Upgraded uboot plays nicer with Bridge powered sketches

Official Hardware Classic Yún
1

With release 1.3 a patched uboot (linux side bootloader) is available. In order to upgrade it, you must follow the advanced tutorial http://arduino.cc/en/Tutorial/YunUBootReflash, because the "sysupgrade" image does not include uboot.

The patch consist in changing the sequence of chars that interrupt the linux boot process.
It required to press any char; now it requires to press the exact sequence "ard", thus making it much harder for the running Bridge powered sketch to interfere with linux.

This upgrade is for advanced users. If you're new to the Yun, take your time to become accustomed with it before experimenting with uboot.

2

Hi Federico,
thanks for your info, but can u give a link to download that uboot ?
from here http://arduino.cc/en/Tutorial/YunUBootReflash i only found version U-Boot 1.1.4-dirty (Apr 10 2014 - 15:12:15)

Thanks

3

Here is the link http://arduino.cc/download.php?f=/openwrtyun/1/YunImage_v1.5.3.zip.

This is the link you can find in the YunUbootReflash page under the "Download and unpack the image files" section. It contains the latest version of Uboot.