From: Viresh Kumar <viresh.kumar@linaro.org>
To: Frank Rowand <frowand.list@gmail.com>
Cc: David Gibson <david@gibson.dropbear.id.au>,
Rob Herring <robh+dt@kernel.org>,
Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Masahiro Yamada <masahiroy@kernel.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Bill Mills <bill.mills@linaro.org>,
anmar.oueja@linaro.org
Subject: Re: [PATCH V5 5/5] of: unittest: Statically apply overlays using fdtoverlay
Date: Thu, 21 Jan 2021 11:04:26 +0530 [thread overview]
Message-ID: <20210121053426.4dw5oqz7qb4y7hvm@vireshk-i7> (raw)
In-Reply-To: <7d6adfd9-da1e-d4ca-3a04-b192f0cf36b0@gmail.com>
On 20-01-21, 23:14, Frank Rowand wrote:
> It is a convenient FDT to use because it provides the frame that the overlays
> require to be applied. It is fortunate that fdtoverlay does not reject the use
> of an FDT with overlay metadata as the base blob.
> This is probably a good idea instead of depending on the leniency of fdtoverlay.
I believe fdtoverlay allows that intentionally, that would be required
for the cases where we have a hierarchy of extension boards or
overlays.
A platform can have a base dtb (with /plugin/;), then we can have an
overlay (1) for an extension board (with /plugin/;) and then an
overlay (2) for an extension board for the previous extension board.
In such a case overlay-(2) can't be applied directly to the base dtb
as it may not find all the nodes it is trying to update. And so
overlay-(2) needs to be applied to overlay-(1) and then the output of
this can be applied to the base dtb.
This is very similar to what I tried with the intermediate.dtb
earlier.
--
viresh
next prev parent reply other threads:[~2021-01-21 5:42 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 7:06 [PATCH V5 0/5] dt: build overlays Viresh Kumar
2021-01-20 7:06 ` [PATCH V5 1/5] scripts: dtc: Fetch fdtoverlay.c from external DTC project Viresh Kumar
2021-01-20 7:06 ` [PATCH V5 2/5] scripts: dtc: Build fdtoverlay tool Viresh Kumar
2021-01-20 7:06 ` [PATCH V5 3/5] scripts: dtc: Remove the unused fdtdump.c file Viresh Kumar
2021-01-21 0:44 ` David Gibson
2021-01-21 4:17 ` Viresh Kumar
2021-01-21 6:26 ` David Gibson
2021-01-21 14:18 ` Rob Herring
2021-01-20 7:06 ` [PATCH V5 4/5] kbuild: Add support to build overlays (%.dtbo) Viresh Kumar
2021-01-20 8:58 ` Masahiro Yamada
2021-01-20 9:55 ` Viresh Kumar
2021-01-20 11:04 ` Masahiro Yamada
2021-01-20 11:27 ` Viresh Kumar
2021-01-21 0:49 ` David Gibson
2021-01-21 4:13 ` Viresh Kumar
2021-01-21 5:40 ` Frank Rowand
2021-01-21 6:25 ` David Gibson
2021-01-20 7:06 ` [PATCH V5 5/5] of: unittest: Statically apply overlays using fdtoverlay Viresh Kumar
2021-01-21 0:51 ` David Gibson
2021-01-21 5:14 ` Frank Rowand
2021-01-21 5:34 ` Viresh Kumar [this message]
2021-01-21 5:45 ` Frank Rowand
2021-01-21 5:50 ` Viresh Kumar
2021-01-21 6:36 ` David Gibson
2021-01-21 6:34 ` David Gibson
2021-01-21 6:57 ` Viresh Kumar
2021-01-21 23:39 ` David Gibson
2021-01-22 3:10 ` Viresh Kumar
2021-01-22 4:27 ` David Gibson
2021-01-21 5:34 ` Frank Rowand
2021-01-21 5:43 ` Viresh Kumar
2021-01-21 5:55 ` Frank Rowand
2021-01-21 5:58 ` Viresh Kumar
2021-01-21 7:04 ` Frank Rowand
2021-01-21 23:41 ` David Gibson
2021-01-21 6:37 ` David Gibson
2021-01-20 15:43 ` [PATCH V5 0/5] dt: build overlays Rob Herring
2021-01-21 4:14 ` Viresh Kumar
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