Install and Compile Linux

Create Working Directory and Decompress Source File

• Create a working directory (“WORK DIR” is used as user working directory):

    $ mkdir <WORKDIR> -p

• Decompress the source code from directory “05-Linux_Source” in the CD-ROM to the working directory:

    $ cd <WORKDIR>
    $ tar xvjf /media/cdrom/05-Linux_Source/U-Boot/u-boot.tar.bz2
    $ tar xvjf /media/cdrom/05-Linux_Source/Linux_Kernel/linux-3.2.0.tar.bz2
    $ tar xvjf /media/cdrom/05-Linux_Source/Rootfs/myd-am335x_rootfs.tar.bz2
    $ tar xvjf /media/cdrom/05-Linux_Source/Rootfs/myd-am335x_rootfs.tar.bz2

1.4.2 Install Cross Compiler Tools

• Install necessary tools:

    $ sudo apt-get install build-essential git-core libncurses5-dev
    $ sudo apt-get install flex bison texinfo zip unzip zlib1g-dev gettext
    $ sudo apt-get install gperf libsdl-dev libesd0-dev libwxgtk2.6-dev
    $ sudo apt-get install uboot-mkimage
    $ sudo apt-get install g++ xz-utils

• Decompress cross compiler tool to the specified directory (Here decompress it to “WORK DIR” as an example):

    $ cd <WORKDIR>
    $ cd /media/cdrom/03-Tools/Cross_compiler
    $ tar xvjf gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux.tar.bz2

• Add environment variables:

    $ export PATH=$PATH: <WORKDIR>/gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux/bin
    $ export CROSS_COMPILE=arm-linux-gnueabihf-

Install Uboot Source and Compile

• Build configure:

Note:Here we use the u-boot for 4.3” LCD for example. If you want to use the u-boot for 7” LCD or HDMI, please use the corresponding configuration file:

Table 1-2

    $ cd  <WORKDIR>/u-boot
    $ make  distclean    
    $ make  myd_am335x_lcd4.3_config 
    $ make

After accomplishing above operations, the system will generate boot code image “MLO” and “u-boot.img” file in the current directory.

• Boot configure

There are several configurations of MYD-AM335X, must to set the right argument according to the actual situation of the hardware. The following is a relationship between the u-boot parameters and hardware:

Table 1-3

Table 1-4

For example, the following command at the U0boot command line is means 4.3-inch resistive touch screen and 256M memory is set.

    # setenv optargs board-am335xevm.display_mode=lcd7ir mem=256M
    # saveenv

Install and Compile Linux Kernel Source Code

• Install necessary tools:

    $ sudo apt-get install ncurses-dev
    $ sudo apt-get install uboot-mkimage

• Configure the kernel:

    $ cd <WORKDIR>/linux-3.2.0
    $ make distclean
    $ make myd_am335x_defconfig

• Compile the kernel:

    $ make uImage

After executing the above operations, uImage will be generated under arch/arm/boot/.

Compile File System

• Copy necessary tools from the CD:

    $ cp /media/cdrom/03-Tools/mk-ubi-256mb <WORKDIR>
    $ cp /media/cdrom/03-Tools/mk-ubi-512mb <WORKDIR>
    $ cp /media/cdrom/03-Tools/ubinize_256M.cfg <WORKDIR>
    $ cp /media/cdrom/03-Tools/ubinize_512M.cfg <WORKDIR>

If a tools can’t execut, use “chmod” add executable permission, for example:

    $ chmod +x <WORKDIR>/mk-ubi-256mb

• Make filesystem for 256M NandFlash:

    $ cd  <WORKDIR>
    $ ./mk-ubi-256mb myd-am335x_rootfs

After executing the above operations, the “ubi.img” is the ubi image file of the 256M NandFlash can be found under the current directory.

• Make filesystem for 512M NandFlash:

    $ cd  <WORKDIR>
    $ ./mk-ubi-512mb myd-am335x_rootfs

After executing the above operations, the “ubi.img” is the ubi image file of the 512M NandFlash can be found under the current directory.