From 6aff3115b90780933d390d2b471479179927468d Mon Sep 17 00:00:00 2001 From: wdenk Date: Tue, 17 Dec 2002 01:51:00 +0000 Subject: * Use 1-byte-read instead of -write for iprobe() function Add i2c commands to PM826 config * extend I2C POST code: check for list on known addresses --- tools/env/README | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 tools/env/README (limited to 'tools/env/README') diff --git a/tools/env/README b/tools/env/README new file mode 100644 index 0000000..2b54adf --- /dev/null +++ b/tools/env/README @@ -0,0 +1,29 @@ + +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 +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 + +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. +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. -- cgit v1.1