mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-03 18:10:13 +00:00
566e5cf451
The 'trab' board configuration is broken, and there is nobody who is interested and willing to fix it. Drop it. This includes support for VFD displays which have always been used by this board only. Signed-off-by: Wolfgang Denk <wd@denx.de>
57 lines
2 KiB
Text
57 lines
2 KiB
Text
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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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In the current version, there is an issue in cross-compilation.
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In order to cross-compile fw_printenv, run
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make HOSTCC=<your CC cross-compiler> env
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in the root directory of the U-Boot distribution. For example,
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make HOSTCC=arm-linux-gcc env
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For the run-time utiltity configuration uncomment the line
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#define CONFIG_FILE "/etc/fw_env.config"
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in fw_env.h.
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For building against older versions of the MTD headers (meaning before
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v2.6.8-rc1) it is required to pass the argument "MTD_VERSION=old" to
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make.
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See comments in the fw_env.config file for definitions for the
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particular board.
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Configuration can also be 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 DEVICE1_OFFSET 0x0000
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#define ENV1_SIZE 0x4000
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#define DEVICE1_ESIZE 0x4000
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#define DEVICE1_ENVSECTORS 2
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#define DEVICE2_OFFSET 0x0000
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#define ENV2_SIZE 0x4000
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#define DEVICE2_ESIZE 0x4000
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#define DEVICE2_ENVSECTORS 2
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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.
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If HAVE_REDUND is undefined, DEVICE2_NAME is ignored,
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as is ENV2_SIZE and DEVICE2_ESIZE.
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The DEVICEx_NAME constants define which MTD character devices are to
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be used to access the environment.
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The DEVICEx_OFFSET constants define the environment offset within the
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MTD character device.
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ENVx_SIZE defines the size in bytes taken by the environment, which
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may be less then flash sector size, if the environment takes less
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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.
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DEVICEx_ENVSECTORS defines the number of sectors that may be used for
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this environment instance. On NAND this is used to limit the range
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within which bad blocks are skipped, on NOR it is not used.
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