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

[Warner Losh]

On Feb 28, 2014, at 11:10 AM, Tom Everett <tom at khubla.com> wrote:

> 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?

Yes. For now, this will be a manual step for the moment, but will be automated
soonish. I’m working on overhauling the dts stuff we have in the system right
now and will commit something for that shortly after I finish… I expect full
Crochet integration to follow after that.

Warner

> On Fri, Feb 28, 2014 at 6:42 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.
>> 
>> 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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> 
> 
> 
> -- 
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