Current statusThe 2.6.31-rc3 kernel is booting. Long live the serial cable, which revealed that there currently is a problem with the alsa sound device driver. So after disabling sound support in the kernel for the time being the kernel at least boots. Not that I see anything in the console! Bummer, the lcd (or backlight?) seems to be turned off. But from the serial console I understand that everything boots ok. After logging in as "root" (blindly) and starting "xinit" the Zubuntu desktop is started. Fonts are displayed as boxes, but hey, that should be easily fixed. I almost got excited, but soon found out that the touchscreen doesn't seem to work. But then again, I didn't calibrate the screen... Now, how do I press Ctrl-Alt-Backspace on this ridiculous small keyboard... I don't know, stuck again I guess. Ouch, have to Reset the device again, possibly corrupting the filesystem.
Anyone willing to help from here?
Bare in mind that this is all pretty experimental, so if you want to try it yourself don't be afraid to get your hands dirty and be prepared for some nasty headaches!
Backing up your deviceFirst thing I did was making a NAND backup. If, in the worst case, this doesn't work out, I can always restore to the original state. Let me document here how I did that, because I didn't know that myself for this device. First of all make sure you have a FAT formatted SD or CF card inserted for storing the backup.
Removing AC/Power, keep the 'D' and 'P' keys pressed on the keyboard and then press the Reset button on the back of the device. The Diagnostic menu should show up now. While in the menu plug in the AC/Power adapter, just to make sure there's enough juice for backing up the device. Go Left and Down twice and press "Ok" to select the option "NAND BACKUP". Follow further instructions on screen. Good thing this device has English messages by the way! All the other models I own show Japanese messages, and well, although I know my way around those menus, I really don't understand any of the text shown. Anyway, after the backup has finished press Cancel to get back to the Diagnostic menu.
Press the Reset button again to turn off the device. I don't know if this is the preferred way to do this, but I couldn't find a better method.
Making preparationsUse the instructions for setting up the Zubuntu filesystem from here in the "Making preparations" part. The Tosa specific root-additions can be found here.
Flashing the Multiboot kernelSince I messed up my build tree pretty badly I wasn't able to build a multiboot kernel for the Tosa. Luckily 'Ant' had a copy lying around somewhere (thanks for that Andrea) so off I went flashing the multiboot kernel.
First, plug in the AC/Power adapter. Second, insert your FAT formatted CF or SD card containing the updater.sh and zImage.bin files. Now Reset the Zaurus using the button on the back of the device. To get into the Maintenance menu, press and hold the "OK" button, and press the power button. It should pop up a menu that has four options (nicely in English again), choose the option that says "Update". Select the medium that you are using, either CF or SD. The updater will run and the kernel is flashed. When it is done, the device will automatically reboot.
ExperimentalFrom here it all gets a bit wacky. After reboot, the boot menu is shown, probably saying it couldn't find any bootable kernels (unless you prepared well of course). Pressing the Power button doesn't work, so I had to Reset the device again. Not very nice, but the kernel has no SD/CF cards mounted, so these won't get corrupt (no guarantees).
Booting the device with the Zubuntu SD/CF card inserted shows Zubuntu in the boot menu. Pressing the "OK" button starts Zubuntu, at least until the login prompt. Login using "root" and type "startx" to see the desktop. Be aware that the touchscreen needs calibrating, but ts_calibrate bails out with an error here, so that didn't work for me.
Help is needed from here, so please try this and give me your feedback, report problems, share fixes, enhancements etc.
As you know by now, using the "Donate" button from the menu on the left keeps me motivated big time!
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