From: Michael Walle <michael@walle.cc>
To: ilias.apalodimas@linaro.org
Cc: liviu.dudau@foss.arm.com, narmstrong@baylibre.com,
rick@andestech.com, vladimir.oltean@nxp.com,
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Subject: Re: [PATCH 00/16] fdt: Make OF_BOARD a boolean option
Date: Tue, 2 Nov 2021 11:06:59 +0100 [thread overview]
Message-ID: <20211102100659.2397019-1-michael@walle.cc> (raw)
In-Reply-To: <CAC_iWjLDieo9d9uOVGpxEqEMYn+O=GEzdMwPEYmT2kswMVPi_g@mail.gmail.com>
Hi,
> On Thu, 28 Oct 2021 at 05:51, Simon Glass <sjg@chromium.org> wrote:
> > On Tue, 26 Oct 2021 at 00:46, Ilias Apalodimas
> > <ilias.apalodimas@linaro.org> wrote:
..
> > Linux actually doesn't care if the U-Boot properties are in the tree,
> > so long as we have proper bindings. My point here is we only need
> > either:
> >
> > a. one devicetree, shared with Linux and U-Boot (and TF-A?)
> > b. two devicetrees, one for use in firmware and one for passing to Linux
> >
> > We don't need to separate out the U-Boot properties into a second (or
> > third) devicetree. There just isn't any point.
>
> Again if we are talking about bindings that are upstream in the spec,
> then we agree. Depending on the SRAM limitation we can even do (a).
> If the vendor messes up the DT backwards compatibility then we can do
> (b). If you expect TF-A and FIP to go pick up the special bindings
> U-Boot needs, then we disagree.
*puts developer at board vendor hat on* Sometimes (personally I'd say
usually) it isn't possible to have a backwards compatible tree. Also,
like it or not, in the device tree there *are* configuration options
which are not hardware dependent (eg. internal ethernet connection on
the ls1028a). So a vendor doesn't necessarily need to "mess things up"
to need (b). And as you know, my point is, that this device tree has
to come from the distribution, it must not be compiled in into the
firmware.
I feel like I've repeated this far too many times. Therefore, this
will be my last comment about it and I would really like to see that
this - very real - scenario is treated as a valid use case and will be
supported in your systemready vision.
-michael
next prev parent reply other threads:[~2021-11-02 10:08 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 1:01 [PATCH 00/16] fdt: Make OF_BOARD a boolean option Simon Glass
2021-10-13 1:01 ` [PATCH 01/16] arm: qemu: Mention -nographic in the docs Simon Glass
2021-10-13 1:01 ` [PATCH 02/16] arm: qemu: Explain how to extract the generate devicetree Simon Glass
2021-10-13 1:19 ` François Ozog
2021-10-13 16:58 ` Simon Glass
2021-10-13 17:36 ` Tom Rini
2021-10-13 1:01 ` [PATCH 03/16] riscv: " Simon Glass
2021-10-13 1:01 ` [PATCH 04/16] arm: qemu: Add a devicetree file for qemu_arm Simon Glass
2021-10-13 1:01 ` [PATCH 05/16] arm: qemu: Add a devicetree file for qemu_arm64 Simon Glass
2021-10-13 1:15 ` François Ozog
2021-10-27 14:44 ` Alex Bennée
2021-10-27 14:56 ` Tom Rini
2021-10-27 18:34 ` Simon Glass
2021-10-27 18:39 ` Tom Rini
2021-10-27 19:45 ` Alex Bennée
2021-10-13 1:01 ` [PATCH 06/16] riscv: qemu: Add devicetree files for qemu_riscv32/64 Simon Glass
2021-10-13 4:21 ` Heinrich Schuchardt
2021-10-13 1:29 ` [PATCH 00/16] fdt: Make OF_BOARD a boolean option Bin Meng
2021-10-13 1:34 ` Tom Rini
2021-10-13 8:02 ` François Ozog
2021-10-13 14:47 ` Simon Glass
2021-10-13 17:34 ` François Ozog
2021-10-13 18:06 ` Simon Glass
2021-10-14 14:56 ` Tom Rini
2021-10-14 15:17 ` Simon Glass
2021-10-14 15:28 ` Tom Rini
2021-10-14 17:58 ` François Ozog
2021-10-15 18:03 ` Simon Glass
2021-10-26 6:46 ` Ilias Apalodimas
2021-10-27 12:59 ` Tom Rini
2021-10-27 13:30 ` François Ozog
2021-10-27 13:38 ` Tom Rini
2021-10-27 13:47 ` Ilias Apalodimas
2021-10-27 14:26 ` Tom Rini
2021-10-27 13:48 ` François Ozog
2021-10-27 14:30 ` Tom Rini
2021-10-28 2:50 ` Simon Glass
2021-10-28 8:21 ` François Ozog
2021-10-28 14:30 ` Simon Glass
2021-10-28 14:50 ` François Ozog
2021-10-28 15:44 ` Simon Glass
2021-10-28 16:25 ` François Ozog
2021-11-02 14:59 ` Simon Glass
2021-11-01 11:04 ` Ilias Apalodimas
2021-11-02 10:06 ` Michael Walle [this message]
2021-11-02 12:34 ` François Ozog
2021-11-02 14:59 ` Simon Glass
2021-10-27 12:48 ` Tom Rini
2021-10-27 13:15 ` François Ozog
2021-10-27 13:23 ` Heinrich Schuchardt
2021-10-27 14:55 ` Tom Rini
2021-10-27 15:02 ` Heinrich Schuchardt
2021-10-27 18:04 ` Tom Rini
2021-10-27 14:54 ` Tom Rini
2021-10-27 15:10 ` Mark Kettenis
2021-10-27 15:24 ` Simon Glass
2021-10-27 18:06 ` Tom Rini
2021-10-27 18:11 ` François Ozog
2021-10-27 21:52 ` Mark Kettenis
2021-10-27 16:02 ` François Ozog
2021-10-27 19:06 ` Tom Rini
2021-10-27 22:00 ` François Ozog
2021-10-28 14:41 ` Tom Rini
2021-10-14 16:24 ` Andre Przywara
2021-10-14 17:48 ` François Ozog
2021-10-14 18:12 ` François Ozog
2021-10-14 21:00 ` Simon Glass
2021-10-13 12:39 ` Philippe Mathieu-Daudé
2021-10-13 13:06 ` François Ozog
2021-10-13 4:26 ` Heinrich Schuchardt
2021-10-13 13:06 ` François Ozog
2021-10-13 9:50 ` Andre Przywara
2021-10-13 13:05 ` François Ozog
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