1*6aff3115Swdenk 2*6aff3115SwdenkThis is a demo implementation of a Linux command line tool to access 3*6aff3115Swdenkthe U-Boot's environment variables. 4*6aff3115Swdenk 5*6aff3115SwdenkConfiguration is done via #defines in the fw_env.h file. The 6*6aff3115Swdenkfollowing lines are relevant: 7*6aff3115Swdenk 8*6aff3115Swdenk#define HAVE_REDUND /* For systems with 2 env sectors */ 9*6aff3115Swdenk#define DEVICE1_NAME "/dev/mtd1" 10*6aff3115Swdenk#define DEVICE2_NAME "/dev/mtd2" 11*6aff3115Swdenk#define ENV1_SIZE 0x4000 12*6aff3115Swdenk#define DEVICE1_ESIZE 0x4000 13*6aff3115Swdenk#define ENV2_SIZE 0x4000 14*6aff3115Swdenk#define DEVICE2_ESIZE 0x4000 15*6aff3115Swdenk 16*6aff3115SwdenkCurrent configuration matches the environment layout of the TRAB 17*6aff3115Swdenkboard. 18*6aff3115Swdenk 19*6aff3115SwdenkUn-define HAVE_REDUND, if you want to use the utlities on a system 20*6aff3115Swdenkthat does not have support for redundant environment enabled. The 21*6aff3115SwdenkDEVICEx_NAME constants define which MTD character device(s) is (are) 22*6aff3115Swdenkto be used to access the environment. If HAVE_REDUND is undefined, 23*6aff3115SwdenkDEVICE2_NAME is ignored, as is ENV2_SIZE and DEVICE2_ESIZE. ENVx_SIZE 24*6aff3115Swdenkdefines the size in bytes taken by the environment, which may be less 25*6aff3115Swdenkthen flash sector size, if the environment takes less then 1 sector. 26*6aff3115SwdenkDEVICEx_ESIZE defines the size of the first sector in the flash 27*6aff3115Swdenkpartition where the environment resides. It is assumed that the 28*6aff3115Swdenkenvironment is located in the first ENVx_SIZE bytes of the device 29*6aff3115SwdenkDEVICEx_NAME. 30