linux-kernel - Re: [PATCH v2 0/3] arm64: dts: rockchip: minimal support for Pre-ICT tester adapter for RK3588 Jaguar + add overlay tests

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Message-ID: <Z5EY6uMmDCgfOzGO@ryzen>
Date: Wed, 22 Jan 2025 17:12:26 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Quentin Schulz <quentin.schulz@...rry.de>
Cc: Quentin Schulz <foss+kernel@...il.net>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>, Jagan Teki <jagan@...eble.ai>,
	Michael Riesch <michael.riesch@...fvision.net>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] arm64: dts: rockchip: minimal support for Pre-ICT
 tester adapter for RK3588 Jaguar + add overlay tests

On Wed, Jan 22, 2025 at 04:38:16PM +0100, Quentin Schulz wrote:
> So essentially, if SPL_ATF_NO_PLATFORM_PARAM is selected (the default for
> RK356x, RK3588, forced on on RK3308, enabled for the majority of RK3399
> boards, enabled for all RK3328 boards) the DT won't be passed to TF-A so no
> issue in terms of size on that side.
> If it is not selected, for TF-A < 2.4 (released 20201117, 4 years ago), a
> DTB bigger than 64KiB will crash TF-A.
> If it is not selected, for TF-A >= 2.4, a DTB bigger than 128KiB will result
> in TF-A not being able to read the DTB (for Rockchip, that means not being
> able to derive the UART settings (controller and baudrate) to use, and will
> use the compile-time default instead).

Not everyone is using binary blobs from Rockchip.
On my rock5b (rk3588), I'm building the bootloader using buildroot,
which is using upstream TrustedFirmware-A (v2.12).


> In short, I don't know where to go with that additional piece of
> information, but this is a bit bigger than simply moving things around and
> adding compile-time tests for overlay application.

This is significant information indeed.


Kind regards,
Niklas