Lanner MR-320 - Manual (Page 15)

12
Building the Bootloader Image
Chapter 4
Network Application Platforms
Chapter 4:
Building the Bootloader
Image
Building the U-boot image
To rebuild u-boot for the EM-8230 board, run the following
commands to compile the bootloader configuration file in
the u-boot directory whose path is bootloader/u-boot/:
It will create a boot image file: u-boot-MR320.bin.
Updating the U-boot Image
There are two u-boot images in flash– the failsafe
bootloader and the normal bootloader. The failsafe
bootloader is programmed by Lanner before the board is
shipped and cannot be updated. The failsafe bootloader
provides a means to recover from a failed loading of the
bootloader. The board also contains a normal bootloader
as well, and that is upgradable. To upgrade the bootloader,
, put the new bootloader image onto a compact flash card,
insert the card to the Main board, and power it up.
Reset the board. It will boot up with the new bootloader.
Another method is through the tftp over the network:
MR320# cd /bootloader/u-boot
MR320# make MR320_config
MR320# make
The physical address of the flash is: 0xbf400000
MR320#tftp 100000
MR320#run bootloader_flash_update
And then reset the board.
Note: Remember to configure the Ethernet port
first by setting the following variables:
Below is the physical address of the flash memory and the
SDRAM for your reference:
You could also accomplish the update through the serial
port:
Recovering from a failsafe bootload
If booting from the normal bootloader fails, the failsafe
bootloader can be used to recover the normal bootloader
image. You can boot up with the failsafe bootloader
image to recover the normal bootloader when it cannot
bootup successfully.
Adjust jumper JP5 to Failsafe bootloader (refer to jumper
settings, Chapter 3) on the main board. This will select
failsafe bootloader to bootup, and then power on the
board. The failsafe bootloader image should now boot
and press “Crtl - C” to interrupt factory test. The bootloader
prompt should identify itself as the failsafe bootloader.
Following the instructions below to update normal-mode
bootloader:
Power on the system, press “ctrl - C” while the following
messages are displayed during the booting process:
MR320#setenv ipaddr 192.168.0.2
MR320#setenv serverip 192.168.0.1
MR320#saveenv
env
Runtime
Bootloader
64K
7808K
320K
0xbfc0 0000
0xbfbe 0000
0xbf45 0000
0xbf40 0000
Load the image into memory with the command:
MR320# fatload ide 0 100000
filename>
Burn the new bootloader image with the command:
MR320# run bootloader_flash_update
Nuke environment variables on the flash.
MR320# run nuke_env
MR320# loadb 100000
## Total Size = 0x00795670 = 7951984 Bytes
## Start Addr = 0x00b000000