View source for CM-T335: Linux: Manual Linux Installation

== Introduction ==
This article provides an introduction on how to install the following on the CompuLab CM-T335 System-on-Module / Computer-on-Module NAND internal storage device:
* Example user space (root filesystem) image.
* Linux kernel images.

== Preparation steps ==
* Obtain a PC workstation with a serial communication port or a free USB 2.0 Host port.
* For networked installation you need to install a TFTP server on the host PC. For Windows machines we recommend [http://tftpd32.jounin.net/ TFTPD32] included in the Linux package for CM-T335 (link below).
* Download the Linux package for CM-T335 from [http://compulab.co.il/products/computer-on-modules/cm-t335/#devres CompuLab website]. Unzip the package to a directory on your host workstation.
* All image files mentioned below can be found in the {{filename|images}} subdirectory.
* Connect the host PC to the SB-T335 base-board (connector P11) via the serial cable supplied with the evaluation kit.
* Start terminal emulation software on your PC with the following serial port settings:
<blockquote>
{{:SB-SOM: serial port parameters table}}
</blockquote>
* Turn on the CM-T335 evaluation system. The U-Boot boot-loader will start and you will get a command prompt.
*: {{Note|If the boot settings of your CM-T335 are different than the default, you may need to press and hold '''Ctrl-C''' while turning the CM-T335 on, in order to get command prompt.}}

== Boot into the installation environment (ramdisk) ==
The first step in CM-T335 Linux installation is starting the installation environment (Linux kernel and Ramdisk image).
This can be done using one of the following media:
* [[#Using installation environment on MMC/SD card|MMC/SD card]]
* [[#Using installation environment on USB storage device|USB storage device]]
* [[#Using installation environment from TFTP server|Network TFTP server]]

=== Using installation environment on MMC/SD card ===
* Copy the following files from [http://compulab.co.il/products/computer-on-modules/cm-t335/#devres Linux package for CM-T335] to the root directory on the first partition of the MMC/SD card:
*: {{filename|kernel.img}}, {{filename|am335x-sbc-t335.dtb}}, {{filename|ramdisk.img}}, {{filename|rootfs.tar.bz2}}, {{filename|am335x-sbc-t335.dtb}}, {{filename|zImage-cm-t335}}
{{Note|The partition has to be formatted with either ext2/3/4 or FAT16/32 file system.}}
* Insert the MMC/SD card into the SD socket (P23) on the SB-T335.
* Use the following U-boot commands to boot the installation environment on the CM-T335:
<pre>
CM-T335 # mmc dev 0
CM-T335 # mmc rescan
CM-T335 # load mmc 0 $loadaddr kernel.img && load mmc 0 0x81000000 ramdisk.img && load mmc 0 0x83000000 am335x-sbc-t335.dtb
CM-T335 # setenv bootargs "root=/dev/ram0 rw ramdisk_size=16384 console=ttyO0,115200"
CM-T335 # bootz $loadaddr 0x81000000 0x83000000
</pre>
* Continue to the [[#Install Kernel and Debian Linux Images | Install Kernel and Debian Linux Images]] section.

=== Using installation environment on USB storage device ===
* Copy the following files from [http://compulab.co.il/products/computer-on-modules/cm-t335/#devres Linux package for CM-T335] to the root directory on the first partition on the USB storage device:
*: {{filename|kernel.img}}, {{filename|am335x-sbc-t335.dtb}}, {{filename|ramdisk.img}}, {{filename|rootfs.tar.bz2}}, {{filename|am335x-sbc-t335.dtb}}, {{filename|zImage-cm-t335}}
{{Note|The partition has to be formatted with either ext2/3/4 or FAT16/32 file system.}}
* Plug the USB storage device into:
** USB host connector (either P25, P26, P27 or P28) on SB-T335 if the CM-T335 module has U4 configuration or
** USB OTG connector (P19) on SB-T335 if the CM-T335 module has U1 configuration
* Use the following U-boot commands to boot the installation environment on the CM-T335:
<pre>
CM-T335 # usb start
CM-T335 # load usb 0:1 $loadaddr kernel.img && load usb 0:1 0x81000000 ramdisk.img && load usb 0:1 0x83000000 am335x-sbc-t335.dtb
CM-T335 # setenv bootargs "root=/dev/ram0 rw ramdisk_size=16384 console=ttyO0,115200"
CM-T335 # bootz $loadaddr 0x81000000 0x83000000
</pre>
* Continue to the [[#Install Kernel and Debian Linux Images | Install Kernel and Debian Linux Images]] section.

