Description

The use of board_init is inconsistent: Some boards define it in their include/board.h, some don't and rely on the caller to extern void board_init(void) it.

As a side effect, the real documentation for board_init (if there is one) is neigh impossible to find.

Proposed steps

Rip out all board_init from include/board.h files, and ask murdock whether any users of it should add an exter declaration.

In parallel, think about whether it'd make sense to have a single header that declares the function once-and-for-all, and make those that fail use that.

Open questions

• Is there any good reason to have separate board.h definitions for the function?
• If we add other per-board functions, do these apply too? (For example, some boards have external power control for things like speakers; when they follow the current board_init style, it's 50:50 where and whether they declare their functions. Example: e5c0259)