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Adaptation/Touchpad
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To compile the kernel for the touchpad you should have an arm cross compiler environnement set up and use the following comamnds : | To compile the kernel for the touchpad you should have an arm cross compiler environnement set up and use the following comamnds : | ||
| − | make | + | make tenderloin_meego_defconfig |
make CONFIG_NO_ERROR_ON_MISMATCH=y uImage | make CONFIG_NO_ERROR_ON_MISMATCH=y uImage | ||
Revision as of 11:09, 21 February 2012
Contents |
HP Touchpad Device Adaptation for Mer
Booting
In order to boot Mer on the HP touchpad we create a new LVM under webos named /dev/store/meego and unpack one of armv7hl images in it.
Kernel
The WebOS kernel is a 2.6.35 with some patches. It's all available from palm here.
The default kernel configuration will boot Meego but won't get you very far as it's lacking some essential elements for systemd :
- cgroupfs support
- accept4 support
- 'active' sysfs attribute for tty0 and console device
A kernel with all the patches applied is available here
To compile the kernel for the touchpad you should have an arm cross compiler environnement set up and use the following comamnds :
make tenderloin_meego_defconfig make CONFIG_NO_ERROR_ON_MISMATCH=y uImage
Initramfs
In order to boot from an LVM volume we need an initramfs. I created a very basic one that just mounts the partition and then switches to it.
You can find the initramfs source here
Creating the boot image
The touchpad bootloader can directly boot an image if it's properly formatted. The image needs to be a multi-image uimage containing a kernel uimage and an initramfs uimage. To create such an image here are the steps :
- Create a gzipped cpio initramfs image
cd initramfs find . -print0 | cpio --null -ov --format=newc | gzip -9 > ../initramfs.cpio.gz cd ..
- Create the uimage for the initramfs
mkimage -A arm -O Linux -T ramdisk -n 'Meego boot initrd' -C none -e 0 -a 0 -d initramfs.cpio.gz initramfs.uImage
- Combine both images into one uImage
mkimage -A arm -O Linux -T multi -n 'Meego boot' -C none -e 0 -a 0 -d linux-2.6.35/arch/arm/boot/uImage:initramfs.uImage meego.uImage
Now you can boot this image using novacom (downloadable here) To boot using nvacom first shutdown the touchpad, then plug the usb cable to your computer and the touchpad while holding the volume up button. You should see the USB logo on the touchpad. Now you can issue the following command :
novacom boot mem:// < meego.uImage
