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Diffstat (limited to 'tools/env/README')
| -rw-r--r-- | tools/env/README | 43 |
1 files changed, 29 insertions, 14 deletions
diff --git a/tools/env/README b/tools/env/README index 2b54adf..d8386f7 100644 --- a/tools/env/README +++ b/tools/env/README @@ -2,28 +2,43 @@ This is a demo implementation of a Linux command line tool to access the U-Boot's environment variables. -Configuration is done via #defines in the fw_env.h file. The +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 ENV1_SIZE 0x4000 -#define DEVICE1_ESIZE 0x4000 -#define ENV2_SIZE 0x4000 -#define DEVICE2_ESIZE 0x4000 +#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. The -DEVICEx_NAME constants define which MTD character device(s) is (are) -to be used to access the environment. If HAVE_REDUND is undefined, -DEVICE2_NAME is ignored, as is ENV2_SIZE and DEVICE2_ESIZE. 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. +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. It is assumed that the -environment is located in the first ENVx_SIZE bytes of the device -DEVICEx_NAME. +partition where the environment resides. |