| wdenk | 34b613e | 2002-12-17 01:51:00 +0000 | [diff] [blame^] | 1 | |
| 2 | This is a demo implementation of a Linux command line tool to access |
| 3 | the U-Boot's environment variables. |
| 4 | |
| 5 | Configuration is done via #defines in the fw_env.h file. The |
| 6 | following lines are relevant: |
| 7 | |
| 8 | #define HAVE_REDUND /* For systems with 2 env sectors */ |
| 9 | #define DEVICE1_NAME "/dev/mtd1" |
| 10 | #define DEVICE2_NAME "/dev/mtd2" |
| 11 | #define ENV1_SIZE 0x4000 |
| 12 | #define DEVICE1_ESIZE 0x4000 |
| 13 | #define ENV2_SIZE 0x4000 |
| 14 | #define DEVICE2_ESIZE 0x4000 |
| 15 | |
| 16 | Current configuration matches the environment layout of the TRAB |
| 17 | board. |
| 18 | |
| 19 | Un-define HAVE_REDUND, if you want to use the utlities on a system |
| 20 | that does not have support for redundant environment enabled. The |
| 21 | DEVICEx_NAME constants define which MTD character device(s) is (are) |
| 22 | to be used to access the environment. If HAVE_REDUND is undefined, |
| 23 | DEVICE2_NAME is ignored, as is ENV2_SIZE and DEVICE2_ESIZE. ENVx_SIZE |
| 24 | defines the size in bytes taken by the environment, which may be less |
| 25 | then flash sector size, if the environment takes less then 1 sector. |
| 26 | DEVICEx_ESIZE defines the size of the first sector in the flash |
| 27 | partition where the environment resides. It is assumed that the |
| 28 | environment is located in the first ENVx_SIZE bytes of the device |
| 29 | DEVICEx_NAME. |