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From: Qu Wenruo <quwenruo.btrfs@gmx.com>
To: systemd-devel@lists.freedesktop.org,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Systemd-boot not properly loading device tree, when loaded by U-boot (ARM64, tested on RK3399)
Date: Fri, 17 Sep 2021 18:45:06 +0800	[thread overview]
Message-ID: <c83cf1a8-835e-7256-2c0d-dc131bcc1dbb@gmx.com> (raw)

Hi,

I'm recently testing booting my RK3399 boards with the following boot
sequence:

U-boot -> systemd-boot (EFI payload) -> kernel

Which provides much more flex than plain extlinux conf from U-boot.
(More choice, easier to write config, runtime kernel change).

So far "kernel" and "initramfs" key work fine.

But I notice that "devicetree" key is not working properly.

The Uboot fdt search path doesn't include "/dtbs" which is used by my
distro, and my entry config specify the device-tree file like this:

title		ManjaroARM boot from nvme
linux		/Image
devicetree	/dtbs/rockchip/rk3399-rockpro64.dtb
initrd		/initramfs-linux.img
options		console=ttyS2,1500000 root=/dev/arm_nvme/root rw loglevel=7

Thus if systemd-boot doesn't load the correct device-tree, kernel will
use the default fdt passed from Uboot, which is already out-of-date and
can cause problems for the upstream kernel I used.

Unfortunately, with above config, after booting the kernel, the fdt is
the fallback one from Uboot, not loading the proper one specified by
systemd-boot config.

The proof I went is checking the opp table.
I have replaced the "/dtbs/rockchip/rk3399-rockpro64.dtb" with a custom
dtb which uses op1 tables.
But the kernel only sees a very out-of-dated fdt, which some opp is even
invalid.

How could I continue debugging the missing link?
Like what systemd-boot needs to load the device-tree? Or U-boot EFI
environment lacks certain facility to support systemd-boot?

Thanks,
Qu

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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2021-09-17 10:47 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17 10:45 Qu Wenruo [this message]
2021-09-17 11:25 Systemd-boot not properly loading device tree, when loaded by U-boot (ARM64, tested on RK3399) Qu Wenruo
2021-09-17 11:25 ` Qu Wenruo

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