=== Using installation environment from TFTP server ===
* Connect the CM-T335 Ethernet port (connector P2 on the SB-T335) to your local network.
* Put {{filename|kernel.img}}, {{filename|am335x-sbc-t335.dtb}} and {{filename|ramdisk.img}} from [http://compulab.co.il/products/computer-on-modules/cm-t335/#devres Linux package for CM-T335] to a location accessible by the TFTP server:
*: - On Windows machine: copy {{filename|kernel.img}}, {{filename|am335x-sbc-t335.dtb}} and {{filename|ramdisk.img}} to the same folder and point the TFTP server to that folder
*: - On Linux machine: copy {{filename|kernel.img}}, {{filename|am335x-sbc-t335.dtb}} and {{filename|ramdisk.img}} to the TFTP server root directory, usually {{filename|/tftpboot}} or {{filename|/tftproot}}.
* You can use U-boot {{cmd|dhcp}} command to obtain IP address or manually set {{parameter|ipaddr}} environment variable:
<pre>
CM-T335 # setenv ipaddr <CM-T335 ip address>
</pre>
* Set the {{parameter|serverip}} environment variable and save the new environment:
<pre>
CM-T335 # setenv serverip <tftp server host ip address>
CM-T335 # saveenv
</pre>
* Use the following U-Boot commands to boot Linux on CM-T335:
<pre>
CM-T335 # setenv bootargs "root=/dev/ram0 ramdisk_size=16384 console=ttyO0,115200"
CM-T335 # tftpboot $loadaddr kernel.img && tftpboot 0x81000000 ramdisk.img && tftpboot 0x83000000 am335x-sbc-t335.dtb
CM-T335 # bootz $loadaddr 0x81000000 0x83000000
</pre>
* Continue to the [[#Install Kernel and Debian Linux Images | Install Kernel and Debian Linux Images]] section.

== Install Kernel and Debian Linux Images ==
After the ramdisk image is loaded the Linux command line prompt will appear.<br>
The next step is installing the kernel and Debian Linux images. Any one of the following media can be used as a source for installation:
* [[#Mount an MMC/SD Card|MMC/SD Card]]
* [[#Mount a USB Storage Device|USB storage device]]
* [[#Mount an NFS drive|NFS drive]]

=== Mount an MMC/SD Card ===
* Insert the MMC/SD card into the SD socket (P23) on the SB-T335.
{{Note|The SB-T335 does not have an SD card detect functionality and therefore the micro SD card must be plugged in before the Linux boot process starts.
If Linux has already booted before the SD card has been plugged in, then please repeat the [[#Boot into the installation environment (ramdisk) | Boot into the installation environment]] section.}}
* The MMC/SD card is mounted automatically under /media/mmcblk0pX. Where X is the partition number.
* If for some reason the MMC/SD card hasn't been mounted automatically, use the following mount command:
<pre>
root@compulab:~# mkdir -p /media/mmcblk0pX && mount /dev/mmcblk0pX /media/mmcblk0pX
</pre>
* Continue to the [[#Install Images | Install Images]] section.

=== Mount a USB Storage Device ===
* Plug the USB storage device to any USB host connector (either P25, P26, P27 or P28) on SB-T335 if the CM-T335 module has U4 configuration or to USB OTG connector (P19) on SB-T335 if the CM-T335 module has U1 configuration.
* The USB device is mounted automatically under /media/sdXY. Where X is the device letter and Y is the partition number.
* If for some reason the USB storage device hasn't been mounted automatically, use the following mount command:
<pre>
root@compulab:~# mkdir -p /media/sdXY && mount /dev/sdXY /media/sdXY
</pre>
* Continue to the [[#Install Images | Install Images]] section.

=== Mount an NFS drive ===
* Connect the CM-T335 Ethernet port (connector P2 on the SB-T335) to your local network.
* Copy the {{filename|rootfs.tar.bz2}}, {{filename|am335x-sbc-t335.dtb}} and the {{filename|zImage-cm-t335}} from the [http://compulab.co.il/products/computer-on-modules/cm-t335/#devres Linux package for CM-T335] to a directory exported through NFS.
* Obtain an IP address for the CM-T335:
** Using DHCP:<pre>root@compulab:~# ifup `basename /sys/class/net/eth?`</pre>
** If you do not have a DHCP server, you can set a static IP address using {{cmd|ifconfig}}:<pre>root@compulab:~#  ifconfig `basename /sys/class/net/eth?` <ip address></pre>
* Mount the NFS share containing the {{filename|uImage-cm-t335}}, and the {{filename|rootfs.tar.bz2}} files:
<pre>
root@compulab:~#  mount -o nolock <host ip>:/path/to/nfs/share /mnt/net
</pre>
* Continue to [[#Install Images | Install Images]] section.

