On Tue, Jul 05, 2016 at 10:26:45AM +0200, Maxime Ripard wrote:
The device tree overlays are a good way to deal with user-modifyable boards or boards with some kind of an expansion mechanism where we can easily plug new board in (like the BBB or the raspberry pi).
However, so far, the usual mechanism to deal with it was to have in Linux some driver detecting the expansion boards plugged in and then request these overlays using the firmware interface.
That works in most cases, but in some cases, you might want to have the overlays applied before the userspace comes in. Either because the new board requires some kind of an early initialization, or because your root filesystem is accessed through that expansion board.
The easiest solution in such a case is to simply have the component before Linux applying that overlay, removing all these drawbacks.
Reviewed-by: Stefan Agner stefan@agner.ch Acked-by: Pantelis Antoniou pantelis.antoniou@konsulko.com Acked-by: Simon Glass sjg@chromium.org Signed-off-by: Maxime Ripard maxime.ripard@free-electrons.com
Applied to u-boot/master, thanks!