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barebox/tools/env
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Marian Balakowicz f93286397e Add support for a saving build objects in a separate directory. 
Modifications are based on the linux kernel approach and
support two use cases:

  1) Add O= to the make command line
  'make O=/tmp/build all'

  2) Set environement variable BUILD_DIR to point to the desired location
  'export BUILD_DIR=/tmp/build'
  'make'

The second approach can also be used with a MAKEALL script
'export BUILD_DIR=/tmp/build'
'./MAKEALL'

Command line 'O=' setting overrides BUILD_DIR environent variable.

When none of the above methods is used the local build is performed and
the object files are placed in the source directory.
 		2006-09-01 19:49:50 +02:00
..
Makefile Add support for a saving build objects in a separate directory. 2006-09-01 19:49:50 +02:00
README * Restrict baudrate settings on LWMON to higher speeds 2003-01-11 09:48:40 +00:00
fw_env.c Fix array overflow with fw_setenv on uninitialised environment 2006-03-12 23:27:46 +01:00
fw_env.config * Restrict baudrate settings on LWMON to higher speeds 2003-01-11 09:48:40 +00:00
fw_env.h Change all '$(...)' variable references into '${...}' 2005-11-20 21:40:11 +01:00
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.