A unified imx6 kernel config, old WANDBOARD-* configs going away

[Warner Losh]

On Mar 1, 2014, at 8:42 PM, Ian Lepore <ian at FreeBSD.org> wrote:

> On Sat, 2014-03-01 at 18:01 -0700, Tom Everett wrote:
>> I'm looking at the crochet code, and I see in freebsd_install_fdt that both
>> *.dtb and *.dts are supported. However on the source tree it's imx6.dtsi.
>> What's the difference b/t a dts file and a dtsi file?
> 
> A .dtsi file is an include file used by .dts files.  A .dtb is the
> binary (compiled) form used by the kernel.
> 
> So there are several wandboard-something.dts files, each of which
> includes imx6.dtsi where all the common parts live.  For a new imx6
> device, a new board-named file similar to one of the wandboard files is
> necessary, and it would also include imx6.dtsi.

As would other boards that use the imx6 SoC. They’d have their own .dts
file that included the imx6.dsti and customized it for how they are wired
together.

> We're pushing hard towards just using the standard dtb files from
> vendors, but we've got a bit of work to do before we're there.

I have some rough changes that allow us to build N different DTBs as part
of the kernel build, but not glom them into the kernel. Not strictly required
for this, but helpful.

I’m planning on having Atmel use 100% vendor supplied files as well.
It is a very good goal. There’s also efforts on the linux side to separate out
the device-trees from the linux kernel, which is where I grabbed the recent
/vendor/device-tree stuff from.

Warner