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
+In the current version, there is an issue in cross-compilation.
+In order to cross-compile fw_printenv, run
+ make HOSTCC=<your CC cross-compiler> env
+in the root directory of the U-Boot distribution. For example,
+ make HOSTCC=arm-linux-gcc env
+
+For the run-time utility configuration uncomment the line
#define CONFIG_FILE "/etc/fw_env.config"
in fw_env.h.
#define DEVICE2_ESIZE 0x4000
#define DEVICE2_ENVSECTORS 2
-Current configuration matches the environment layout of the TRAB
-board.
-
-Un-define HAVE_REDUND, if you want to use the utlities on a system
+Un-define HAVE_REDUND, if you want to use the utilities 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.
DEVICEx_ENVSECTORS defines the number of sectors that may be used for
this environment instance. On NAND this is used to limit the range
within which bad blocks are skipped, on NOR it is not used.
+
+To prevent losing changes to the environment and to prevent confusing the MTD
+drivers, a lock file at /var/lock/fw_printenv.lock is used to serialize access
+to the environment.