| |
| This is a demo implementation of a Linux command line tool to access |
| the U-Boot's environment variables. |
| |
| For the run-time utiltity configuration uncomment the line |
| #define CONFIG_FILE "/etc/fw_env.config" |
| in fw_env.h. |
| |
| For building against older versions of the MTD headers (meaning before |
| v2.6.8-rc1) it is required to pass the argument "MTD_VERSION=old" to |
| make. |
| |
| See comments in the fw_env.config file for definitions for the |
| particular board. |
| |
| Configuration can also be done via #defines in the fw_env.h file. The |
| following lines are relevant: |
| |
| #define HAVE_REDUND /* For systems with 2 env sectors */ |
| #define DEVICE1_NAME "/dev/mtd1" |
| #define DEVICE2_NAME "/dev/mtd2" |
| #define DEVICE1_OFFSET 0x0000 |
| #define ENV1_SIZE 0x4000 |
| #define DEVICE1_ESIZE 0x4000 |
| #define DEVICE2_OFFSET 0x0000 |
| #define ENV2_SIZE 0x4000 |
| #define DEVICE2_ESIZE 0x4000 |
| |
| Current configuration matches the environment layout of the TRAB |
| board. |
| |
| Un-define HAVE_REDUND, if you want to use the utlities on a system |
| that does not have support for redundant environment enabled. |
| If HAVE_REDUND is undefined, DEVICE2_NAME is ignored, |
| as is ENV2_SIZE and DEVICE2_ESIZE. |
| |
| The DEVICEx_NAME constants define which MTD character devices are to |
| be used to access the environment. |
| |
| The DEVICEx_OFFSET constants define the environment offset within the |
| MTD character device. |
| |
| ENVx_SIZE defines the size in bytes taken by the environment, which |
| may be less then flash sector size, if the environment takes less |
| then 1 sector. |
| |
| DEVICEx_ESIZE defines the size of the first sector in the flash |
| partition where the environment resides. |