README.md: document keyboard controller

Add a paragraph about identifying the SH68F83 keyboard controller IC.
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Pierre Labadens 2021-09-04 14:45:14 +02:00
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@ -119,6 +119,11 @@ Note that the default U-Boot build does not do anything with LED on startup.
>
> It is unclear how to identify said hardware from a running system.
To determine which keyboard controller you have, you will need to disassemble
the Pinebook Pro as per [the Pine64
wiki](https://wiki.pine64.org/wiki/Pinebook_Pro#Keyboard), and make sure that
the IC next to the U23 marking on the main board is an **SH68F83**.
```
$ nix-build -A pkgs.pinebookpro-keyboard-updater
$ sudo ./result/bin/updater step-1 <iso|ansi>