1 2This is a demo implementation of a Linux command line tool to access 3the U-Boot's environment variables. 4 5For the run-time utiltity configuration uncomment the line 6#define CONFIG_FILE "/etc/fw_env.config" 7in fw_env.h. 8 9See comments in the fw_env.config file for definitions for the 10particular board. 11 12Configuration can also be done via #defines in the fw_env.h file. The 13following lines are relevant: 14 15#define HAVE_REDUND /* For systems with 2 env sectors */ 16#define DEVICE1_NAME "/dev/mtd1" 17#define DEVICE2_NAME "/dev/mtd2" 18#define DEVICE1_OFFSET 0x0000 19#define ENV1_SIZE 0x4000 20#define DEVICE1_ESIZE 0x4000 21#define DEVICE2_OFFSET 0x0000 22#define ENV2_SIZE 0x4000 23#define DEVICE2_ESIZE 0x4000 24 25Current configuration matches the environment layout of the TRAB 26board. 27 28Un-define HAVE_REDUND, if you want to use the utlities on a system 29that does not have support for redundant environment enabled. 30If HAVE_REDUND is undefined, DEVICE2_NAME is ignored, 31as is ENV2_SIZE and DEVICE2_ESIZE. 32 33The DEVICEx_NAME constants define which MTD character devices are to 34be used to access the environment. 35 36The DEVICEx_OFFSET constants define the environment offset within the 37MTD character device. 38 39ENVx_SIZE defines the size in bytes taken by the environment, which 40may be less then flash sector size, if the environment takes less 41then 1 sector. 42 43DEVICEx_ESIZE defines the size of the first sector in the flash 44partition where the environment resides. 45