[U-Boot] [PATCH 2/2][v2] Add readme of how to boot from espi flash for p4080ds.

[Detlev Zundel]

Hi Xie,

[...]

>> What is ACS?
>
> Don't know, I don't even have a reference to that in my copy of the RCW
> tool. :-P
>
> [Xie Shaohui] I don't know what is the ACS stands for either, but it is
> a XXD object dump file used by the tool to produce PBI, for example
> after  run "xxd u-boot.bin > u-boot.xxd", the output u-boot.xxd is the
> "XXD object dump file". If you take a look at the tool, you will find a
> selection labeled with "ACS File (XXD object dump)" in tab "PBI".