Date: Sun, 2 Mar 2014 18:50:59 -0700 From: Tom Everett <tom@khubla.com> To: Ian Lepore <ian@freebsd.org> Cc: Tim Kientzle <tim@kientzle.com>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: A unified imx6 kernel config, old WANDBOARD-* configs going away Message-ID: <CAB3ij4CRW5E=7ozNQp6Ldr2jphrhJjRabzXseFgYSXjnx8ZsHA@mail.gmail.com> In-Reply-To: <1393778472.1149.242.camel@revolution.hippie.lan> References: <1393594966.1149.161.camel@revolution.hippie.lan> <F38D0A2F-D2AF-426D-8515-BD111501B2A2@kientzle.com> <CAB3ij4Dd1jq-_v7LVZ75skA3tZVOb=03vJ5JkSCb-7FL8FMrLg@mail.gmail.com> <1393731762.1149.233.camel@revolution.hippie.lan> <9BF14340-2267-473E-B047-E377AA258713@bsdimp.com> <1393778472.1149.242.camel@revolution.hippie.lan>
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I've got my wandboard quad booting now, with wandboard-quad.dtb in /boot/kernel/. I've submitted a patch to crochet-freebsd and the latest build is up at my FTP. Ian, your patch to ubldr appears to work perfectly. On Sun, Mar 2, 2014 at 9:41 AM, Ian Lepore <ian@freebsd.org> wrote: > On Sun, 2014-03-02 at 09:30 -0700, Warner Losh wrote: > > On Mar 1, 2014, at 8:42 PM, Ian Lepore <ian@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 > > For imx6, the big obstacle to using vendor dtb files is now just the > device instantiation order. The stock dts files list devices basically > in order of their memory-mapped register addresses, but we need the > interrupt controller to be available first regardless of where it's > mapped, and likewise for a few other critical devices. > > I need to do another round of experimentation with the > EARLY_DRIVER_MODULE() stuff and multipass device instantiation. We may > not be all that far from success. > > -- Ian > > > _______________________________________________ > freebsd-arm@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" > -- A better world shall emerge based on faith and understanding - Douglas MacArthur
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