Importing DTS for arm64

[Marcin Wojtas]

Hi Manu,

+1 to the idea. It gives more options to the users.

pon., 20 sie 2018 o 17:12 Emmanuel Vadot <manu at bidouilliste.com> napisał(a):
>
>
>  Hello arm@
>
>  I would like to import the DTS for arm64 in the tree and use them like
> we do for the arm ones. We currently rely on the bootloader/firmware to
> give us a DTB to work with, this works nicely until it doesn't. Here is
> why I want to import the DTS :
>
>  - Most of the boards are using U-Boot, u-boot embed a DTB that isn't
> compiled with -@ (overlay ready) so we cannot use overlays. We want
> overlays, overlays are nice.
>  - The DTS life is going to linux, then sometimes it's imported in
> U-Boot but it depend on the SoC family, U-Boot doesn't batch import
> every DTS like we do. So sometimes to U-Boot DTS are very old. Or when
> an interesting patch in commited upstream it is in Linux X+2 (roughly 4
> months from now), we then have to wait for U-Boot to catch up, that
> give us between 4 and 6 months to have an update.
>  - Some boards like the Marvell ones have 3 DTS, the one in the
> vendor U-Boot made by Marvell themselves, the one in u-boot mainline
> and the one in Linux.

There is 4th - UEFI, but it's aligned with most recent Linux + some
minimal improvements (e.g. big PCIE windows).
I recommend using Macchiato with this kind of firmware instead of U-Boot.

Best regards,
Marcin

> I found that the DTS in the Marvell U-Boot have
> some problem with FreeBSD (especially the macchiatobin that declare
> node with the same address but not the same size, that is not something
> that the rman code can handle, it could be modified, I don't know the
> code well enough). Also some compatible are used when they shouldn't,
> for example they declare the gpio being orion-gpio while this binding
> requires interrupts supports, which the node doesn't have.
>  - The above situation is mostly the same with RockChip SoCs (possibly
> others, those are the only SoCs I work on that have this problem).
>
>  Note that importing the DTS doesn't mean that every board will use
> them, I don't intend to copy the DTB to the GENERIC memstick image for
> the Overdrive 1000/3000 for example, the ones provided by the firmware
> works fine.
>  RPI3 will still stay an exception as we use the DTB provided by the
> rpi-firmware package, so they come from the rpi foundation linux fork.
>
>  I would love to do that for 12 even if we are approching code freeze,
> this will allow FreeBSD 12 to be more than awesome on arm64.
>
>  Cheers,
>
> --
> Emmanuel Vadot <manu at bidouilliste.com> <manu at freebsd.org>
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