make EXTRAVERSION=-omap1 rx51_defconfig

# Enable the framebuffer console to display kernel messages
 CONFIG_FRAMEBUFFER_CONSOLE=y

make EXTRAVERSION=-omap1 oldconfig

make EXTRAVERSION=-omap1 bzImage

flasher-3.5 -f -k /scratchbox/users/sysop/home/sysop/maemo_kernel/kernel-2.6.28/arch/arm/boot/zImage

File: /etc/apt/sources.list.d/hildon-application-manager.list

deb https://downloads.maemo.nokia.com/fremantle/ssu/apps/ ./
deb https://downloads.maemo.nokia.com/fremantle/ssu/mr0 ./
deb https://downloads.maemo.nokia.com/fremantle/ovi/ ./
deb http://repository.maemo.org/extras fremantle free non-free
deb http://repository.maemo.org/extras-devel fremantle free non-free
deb http://repository.maemo.org/extras-testing fremantle free non-free

rootsh
mad-developer

N900 Installing and using Bootchart

Actually we need 3 files: bootchartd bootchartd.conf and usleep. These files get modified and installed on the N900. But read on…

Login to scratchbox and select target:

scratchbox
sb-conf select FREMANTLE_ARMEL

wget http://prdownloads.sourceforge.net/bootchart/bootchart-0.9.tar.bz2
tar xvfj bootchar-0.9.tar.bz2

Create a directory for our files

mkdir BOOTCHART
cd BOOTCHART

And copy the relevant bootchart files to it

cp ../bootchart-0.9/scripts/bootchartd ./
cp ../bootchart-0.9/scripts/bootchartd.conf ./

To get bootchart running on the N900 some modifications are necessary:

bootchart uses the gnu sleep which accepts sleep times less than a second like: sleep 0.2. Maemo on the other hand uses busybox’s sleep function which only accept integers like: sleep 5. Because of this we have to develop a small binary to fulfill the requirement of sleeping less than a second.

Develop usleep by creating a file with the following content:

#include <stdio.h>
#include <stdlib.h>

int main (int argc, char **argv) {
	if (argc != 2) {
		printf("Usage: usleep [usec]\n");
		return 1;
	}
	else {
		usleep(atoi(argv[1]));
		return 0;
	}
}

and compile the file with:

gcc -o usleep usleep.c

and copy it also to our directory BOOTCHART

Now replace every occurrence of

sleep $SAMPLE_PERIOD

with

usleep $SAMPLE_PERIOD

NOTE: don’t touch the strings with “sleep 5” for example, since our usleep would only sleep for 5 usec insted of 5s!

Since the bootchart script isn’t run within bash we have to deal with another incompatibility from busybox. Within the script you will find (line 104) something like this:

uptime=${uptime/./}

In bash this would remove all dots (.) within the variable $uptime. Not so in busybox where you will get a error message: -sh: syntax error: Bad substitution

We will replace that line with:

uptime=${uptime%%.*}${uptime##*.}

This line just concatenate everything before and everything after the dot (.). Same effect, different approach.

Since there’s only 8 configuration variables within the bootchart.conf I included them directly within the script.

Note: Be sure that you replace the SAMPLE_PERIOD variable because of our usleep command.

SAMPLE_PERIOD=200000

Since the bootchart logs it’s data to a tmpfs which isn’t actually existing (accessible) once the N900 is up again, we have to define a process which will trigger bootchart to stop logging and start packaging and saving it’s results to $BOOTLOG_DEST (/var/log/bootchart.tgz by default). I’ve used the process “browser” to trigger this. So when I reboot the N900 the logging stops immediately if i start the default webrowser.

...
local exit_proc="gdmgreeter gdm-binary kdm_greet kdm browser"
...
exit_proc="mingetty agetty rungetty getty browser"
...

Since there might be a /tmp directory (which would be preferred by bootchart) force the script to create the tmpfs by uncomment the if-clause at around line 43:

# if [ -z "$LOG_DIR" ]; then
    LOG_DIR="/mnt"
    LAZY_UMOUNT="yes"
    mount -n -t tmpfs -o size=$TMPFS_SIZE none "$LOG_DIR" >/dev/null 2>&1
# fi

Now we have 2 files within our BOOTCHART directory:

* bootchartd
* usleep

Copy both files to /sbin on your N900 with ssh or whatever.

The last thing we have to do is to tell the kernel to use /sbin/bootchart as initscript and tell bootchart that it should start /sbin/preinit. Normally this would be archived with the kernel option:

init=/sbin/bootchart bootchart_init=/sbin/preinit

To archieve this you can:

• build custom kernel with the appropriate CONFIG_CMDLINE
• WARNING UNTESTED (might mess up NOLO-bootloader) use the flasher-3.5 with the commandline option –boot[=ARG]

INSTALL ALL REPOS: N900 click here

http://my-maemo.com/download/repos/extras.install

Catalog name: maemo.org extras
Web address: http://repository.maemo.org/extras
Distribution: fremantle
Components: free non-free

Catalog name: Maemo 5 SDK tools
Web address: http://repository.maemo.org/
Distribution: fremantle/tools
Components: free non-free

http://my-maemo.com/download/repos/extras-testing.install

Catalog name: maemo.org extras-testing
Web address: http://repository.maemo.org/extras-testing
Distribution: fremantle
Components: free non-free

http://repository.maemo.org/extras/install/extras-devel-fremantle.install

http://my-maemo.com/download/repos/extras-devel.install

[catalogues]
catalogues = extras-devel

[extras-devel]
name = Extras-Devel
uri = http://repository.maemo.org/extras-devel/
components = free non-free