barebox

History

wdenk 4a6fd34b26 * Patch by Lutz Dennig, 10 Apr 2003: Update for R360MPI board * Add new meaning to "autostart" environment variable: If set to "no", a standalone image passed to the "bootm" command will be copied to the load address (and eventually uncompressed), but NOT be started. This can be used to load and uncompress arbitrary data. * Set max brightness for MN11236 displays on TRAB board		2003-04-12 23:38:12 +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
fw_env.c	* Patch by Lutz Dennig, 10 Apr 2003:	2003-04-12 23:38:12 +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
fw_env_main.c	* Patch by Josef Wagner, 12 Mar 2003:	2003-03-12 10:41:04 +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.