Hi all, I've perused all u-boot documentation I could find, but nowhere I found an answer to my (I think) fairly simple question:
Given a bootable SD card, how can I change u-boot's behavior to, for example, load a different kernel image or use different environment variables (I'm most desperate to set the device to have a fixed MAC address)? I think the environment variables need to be written to a specific location on the SD card, but u-boot-tools provides no such tool. man fw_setenv needs a file /etc/env.config, but my system (which is a finished image I copied from somewhere) doesn't have that. So, how is it done? Below is a listing of the /boot partition of my SD card. My system, as it is, boots the 3.8 kernel. This begs some additional questions: - Why is there a 3.10 System.map and not a 3.8 one? Is this file even needed? - What's the difference between uImage and zImage, and why does one kernel version have a uImage and the other a zImage? - Is the "dts" file the source that the "dtb" file was created from, or does it have some other purpose? Thanks, robert root@odroid:/boot# ls -l total 19876 -rw-r--r-- 1 root root 113039 Apr 25 2015 config-3.10.75-84 -rw-r--r-- 1 root root 102534 Mar 4 2015 config-3.8.13.30 -rw-r--r-- 1 root root 4216745 Dec 20 19:33 initrd.img-3.10.75-84 -rw-r--r-- 1 root root 18358 Apr 25 2015 meson8b_odroidc.dtb -rw-r--r-- 1 root root 36941 Apr 25 2015 meson8b_odroidc.dts -rw-r--r-- 1 root root 1910532 Apr 25 2015 System.map-3.10.75-84 -rw-r--r-- 1 root root 5468767 Apr 25 2015 uImage-3.10.75-84 -rw-r--r-- 1 root root 3949837 May 4 2015 uInitrd-3.10.75-84 -rw-r--r-- 1 root root 2157425 May 3 2015 uInitrd-3.8.13.30 -rw-r--r-- 1 root root 2352088 May 4 2015 zImage-3.8.13.30 root@odroid:/boot#
