Just Started Micro2440

November 10, 2010

How to Boot Android from an SD Card

Filed under: Uncategorized — iemasen @ 8:22 am

Steps below are a guideline for booting the Android OS on the Micro2440 SDK with 256M.

Step 1 – Downloading an Android Kernel

[1] UBoot-256MB
[2] Android Kernel
[3] Android Filesystem

Step 2 – Setting Up the ARM Toolchain

If you haven’t set up the ARM Toolchain, follow the guideline in this link.

Step 3 – Partition the SD Card

Refer to How to Partition an SD Card for the steps.

Step 4 – Mount the SD Card

My SD card is mounted using the following names:

/dev/sdb2  –> /media/boot
/dev/sdb3 –> /media/rootfs

The name of boot and rootfs were given during the partition step. It’s up to you to give any names.

Step 5 – Compiling Kernel Image

/android/kernel> cp config_mini2440 .config

Run the menuconfig, but don’t change anything. Just exit from the menuconfig.

/android/kernel> make ARCH=arm menuconfig

Start to compile the Kernel image.

/android/kernel> make ARCH=arm uImage

Step 6 – Copy the Kernel uImage and Filesystem to the SD Card

The resulted uImage can be found in arch/arm/boot directory.

/android/kernel/arch/arm/boot> cp uImage /media/boot/.

Then, copy the contents of fs directory to /media/rootfs. We need to do this first before installing the kernel modules to the filesystem.

/android/fs> cp * /media/rootfs/.

Step 7 – Create Kernel Modules

/android/kernel> make ARCH=arm INSTALL_MOD_PATH=/media/rootfs modules

If you jump directly to modules_install without compiling modules first, you will get an error saying modules.order cannot be found.

/android/kernel> make ARCH=arm INSTALL_MOD_PATH=/media/rootfs modules_install

Step 8 – Setting Up  the Minicom

If we don’t have the Minicom available in our Linux system, then we need to install it first.

> sudo apt-get install minicom

Once it’s installed, we can invoke it from the shell prompt.

> minicom -s

Select “Serial Port Setup”. Enter the following information:

Serial Device: /dev/ttyS0
Bps/Par/Bits: 115200 8N1
Hardware Flow Control: No
Software Flow Control: No

Then select “Exit” and press Enter. Don’t select “Exit from Minicom”, otherwise you are out of minicom.

Step 9 – Downloading UBoot to NAND

Tell vivi that you need 242360 bytes space in the RAM to load something from the USB, starting at 0×31000000. Few examples on the internet ask you to load images to the RAM location 0×32000000. It works fine for small image. For larger image, you must go to a lower address space, such as 0×31000000.

Supervivi> load ram 0×31000000 242360 u

On another shell window, use following command to download u-boot into the RAM of Micro2440.

Supervivi> sudo ./s3c2410_boot_usb UBoot-256MB.bin

The process of downloading the u-boot to the RAM is shown in Figure .

Transferring u-boot from the Linux Host the RAM

Now we are ready to write u-boot from the RAM to NAND flash. It involves a few steps.

Transferring u-boot from the RAM to the NAND

First, we need the execute the u-boot in the RAM, instead of Supervivi in the NOR.

Supervivi> go 0×31000000

When seeing “Hit any key to stop autoboot,” press any key on the keyboard. The prompt shall change from Supervivi> to MINI2440 #.

Next, we need to get the information about the NAND flash.

MINI2440 # nand info

Erase everything on the NAND flash.

MINI2440 # nand scrub

Now create a new partition table.

MINI2440 # nand createbbt

The previous command will create 4 partitions: u-boot, env, kernel and root. You can check the partition list by executing the following command.

MINI2440 # mtdparts

Once we have the NAND flash is ready to be written, now we can start transferring the u-boot from the RAM to the u-boot partition in the NAND.

MINI2440 # nand write 0×31000000 u-boot

This step can be viewed as

Transferring the u-boot from the RAM to the NAND

Now we’re going to boot from the NAND. Move the switch to NAND position and reboot Micro2440. Now you shall see all u-boot informations on the minicom window. Hit any key when you see the promption “Hit any key to stop autoboot.

Step 10 – Set the Boot Environment

This step will copy the kernel from the SD card partition 2 (mmcblk0p2) to the RAM address 0×31000000 and run the booting process from the RAM.

MINI2440 # setenv bootcmd mmcinit \; ext2load mmc 0:2 0×31000000 uImage \; bootm 0×31000000

We also need to inform the u-boot where the rootfs location is and other configurations.

MINI2440 # setenv bootargs root=/dev/mmcblk0p3 rootfstype=ext3 mini2440=1tb rootdelay=3 init=/linuxrc

The description of the bootargs parameters can be seen in this Table.

ENV BOOT Parameters Description
bootargs noninitrd
bootargs mini2440 = Type of display
0 = 3.5 “display N35
1 = 7 “Display
2 = VGA Board
3 = 3.5-inch screen T35
4 = 5.6 “display Innolux
t = Touchscreen
b = Back Light
bootargs rootfstype = File system with rootfs
bootargs root = Description / Drive the rootfs (eg / dev/sda1)
bootargs rw Mount parameters rw = Read / Write, RO = Read Only
bootargs rootwait Waiting for the file system before the boot process continues
bootargs init = Starts the specified program completed after the start of the kernel is.

Now save the environment.

MINI2440 # saveenv

Then, reboot the system.

MINI2440 # reset

You should see the Android OS as shown in the Figure below.

References

[1] Manual for Compiling Android for Mini2440

[2] Micro2440

[3] HOWTO: Booting from SD Card Using U-Boot

[4] Running the Android OS on the Mini2440

[5] …

 

 

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2 Comments »

  1. Hello, could you please tell me know if my 1GB SD Card is enough to stock Android OS? Thanks so much!

    Pascal.

    Comment by Pascal — January 22, 2011 @ 5:58 pm

  2. thanks a lot for your tut, it was a big help,
    I’ve been using the W35 display and when I boot up the display is 90 degrees turned so I can nly see half of it.
    What should I change to get the display wright part from entering 6tb as mini2440 bootargs.

    and thanks

    Comment by Ramzi — May 9, 2012 @ 4:11 pm


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