Re: [PATCH v2 5/5] doc: edison: Rewrite the update instructions

[Andy Shevchenko <andriy.shevchenko@intel.com>]

On Tue, Jun 16, 2026 at 08:24:20AM -0600, Simon Glass wrote:
> Split the two ways of getting U-Boot onto the board: a plain DFU
> transfer into u-boot0 when a working U-Boot is already present, and the
> xFSTK mask ROM recovery when it is not. Drop the steps that only applied
> to replacing the original 2014 U-Boot, document the 4KB alignment gap
> the mask ROM needs and which binman output to flash (rather than the
> bare u-boot.bin), note that a bricked board enters DnX without any
> straps, and add udev rules for running the tools without sudo.

...

> -1. 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

Still missing this important detail. The DFU on v2014.04 is broken in a way
that it requires also the whole binary to be aligned by 4k. The above pads
the tail to full 4k (last block).

Btw, now I realised that I haven't checked if this is inherited in your binman
case. Note, I haven't put that into the Makefile hack as I expected users to
do this once, but perhaps if somebody wants to start over (by flashing the last
official image), the file size needs to be aligned.

-- 
With Best Regards,
Andy Shevchenko