fw_env - simply read a variable from U-Boot Env block

What it is

fw_env is a simple pure Rust implementation of fw_printenv from the U-Boot bootloader tools. Basic usage: rust let config = Config::init()?; let env = FwEnv::read(&config)?; let uboot_version = env.find_var(b"ver"[..]).expect("variable not found");

TODO

• [X] check CRC
• [X] find variable by name
• [ ] full config file (/etc/fw_env.config) parsing
• [ ] handle bad blocks in flash
• [ ] handle flags in redundant blocks