CM-T3730: Android: Getting started

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Introduction

The Android Demo filesystem image for CM-T3730 is based on Android 4.1.2 Jelly Bean with SGX (3D graphics acceleration) support. The CompuLab Android Demo package for CM-T3730 includes ready to run Demo Android filesystem image and Linux kernel based on 2.6.37 version.

Admolition note.png We do not recommend using Android Demo Image on CM-T3730 devices with less then 256MB of RAM.

Preparation steps

  • Obtain a Linux PC workstation.
  • Get a USB Card reader and a micro SD Card. Use either the micro SD card, supplied with the CM-T3730 Evaluation kit, or create a new one.
  • Plug the USB SD Card reader to a host Linux PC. Insert the micro SD Card into the USB Card reader. From now we assume the device name of the MMC/SD card on your Linux PC is /dev/sdc.
  • Download the Android Demo package for CM-T3730 from CompuLab website. Unzip the package to a directory on your host workstation.
  • All image files mentioned below can be found in images subdirectory of the Demo package.

Intalling X-Loader and U-Boot

  • Create two partitions (FAT32 partition for X-Loader, U-Boot and Linux kernel and ext4 partition for root filesystem) as described in the Default MMC/SD Card mapping article:
Disk /dev/sdc: 8035 MB, 8035237888 bytes
32 heads, 32 sectors/track, 15326 cylinders, total 15693824 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x710ab397

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *        2048      242959      120456    c  W95 FAT32 (LBA)
/dev/sdc2          243712    15693823     7725056   83  Linux
  • If you use the micro SD card, supplied with the CM-T3730 Evaluation kit, that has already been pre-partitioned as required, proceed to the Installing Android section.
  • Otherwise, download the U-Boot package for CM-T3730 from CompuLab website. Unzip the package to a directory on your host workstation.
  • Format for FAT32 partition:
sudo mkfs.vfat -F 32 -n boot /dev/sdc1
  • Mount the partition under /media/boot location:
sudo mkdir -p /media/boot
sudo mount /dev/sdc1 /media/boot
  • Copy the X-Loader binary on to the boot partition and rename it as MLO. It is essential that the MLO will be the first file created on the MMC/SD card.
cp /path/to/cm-t3730-u-boot/images/x-loader.bin /media/boot/MLO
  • Copy U-Boot and Linux kernel images on to the boot partition:
cp /path/to/cm-t3730-u-boot/images/u-boot.bin /media/boot/
cp /path/to/cm-t3730-android-demo/images/uImage-cm-t3730.bin /media/boot/uImage

Installing Android

  • Format ext4 partition:
sudo mkfs.ext4 -L rootfs /dev/sdc2
  • Mount the partition under /media/boot location:
sudo mkdir -p /media/rootfs
sudo mount /dev/sdc2 /media/rootfs
  • Extract the Android Demo root filesystem on to that partition:
sudo tar -xpf /path/to/cm-t3730-android/images/Android-image-cm-t3730.tar.bz2 -C /media/rootfs && sync
  • Unmount all micro SD card partitions:
sudo umount /dev/sdc1; sudo umount /dev/sdc2
  • Remove the micro SD card from the SD card reader and insert into the CM-T3730 micro SD card socket (P5).
  • Continue to the After Installation section.

After Installation

  • Connect the host PC to the SB-T35 base-board (connector P12) via the serial cable supplied with the evaluation kit.
  • Start terminal emulation software on your PC. Set baud rate to 115200 bps, 8 bit per frame, 1 stop bit, no parity, no flow control.
  • Connect the DataImage SCF0403 LCD display to the CM-T3730 evaluation system. The CM-T3730 Android Demo image is optimized to work with this display.
  • Turn on the CM-T3730 evaluation system. The U-Boot boot-loader will start and you will get a command prompt.
  • Set the bootargs environment variable:
setenv bootargs "console=ttyO2,115200n8 androidboot.console=ttyO2 root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait init=/init ip=off \
 omap_vout.vid1_static_vrfb_alloc=y vram=8M omapfb.vram=0:8M omapdss.def_disp=lcd omapfb.mode=dvi:1024x768-16 cm_t3x_lcd=dataimage"
  • To boot Android Demo image type:
CM-T3x # setenv bootdelay 3
CM-T3x # setenv bootcmd "mmc rescan; fatload mmc 0 82000000 uImage; bootm"
CM-T3x # saveenv
CM-T3x # boot

See also

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