| |
| This is a demo implementation of a Linux command line tool to access |
| the U-Boot's environment variables. |
| |
| Configuration is 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 ENV1_SIZE 0x4000 |
| #define DEVICE1_ESIZE 0x4000 |
| #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. The |
| DEVICEx_NAME constants define which MTD character device(s) is (are) |
| to be used to access the environment. If HAVE_REDUND is undefined, |
| DEVICE2_NAME is ignored, as is ENV2_SIZE and DEVICE2_ESIZE. 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. It is assumed that the |
| environment is located in the first ENVx_SIZE bytes of the device |
| DEVICEx_NAME. |