VAR-SOM-OM44 Ubuntu RN
Introduction
Below instructions corresponds to ubuntu-12.04.TI_GLP16X-VARX release.
Variscite supports its VAR-SOM-OM44 VAR-SOM-OM44 with TI Ubuntu Linux kernel and Ubuntu Precise (12.04) distribution.
The Linux kernel provides support for all on-board peripherals.
Your Ubuntu folder on your CD / FTP contains ready-to-run pre-built image which contain:Kernel, U-boot, Xloader and Ubuntu File system.
Installation
Plug your SD card to your Linux machine, run dmesg and see what device is added (i.e. /dev/sdX)
$ gunzip ubuntu-12.04.TI_GLP16X-VARX.img.gz $ dd if=ubuntu-12.04.TI_GLP16X-VARX.img of=/dev/sdX bs=4M
Boot
The Ubuntu pre-built image will boot automaticlly on power up.
The boot parameters are setup by uEnv.txt file located at the boot partition of the SD card.
Default uEnv.txt file:
setvarargs=setenv bootargs console=ttyO2,115200n8 mem=1G@0x80000000 root=/dev/mmcblk0p2 ro elevator=noop fixrtc eth.ks8851=${ethaddr} eth.smsc=${usbethaddr} phy.smsc.gb_enable=false
loadvarimages=fatload mmc 0:1 0x80000000 uImage.var; fatload mmc 0:1 0x81600000 uInitrd.var
uenvcmd=run loadvarimages; run setvarargs; bootm 0x80000000 0x81600000
- phy.smsc.gb_enable=[false|true] - Enable/Disable Gigabit mode for smsc7500 GB Ethernet port
- eth.ks8851=<mac address> - ks8851 10/100 Ethernet port mac address, read from 'preEnv.txt' file (ethaddr).
- eth.smsc=<mac address> - smsc7500 GB Ethernet port mac address, read from 'preEnv.txt' file (usbethaddr).
System login:
username: variscite
password: password
Ubuntu Kernel Sources
To retrieving the kernel sources use git:
$ git clone git://dev.omapzoom.org/pub/scm/integration/kernel-ubuntu.git $ cd kernel-ubuntu $ git checkout -b working xxx << xxx == check release notes for kernel commit >>
To apply Variscite kernel patch:
$ git apply var-som-om44-ubuntu-12.04.TI_GLP16X-VARX-armhf-omap4.patch
Further explanation on building the kernel and generate a kernel package can be found here.
for example for release GLP168-VAR2:
git clone git://dev.omapzoom.org/pub/scm/integration/kernel-ubuntu.git cd kernel-ubuntu git checkout d8a13c28e3ddc1f7cb098823b883dbc6a02bcb43 git apply git apply var-som-om44-ubuntu-12.04.TI_GLP168-VAR2-armhf-omap4.patch
Note: After compiling and installing new debian packages, rename uImage and uInitrd in /dev/sdX1 to uImage.var and uInitrd.var
U-Boot Sources
To retrieving the U-Boot sources use git:
$ git clone git://git.linaro.org/boot/u-boot-linaro-stable.git $ cd u-boot-linaro-stable $ git checkout -b working 5b752a1e0528aa29f5bd4cde0905c8b604c56255
To apply Variscite U-Boot patch:
git apply var-som-om44-u-boot-linaro-VARX.patch
To build U-Boot sources:
$ make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- omap4_var_som
To install U-Boot and MLO on boot partition of the SD card:
$ sudo mount /dev/sdbX1 /mnt $ cp MLO u-boot.bin /mnt $ sudo umount /dev/sdbX1
Apply your kernel
On the target.
make sure your are connected to the network with lan or wireless lan. Use ifconfig for that.
Copy files from your build system:
$ cd ~/var-som-om44.deb/ $ scp <yourname>@<your build system ip>:<your build folder>/*.deb ./
Unmount your boot partition
sudo umount /dev/mmcblk0p1
Install Debian pacakges:
sudo dpkg -i *3.4.0-<release_version>_armhf.deb
Rename the images name
$ sudo mv /media/boot/uInitrd /media/boot/uInitrd.var $ sudo mv /media/boot/uImage /media/boot/uImage.var $ sync
Reboot your target to get new kernel changes.
Capacitive Touch Panel support
To enable Capacitive touch panel in kernel image, modify debian.ti-omap4/config/config.common.ubuntu :
CONFIG_TOUCHSCREEN_CTW6120=y
OTG as Host
To initiate the OTG port at host mode you need to "insmod" some USB gadget module first. for example:
$ sudo modprobe g_printer