=== Install Images ===
Once the ramdisk image is loaded and the media containing the CM-T335 Kernel and Debian Linux images is mounted, the installation can proceed:

* In this subsection the term {{filename|/mount/point}} can be:
** {{filename|/mnt/net}} if NFS is used
** {{filename|/media/mmcblk0pX}} if an MMC/SD card is used, where X is the partition number
** {{filename|/media/sdXY}} if USB storage is used, where X is the USB drive letter and Y is the partition number.

* Format the NAND flash kernel partition and write the kernel image onto it:
<pre>
root@compulab:~# flash_erase /dev/mtd5 0 0
root@compulab:~# nandwrite -p /dev/mtd5 /mount/point/zImage-cm-t335
</pre>
* Format the NAND flash device tree partition and write the device tree image onto it:
<pre>
root@compulab:~# flash_erase /dev/mtd3 0 0
root@compulab:~# nandwrite -p /dev/mtd3 /mount/point/am335x-sbc-t335.dtb
</pre>
* Format the NAND flash root filesystem partition:
<pre>
root@compulab:~# ubiformat /dev/mtd6
</pre>
* Attach the NAND flash root filesystem partition:
<pre>
root@compulab:~# ubiattach -m 6 -d 0
</pre>
* Create a ubi volume and name it "rootfs":
<pre>
root@compulab:~# ubimkvol /dev/ubi0 -m -N rootfs
</pre>
* Mount the ubi volume:
<pre>
root@compulab:~# mkdir -p /media/rootfs && mount -t ubifs ubi0:rootfs /media/rootfs
</pre>
* Extract the content of {{filename|rootfs.tar.bz2}} onto the /media/rootfs:
<pre>
root@compulab:~# tar --numeric-owner -xpf /mount/point/rootfs.tar.bz2 -C /media/rootfs && sync
</pre>
* Unmount the ubi volume:
<pre>
root@compulab:~# umount /media/rootfs
</pre>
* Reboot the CM-T335 Evaluation system.

== After Installation ==
{{Note|If the boot settings of the CM-T335 are different than default, you may need to press and hold '''Ctrl-C''' while turning the CM-T335 on, in order to get command prompt.}}

* Select video output.
** To enable LCD video output: <br><pre>CM-T335 # setenv set_display 'fdt rm /panel/display-timings/dvi; fdt rm /panel/display-timings/lvds'</pre><br>
** To enable LVDS video output:<br><pre>CM-T335 # setenv set_display 'fdt rm /panel/display-timings/dvi; fdt rm /panel/display-timings/lcd'</pre><br>
** To enable DVI video output: <br><pre>CM-T335 # setenv set_display 'fdt rm /panel/display-timings/lcd; fdt rm /panel/display-timings/lvds'</pre><br>
* Select Bluetooth or can bus.
** To enable Bluetooth: <br><pre>CM-T335 # setenv set_blue_can 'fdt rm d_can0; fdt rm d_can1'</pre><br>
** To enable CAN bus: <br><pre>CM-T335 # setenv set_blue_can 'fdt set serial1 status disab; fdt rm /ocp/spi/wlcore'</pre><br>
* Set the initial environment variables:
<pre>
CM-T335 # setenv loadimage 'nand read ${loadaddr} 900000 400000 && nand read 83000000 400000 10000'
CM-T335 # setenv update_fdt 'fdt addr 83000000; run set_display; run set_blue_can'
CM-T335 # setenv bootcmd 'run loadimage && run update_fdt; bootz ${loadaddr} - 83000000'
CM-T335 # setenv bootargs console=ttyO0,115200n8 root=ubi0:rootfs rw rootfstype=ubifs ubi.mtd=rootfs
CM-T335 # saveenv
</pre>
* To boot Linux, type:
<pre>
CM-T335 # boot
</pre>

== See also ==
* [[CM-T335: Linux: Debian]]
* [[CM-T335: Linux: Kernel|Linux Kernel for CM-T335]]
* [[Linux: Development for ARM modules]]

[[Category:Linux]]
[[Category:CM-T335]]