Script

visible
dir int:2,\home\olpc\power-logs\pwr*
copy int:2,\home\olpc\power-logs\pwr* u:\
." Power Logs Recovered" cr
." Shutting down in 10 seconds" cr
." You may remove the USB drive now or later" cr
d# 10000 ms
power-off