Edison¶

Build Instructions for U-Boot as main bootloader¶

Simple you can build U-Boot and obtain u-boot.bin:

$ make edison_defconfig
$ make all

By default Intel Edison boards are shipped with preinstalled heavily patched U-Boot v2014.04. Though it supports DFU which we may be able to use.

Prepare u-boot.bin as described in chapter above. You still need one more step (if and only if you have original U-Boot), i.e. run the following command:
```
$ truncate -s %4096 u-boot.bin
```
Run your board and interrupt booting to U-Boot console. In the console call:
```
=> run do_force_flash_os
```
Wait for few seconds, it will prepare environment variable and runs DFU. Run DFU command from the host system:
```
$ dfu-util -v -d 8087:0a99 --alt u-boot0 -D u-boot.bin
```
Return to U-Boot console and following hint. i.e. push Ctrl+C, and reset the board:
```
=> reset
```