On 06/10/2016 10:47, David Gibson wrote:
On Fri, Sep 30, 2016 at 03:57:13PM +0200, Maxime Ripard wrote:
Hi,
The device tree overlays are a great solution to the issue raised by
the bunch expandable boards we find everywhere these days, like the
Beaglebone, Raspberry Pi or CHIP.
Although for now Linux is the only available tool that can deal with
overlays, some other components like bootloaders or user-space tools
might need to apply these overlays on top of a base device tree.
To address these use cases, we introduce a new function to the libfdt,
fdt_overlay_apply, that does just that.
You can find a test program here: http://code.bulix.org/792zum-99476?raw
This is the last patches sent to U-boot, with the modifications
suggested by David, and the additional test cases.
Let me know what you think!
Maxime
Looking pretty good. There's a minor error in 3/4 which I've pointed
out, it can be fixed in a followup.
An error in the conditionals means it's trying to run some of the
tests which require an overlay-aware dtc on even when that's not
available - I adjusted 4/4 to correct that.
It also hit build failures on Travis, because the compiler version
there complains about local variables named 'index' shadowing the
standard library function. I've corrected that with a followup patch.
With that done, the whole lot has been committed to master.
Now that upstream libfdt can resolve and apply overlays we need a way
of generating them. I have a set of three patches from Pantelis that
add "plugin" support to dtc, together with two downstream (Raspberry Pi)
patches that fix an uninitialised memory reference and restrict
__local_fixups__ generation to overlays.
Is there already a plan to get the enhanced dtc upstreamed? If so, can I
get the downstream fixes included?
Phil Elwell
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