barebox

History

wdenk d791b1dc3e * Make sure Block Lock Bits get cleared in R360MPI flash driver * MPC823 LCD driver: Fill color map backwards, to allow for steady display when Linux takes over * Patch by Erwin Rol, 27 Feb 2003: Add support for RTEMS (this time for real). * Add support for "bmp info" and "bmp display" commands to load bitmap images; this can be used (for example in a "preboot" command) to display a splash screen very quickly after poweron. * Add support for 133 MHz clock on INCA-IP board		2003-04-20 14:04:18 +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	* Make sure Block Lock Bits get cleared in R360MPI flash driver	2003-04-20 14:04:18 +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.