1 2This is a demo implementation of a Linux command line tool to access 3the U-Boot's environment variables. 4 5Configuration is done via #defines in the fw_env.h file. The 6following 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 16Current configuration matches the environment layout of the TRAB 17board. 18 19Un-define HAVE_REDUND, if you want to use the utlities on a system 20that does not have support for redundant environment enabled. The 21DEVICEx_NAME constants define which MTD character device(s) is (are) 22to be used to access the environment. If HAVE_REDUND is undefined, 23DEVICE2_NAME is ignored, as is ENV2_SIZE and DEVICE2_ESIZE. ENVx_SIZE 24defines the size in bytes taken by the environment, which may be less 25then flash sector size, if the environment takes less then 1 sector. 26DEVICEx_ESIZE defines the size of the first sector in the flash 27partition where the environment resides. It is assumed that the 28environment is located in the first ENVx_SIZE bytes of the device 29DEVICEx_NAME. 30