Hello All! I develop some "upgrade" tool based on the U-Boot booted from SD card. I want to boot from SD card, and execute some simple script which is stored in bootcmd environment variable: "echo Hello! ; mmcinit ; sleep 10 ; reset; " etc... So I need to generate some environment file. I find source from tools/env very useful (I try to get variables from correct file I already have), but I can't find any description of environment file (or flash partition) at all (which I need to write tool for generating environment file). Can someone explain me the structure of the file, please. Something like: 0-4 - CRC 5-... - (Environment)\0(Environment)\0... ... Environment End Mark... and so on.
Or tell me in what file should I see from U-Boot source.
And is there any difference between content of OneNAND flash environment-partition and file on SD card?
Thank you.