구차니의 잡동사니 모음

  This is a demo implementation of a Linux command line tool to access
 the U-Boot's environment variables.
 
 For the run-time utiltity configuration uncomment the line
 #define CONFIG_FILE  "/etc/fw_env.config"
 in fw_env.h.
 
 See comments in the fw_env.config file for definitions for the
  particular board.
 
  Configuration can also be 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 DEVICE1_OFFSET    0x0000
  #define ENV1_SIZE         0x4000
  #define DEVICE1_ESIZE     0x4000
  #define DEVICE2_OFFSET    0x0000
  #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.
  If HAVE_REDUND is undefined, DEVICE2_NAME is ignored,
  as is ENV2_SIZE and DEVICE2_ESIZE.
 
  The DEVICEx_NAME constants define which MTD character devices are to
  be used to access the environment.
 
  The DEVICEx_OFFSET constants define the environment offset within the
  MTD character device.
 
  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.