u-boot/tools/env
Detlev Zundel 0aef7bc719 tools/env/fw_printenv: Make redundant env work on locked flashes also
The invalidation of the old environment instance did not work for flashes
supporting hardware locking.  Now we unlock/lock around this update also.

Signed-off-by: Detlev Zundel <dzu@denx.de>
2010-08-09 01:05:37 +02:00
..
fw_env.c tools/env/fw_printenv: Make redundant env work on locked flashes also 2010-08-09 01:05:37 +02:00
fw_env.config Fix a typo in fw_env.config 2008-12-15 21:49:03 +01:00
fw_env.h Tools: set multiple variable with fw_setenv utility 2010-06-29 22:43:27 +02:00
fw_env_main.c Tools: set multiple variable with fw_setenv utility 2010-06-29 22:43:27 +02:00
Makefile Rename lib_generic/ to lib/ 2010-04-13 09:13:04 +02:00
README fw_env: add NAND support 2008-09-09 10:39:55 +02:00

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.

For building against older versions of the MTD headers (meaning before
v2.6.8-rc1) it is required to pass the argument "MTD_VERSION=old" to
make.

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 DEVICE1_ENVSECTORS     2
#define DEVICE2_OFFSET    0x0000
#define ENV2_SIZE         0x4000
#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
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.

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.