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https://github.com/brain-hackers/u-boot-brain
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6aff3115b9
Add i2c commands to PM826 config * extend I2C POST code: check for list on known addresses
30 lines
1.2 KiB
Plaintext
30 lines
1.2 KiB
Plaintext
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This is a demo implementation of a Linux command line tool to access
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the U-Boot's environment variables.
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Configuration is done via #defines in the fw_env.h file. The
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following lines are relevant:
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#define HAVE_REDUND /* For systems with 2 env sectors */
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#define DEVICE1_NAME "/dev/mtd1"
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#define DEVICE2_NAME "/dev/mtd2"
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#define ENV1_SIZE 0x4000
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#define DEVICE1_ESIZE 0x4000
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#define ENV2_SIZE 0x4000
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#define DEVICE2_ESIZE 0x4000
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Current configuration matches the environment layout of the TRAB
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board.
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Un-define HAVE_REDUND, if you want to use the utlities on a system
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that does not have support for redundant environment enabled. The
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DEVICEx_NAME constants define which MTD character device(s) is (are)
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to be used to access the environment. If HAVE_REDUND is undefined,
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DEVICE2_NAME is ignored, as is ENV2_SIZE and DEVICE2_ESIZE. ENVx_SIZE
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defines the size in bytes taken by the environment, which may be less
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then flash sector size, if the environment takes less then 1 sector.
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DEVICEx_ESIZE defines the size of the first sector in the flash
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partition where the environment resides. It is assumed that the
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environment is located in the first ENVx_SIZE bytes of the device
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DEVICEx_NAME.
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