u-boot中setexpr命令的使用

点滴 admin 11年前 (2013-12-09) 3363次浏览已收录扫描二维码

CONFIG_CMD_SETEXPR被include/config_cmd_all.h包含，所以在板子相关的配置文件中加上#define CONFIG_CMD_SETEXPR, setexpr命令就会被加入进来

1. setexpr命令帮助信息

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setexpr – set environment variable as the result of eval expression

Usage:
setexpr [.b, .w, .l] name value1 op value2
– set environment variable ’name’ to the result of the evaluated
express specified by op. op can be , |, ^, +, -, *, /, %
size argument is only meaningful if value1 and/or value2 are memory addresses

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2. setexpr使用方法

3. FAQ