Date: Fri, 28 Feb 2014 11:10:11 -0700 From: Tom Everett <tom@khubla.com> To: Ian Lepore <ian@freebsd.org> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: A unified imx6 kernel config, old WANDBOARD-* configs going away Message-ID: <CAB3ij4BLqWgdhpXgYWFcWnfwY3uC3nsiTi=Yt1PRetyAFydxsQ@mail.gmail.com> In-Reply-To: <1393594966.1149.161.camel@revolution.hippie.lan> References: <1393594966.1149.161.camel@revolution.hippie.lan>
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I'll give updating Crochet for this a spin. I'm not that familiar with DTS
however. I presume I need to drop the DTS blobs onto the FAT partition?
On Fri, Feb 28, 2014 at 6:42 AM, Ian Lepore <ian@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.
>
> I build ubldr to load at address 11000000 and let it load the kernel at
> 12000000. (The kernel can load on any 1MB boundary, but ubldr doesn't
> make use of that feature yet.) ubldr will take a dtb file loaded by
> u-boot and pass it along to the kernel. Another option is to put
> 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.
>
> 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. The "loaderdev=net" variable tells ubldr to load
> the kernel from the network device rather than disk. So now all my
> different model wandboards boot the same kernel and run from the same
> nfs root directory.
>
> -- Ian
>
>
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--
A better world shall emerge based on faith and understanding - Douglas
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