[PATCH 2/2] arm64: dts: qcom: Rename SBC to DragonBoard 410c

[Rob Clark]

On Wed, Oct 4, 2017 at 6:09 PM, Stephen Boyd <sboyd at codeaurora.org> wrote:
> On 10/04, Rob Clark wrote:
>> On Tue, Oct 3, 2017 at 2:54 PM, Rob Clark <robdclark at gmail.com> wrote:
>> > On Tue, Oct 3, 2017 at 1:49 PM, Nicolas Dechesne
>> > <nicolas.dechesne at linaro.org> wrote:
>> >> On Tue, Oct 3, 2017 at 6:37 PM, Rob Clark <robdclark at gmail.com> wrote:
>> >>> On Tue, Oct 3, 2017 at 8:25 AM, Srinivas Kandagatla
>> >>> <srinivas.kandagatla at linaro.org> wrote:
>> >>>>
>> >>>>
>> >>>> On 03/10/17 10:11, Linus Walleij wrote:
>> >>>>>
>> >>>>> Naming the DragonBoard 410c "SBC" (I guess "single board computer")
>> >>>>> is not very helpful for users looking for their device tree in
>> >>>>> the kernel. Also the db820c is named properly.
>> >>>>>
>> >>>>> Rectify this, simply, do not change the compatible strings but name
>> >>>>> the DTS files in a consistent manner.
>> >>>>>
>> >>>>> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
>> >>>>
>> >>>> I did not like the sbc naming convention too, This was primarily done due to
>> >>>> some legacy build tools + bootloaders which have used sbc compatible to
>> >>>> identify boards from multiple dtb blobs. Now that we can append dtb to
>> >>>> kernel with new LK, this should not be a issue anymore.
>> >>>
>> >>> maybe it would be an idea to update skales/dbttool first to look for
>> >>> the new name, and then give people some time to upgrade, before
>> >>> changing this in the kernel.  Otherwise I expect you'll cause some
>> >>> confusion..
>> >>
>> >> iirc, skale is using the compatible name, not the filename.
>> >>
>> >
>> > ahh, yes, I think you are right.. u-boot is using a different filename.
>> >
>> > So in this case, no issue to pick a saner name :-)
>> >
>>
>> So, actually u-boot encodes the board's fdtname..  so as much as I'd
>> like to rename it to something more sane, unless the kernel can manage
>> to install a symlink for backwards compat, NAK
>>
>> I was trying to think of hacks for u-boot to check for multiple fdt
>> names, but if we want to get to the point of being able to install
>> multiple distro's on a single disk, we actually need to pass fdtname
>> to grub (where distro specific grub.cfg is encoding the UUID of the
>> distro's /boot partition, so it knows where to load the dtb from)..
>> this gets nearly impossible when one name becomes multiple names.  So
>> hurray for the fdt name becoming accidental ABI!
>>
>> If we managed to get this in before the 4.14 LTS I might feel
>> differently.  But afterwards, totally not. :-(
>>
>
> How do you install dtbs onto your device? Should be simple enough
> to run 'mv' on the new filename to the old one?
>

it is part of the kernel package.. but fixing it in the distro means
fixing it in *every* distro..

if we are going for a workaround, then it should be the kernel
installing a symlink.  Not every distro having to fix things up in the
same way for one particular board.

BR,
-R