Archive for April, 2008
Monday, April 28th, 2008 by Marcin Juszkiewicz
Today was another night when I had to wake up to monitor my daughter and turn her to the back after about half hour. All due to night feeding.
Most of times I use this time to hack on my work projects and chat on IRC — mostly on #maemo as this channel never sleeps (gratz to KotCzarny and AStorm).
But back to the subject. Children and their funny moves… After I turned Mira to the back she squirms in a funny ways — all those hips shaking, hands waving before she will find optimal position so I can cover her with blanket.
She is sweet :)
Tags: children irc maemo 1 Comment »
Thursday, April 17th, 2008 by Marcin Juszkiewicz
My main system gives me this:
hrw@home:~$ history|awk '{a[$2]++ } END{for(i in a){print a[i] ” ” i}}’|sort -rn|head
379 git
209 bitbake
171 cd
113 sudo
111 ls
77 rm
76 mc
73 mtn
73 grep
72 svn
It is easy to see what takes most of my time ;)
Tags: linux 1 Comment »
Friday, April 11th, 2008 by Marcin Juszkiewicz
Few days ago Nokia N800 tablet emulation was released into public. Richard integrated it into Poky so now we have QEMU which can be used not only to test ARM images on ARM Versatile or Sharp Zaurus but also to run on Nokia N800 tablet. Of course it is not limited to Poky images — Maemo boots very nicely on it :)
Poky
Booting Poky is easy: runqemu nokia800 after building of “poky-image-sato” for “nokia800″ machine. After few minutes (needed to create NAND Flash image and boot into JFFS2 rootfs) Poky desktop appears:
Maemo
Booting Maemo takes few steps more now (will be improved).
- Edit “scripts/poky-qemu-internal” script and in line 154 change KERNELCMDLINE to boot from “/dev/mtdblock3″ instead of “/dev/mtdblock4″ as Poky do not use Maemo’s “initfs”.
- Get copy of “config” flash partition from N8×0 — simple “cat /dev/mtd1ro > config.mtd” is enough. Bad news: it does not work :( And the one which works for me is not distributable as it does not came from device but was pre-generated somehow.
- Transfer it to the desktop.
- Grab OS2008 firmware image from Maemo website.
- Unpack firmware image to get kernel and images of “initfs” and “rootfs”.
- Use
poky-nokia800-flashutil to generate NAND Flash image:
poky-nokia800-flashutil initfs.jffs2 maemo-image.qemuflash initfs
poky-nokia800-flashutil config.mtd maemo-image.qemuflash config
poky-nokia800-flashutil rootfs.jffs2 maemo-image.qemuflash rootfs
Then “touch maemo-image” and run one command: poky-qemu zImage maemo-image to boot it.
Status
Basic emulation works. There is no networking yet, DSP code is not emulated and few other limitations. But it is work in progress so expect improvements.
How to get it
Patch alone can be fetched from Poky repository.
Linux binaries of QEMU with N800 support can be built with Poky by bitbake qemu-sdk command. They will be also part of Poky Linux SDK — nightly builds are available on Poky website.
UPDATE: poky-nokia800-flashutil instructions are fixed (thx to Yasser)
Tags: maemo nokia poky qemu 18 Comments »
Thursday, April 10th, 2008 by Marcin Juszkiewicz
Three months ago I wrote post about situation of my Nokia 770 tablet. Today I looked how situation looks with non-Maemo systems.
Flashed recent Poky Linux build. Device booted into nice Sato desktop which I am familiar with. As it was expected — no WiFi support in base system. Why? Licensing problem.
Nokia tablets WiFi stack in implemented by:
- firmware loaded to the chip at runtime (when interface is brought up)
- closed source wi-fi stack in module umac.ko
- open source glue layer cx3110x which forwards packets between firmware and umac.ko over SPI and implements support for linux wireless extensions API.
We also use 2.6.18 kernel from OS2007 instead of 2.6.16.27 from OS2006. With some hacking on “umac.ko” module from 2.6.16.27 + patching “cx3110x” driver I got module which loads on my device. But then other problem appeared — WPA Supplicant is unable to connect to WiFi interface due to lack of wireless extensions support. And Nokia implementation is closed source :(
On IRC I got information that there is a patch which adds WE18 support into cx3110x driver. Fetched, applied but situation is the same:
[ 7206.999359] umac: module license 'Proprietary' taints kernel.
[ 7210.030334] CX3110x chip variant: STLC4370
[ 7210.319458] CX3110x: firmware version: 2.13.0.0.a.13.14
[ 7210.319580] Loaded CX3110x driver, version 0.8
root@nokia770:~# wpa_supplicant -Dwext -iwlan0 -c /etc/wpa_supplicant.conf
ioctl[SIOCSIWPMKSA]: No such device
and then reboot :(
So it looks like my 770 will get Maemo OS2006 again and will end it’s life as console for simple games + music player. Too bad that it hard to make it work with other systems.
BTW: I wonder why Maemo.org forbids GoogleBot… It is really hard to find Maemo related things with Google :(
UPDATE: Niels Breet (X-Fade on #maemo) pointed me to maemo webdevs discussion which clarify that GoogleBot index Maemo websites. My fault — sorry guys. It is hard to find current informations in wiki but there are plans to move to MediaWiki and reorganize content.
Tags: nokia poky 10 Comments »
Wednesday, April 9th, 2008 by Marcin Juszkiewicz
This year I decided to strip my blog from CSS code used for making design (as part of CSS Naked day).
The idea behind this event is to promote Web Standards. Plain and simple. This includes proper use of (x)html, semantic markup, a good hierarchy structure, and of course, a good ‘ol play on words. It’s time to show off your <body>.
And I think that my blog do that quite well. OK, it has few bugs in code so no W3C validation but it is partially WordPress fault ;D
Tags: css website No Comments »
Monday, April 7th, 2008 by Marcin Juszkiewicz
OpenEmbedded builds usually take lot of time as not everyone has build machines with multiple CPUs (or multi-core CPUs). But how to make them faster and make better use of multiple CPU cores?
Solution is in two BitBake variables:
- PARALLEL_MAKE — this is passed to
make so setting it to “-j X” is handy (where value of X depends on number of CPU cores)
- BB_NUMBER_THREADS — amount of BitBake threads used to run tasks such as do_fetch, do_configure, do_compile etc. Do not set too big value or machine will melt and you will loose control over it ;)
Which values are sane? On Core2Quad I use “-j 4″ and 16 BitBake threads. On dual core Athlon64 I use less threads (only 4) but this machine is also my desktop so I like to be able to work :) Sometimes I have two builds locally running with those settings and it is still usable.
How to check which one are good for you? Run htop on one console and builds on another. If CPU cores are busy and it does not hit swap too often then it is OK.
Tags: openembedded poky No Comments »
