On Thu, Aug 14, 2014 at 01:50:31PM -0600, Stephen Warren wrote: [snip] > uenv.txt is the opposite; it's very U-Boot specific, and more about > internal implementation details of U-Boot. In particular, I only see > a use-case for uenv.txt on systems that have nowhere to store the > U-Boot environment other than in some filesystem. That's the reason > the RPi port loads uenv.txt, so the environment can be modified > somehow. Perhaps there's an ENV_IS_IN_FAT that could be used instead > on the Pi? For example, none of the Tegra boards use uEnv.txt since > "saveenv" to flash works there.
Even with ENV_IS_IN_FAT you need to be in U-Boot to modify the environment (fw_setenv/printenv should be adaptable easily enough I would hope, but aren't today). uEnv.txt is the way for a user to pop the SD card into their PC, tweak the env as needed (or fiddle some bits), eject the card and boot their target. -- Tom
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