45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
|
|
||
|
|
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.
|