Backup of bc10-router/u-boot update (No. 1)

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  • 1 (2013-08-09 (Fri) 10:53:20)

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bc10-router/u-boot update

bc10 bc10-router

Updating u-boot †

bc10-router uses the boot image for beagleboard of arago-project, and the version of its u-boot is u-boot-2012.04.01. The version of u-boot can be displayed as shown below.

Code and Commands> This indicates that {HOME}/oe/arago/recipes/u-boot/u-boot_2012.04.01.bb is used for the build process. As {HOME}/oe/arago/recipes/u-boot/u-boot_2012.04.01.inc points out, the mainline of u-boot is downloaded form the master branch of repository, git://git.denx.de/u-boot.git, and several patches are applied for beagleboard. The patches, which are used here are listed below.

• 0001-omap3_beagle-add-usbethaddr-setting-to-enable-networ.patch
  
• 0001-OMAP3-Beagle-Set-BOOTDELAY-to-3.patch
  
• 0002-am335x-am335x-am3517evm-beagleboard-am37x-Add-CONFIG_CMD_AS.patch
  
• 0003-beagleboard-Load-uImage-from-VFAT-by-default.patch
  
• 0004-beagleboard-Load-uImage-to-the-default-kernel-linux.patch
  
• 0001-omap3_evm-Added-function-calls-to-set-volts-speed-on.patch
  
• 0002-omap3evm-Make-the-board-start-at-800MHz.patch
  
• 0003-beagleboard-Make-xM-rev-C-go-to-800MHz.patch
  
  omap3_beagle_config is built by bitbake.
  The patches shown above enable the mainline u-boot to have more functionalities then before. The patched one is capable of using tftpboot with USB-Ethernet adapter. However, the u-boot for ARM devices, which has recently been developed and available at http://git.denx.de/?p=u-boot/u-boot-arm.git, includes such functionalities, and this u-boot is now considered as the mainline.
  
  Therefore, u-boot is going to be updated to u-boot-arm. This update of u-boot promises easier update of u-boot and kernel later on. To update u-boot, kernel is updated form 3.7, and the newer kernel can include DeviceTree that works with ARM architecture.
  
  Caution) The repository of u-boot-arm has only two branches: master and next. Its Tag has not updated for 4 yeas, so it is very difficult to obtain a specific version of u-boot. To work wit a specific version of u-boot, select specific version of u-boot by Tag. The instruction of how to select a version of u-boot is shown later.

How to update u-boot †

This is how to update u-boot. The details are shown below.

Obtaining u-boot-arm from the repository †

Obtain the source code of u-boot-arm from the repository.

Code and Commands>

Obtain u-boot from the respository †

Obtain the 2012 version of u-boot from the repository.

Code and Commands>
After obtaining the source code, set up PATH to Cross Toolchain of ti-sdk-beagleboard-05.05.01.00. Then, execute config for beagleboard.

Code and Commands>
Since the configuration for building beagleboard is completed, execute make to build.

Code and Commands>
Several files are built, yet only u-boot.img is used. Copy u-boot.img to FAT partition of a booting SD file. This is the end of updating process.

version †

To apply the command below, the version of updated u-boot is checked.

Code and Commands>

u-boot commands †

Updated the list of u-boot commands is shown below. This u-boot is capable of booting from tftpboot and nand of OMAP3.

Code and Commands>

The default environment variable of u-boot †

The list of the pre-set environment variables for u-boot is shown below.
To use nEnv.txt, modify the configurations of environment variables.

Code and Commands>

uEnv.txt †

To set up uEnv.txt as shown below, bc10 will boot standardly as well as normally.

Code and Commands> As debugging Suspend/Resume and handing no_console_suspend to kernel as an option, uEnv is used as it is shown below.

Code and Commands>

tftpboot †

u-boot includes and handles OMAP EHC, which is done by linaro. This u-boot can deal with tftoboot, so it can handle a USB-Ethernet adapter.
Its details are written in the document, which is stored at the directory shown below.

Code and Commands> The list of USB-Ethernet adapters, which work with tftpboot, is located at the directory of u-boot-arm/drivers/usb/eith/asx.c. Specifically, these USB-Ethernet adapters have to work with u-boot, which can handle tftpboot. The contents of the list suggest VernderID: ProductID.

Code and Commands> As of January 2013, Buffalo LUA-U2-ATX is easily obtainable in Japan. This USB-Ethernet adapter works with tftpboot.
To check VenderID and ProductID, apply lsusb. Then, its output is displayed as it is shown below,

Code and Commands> The details of how to build tftpboot is available at bc10-router/tftpboot.

Revision History †

• 2013-08-09 This article is initially published.

   

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