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

[Tom Everett]

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?



On Sat, Mar 1, 2014 at 8:41 AM, Tim Kientzle <tim at kientzle.com> wrote:

>
> On Feb 28, 2014, at 5:42 AM, Ian Lepore <ian at freebsd.org> wrote:
>
> > I've added a new imx6 unified kernel config named IMX6.  It has no
> > compiled-in fdt, and can boot all three flavors of Wandboard when u-boot
> > and ubldr load a dtb file.  Folks should start using it and eventually
> > the WANDBOARD* configs will go away when nobody needs them anymore.
>
> Nice!  Another step towards GENERIC ARM.
>
> > the .dtb file in your /boot/kernel or /boot/modules directory, and ubldr
> > will load it from there, using the filename set in the u-boot env var
> > fdt_file.
>
> Using a U-Boot env var to specify the FDT is a nice idea.
>
> > Unfortunately we can't do a single image that boots any wandboard,
> > because u-boot itself has to be different for each board.  This is what
> > my u-boot env looks like on each wandboard:
> >
> > => printenv
> > baudrate=115200
> > bootcmd=run ubnet
> > bootdelay=1
> > console=ttymxc0
> > fdt_file=wandboard-dual.dtb
> > loadaddr=11000000
> > loaderdev=net
> > ubmmc=fatload mmc 0 ${loadaddr} ubldr; bootelf
> > ubnet=dhcp ${loadaddr} /wand/boot/ubldr;bootelf
> >
> > Environment size: 265/8188 bytes
> >
> > The only thing that differs per-board is the fdt_file setting, and the
> > u-boot binary itself.
>
> If you could get to a single U-Boot binary, you might
> be able to do what BeagleBone does:  The U-boot.env
> script detects the board variation and conditionally
> loads the correct DTB blob.
>
> Tim
>
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