On 18/05/2018 17:45, Mark Brown wrote:

On Fri, May 18, 2018 at 05:28:10PM +0100, Grant Likely wrote:

...

+Devicetree tables at the same time. Platforms that want to offer +both ACPI and Devicetree solutions must implement a boot time +mechanism to select one or the other, before the OS Loader is +executed.

How about "...must configure this using a mechanism that ensures that one or the other is chosen and provided to the OS loader when it is executed"? It doesn't really matter for sensible systems but I can see someone misreading the above and thinking there must be a prompt on boot or something, I do think this is me being paranoid about perverse implementors though.

My bikeshed now has a sign that reads:

+As stated above, EBBR systems must not provide both ACPI +and Devicetree tables at the same time. +Systems that support both interfaces must provide a configuration +mechanism to select either ACPI or Devicetree, +and must ensure only the selected interface is provided +to the OS loader.

g.