u-boot

History

wdenk d0fb80c302 * Restrict baudrate settings on LWMON to higher speeds when watchdog is on * Update baudrate in bd_info when it gets changed * Add watchdog trigger points while waiting for serial port (so far only 8xx -- needed on LWMON with 100ms watchdog) * Improve command line tool to access the U-Boot's environment (figuration of the utility, using a config file)		2003-01-11 09:48:40 +00:00
..
fw_env_main.c	* Use 1-byte-read instead of -write for iprobe() function	2002-12-17 01:51:00 +00:00
fw_env.c	* Restrict baudrate settings on LWMON to higher speeds	2003-01-11 09:48:40 +00:00
fw_env.config	* Restrict baudrate settings on LWMON to higher speeds	2003-01-11 09:48:40 +00:00
fw_env.h	* Restrict baudrate settings on LWMON to higher speeds	2003-01-11 09:48:40 +00:00
Makefile	* Use 1-byte-read instead of -write for iprobe() function	2002-12-17 01:51:00 +00:00
README	* Restrict baudrate settings on LWMON to higher speeds	2003-01-11 09:48:40 +00:00

README

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.