aarch64 pkgbase example: "devmatch: Can't read linker hints file."

Reply: Mark Millard : "Re: aarch64 pkgbase example: "devmatch: Can't read linker hints file." [operator error, sorry]"
In reply to: Mark Millard : "Having multiple (pkgbase) kernels vs. /etc/rc* related activities at boot: does not respect kernel= or kern.module_path= from loader.conf"
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From: Mark Millard <marklmi_at_yahoo.com>
Date: Wed, 21 Feb 2024 04:26:38 UTC

devd's devmatch has issues. Here the example is aarch64 (for
which pkgbase has /boot/dtb/ split out and, so, allows
multiple kernels to be installed at once). 

# grep '^kern.*="kernel' /boot/loader.conf
kernel="kernel.GENERIC-NODEBUG"
kern.module_path="kernel.GENERIC-NODEBUG"

# uname -apKU
FreeBSD aarch64-main-pkgs 15.0-CURRENT FreeBSD 15.0-CURRENT main-n268410-445d3d227e68 GENERIC-NODEBUG arm64 aarch64 1500014 1500014

# ls -Tlodt /boot/kernel*/*.hints /boot/kernel*/kernel | head
-rw-r--r--  1 root wheel -   270704 Feb 21 03:52:25 2024 /boot/kernel.GENERIC-MMCCAM/linker.hints
-rw-r--r--  1 root wheel -   270732 Feb 21 03:48:56 2024 /boot/kernel.GENERIC-DEBUG.good/linker.hints
-rw-r--r--  1 root wheel -   270732 Feb 21 03:48:35 2024 /boot/kernel/linker.hints
-rw-r--r--  1 root wheel -   270732 Feb 21 03:48:21 2024 /boot/kernel.GENERIC-NODEBUG.good/linker.hints
-rw-r--r--  1 root wheel -   270732 Feb 21 03:48:15 2024 /boot/kernel.GENERIC-NODEBUG/linker.hints
-r--r--r--  1 root wheel - 17932640 Feb 20 12:40:53 2024 /boot/kernel.GENERIC-MMCCAM/kernel
-r--r--r--  1 root wheel - 18401344 Feb 20 12:40:53 2024 /boot/kernel.GENERIC-NODEBUG/kernel
-r--r--r--  1 root wheel - 17934504 Feb 20 12:40:53 2024 /boot/kernel/kernel
-r--r--r--  1 root wheel - 17934400 Feb 16 22:44:28 2024 /boot/kernel.GENERIC-DEBUG.good/kernel
-r--r--r--  1 root wheel - 18405496 Feb 16 22:44:28 2024 /boot/kernel.GENERIC-NODEBUG.good/kernel

(I used kldxref on each of the various directories to produce
the lihniker.hints files.)

But booting after that got:

Mounting local filesystems:.
devmatch: Can't read linker hints file.
. . .
Starting devd.
devmatch: Can't read linker hints file.
devmatch: Can't read linker hints file.
devmatch: Can't read linker hints file.
. . .

Rebooting based on:

# grep '^kern.*="kernel' /boot/loader.conf
kernel="kernel"
kern.module_path="kernel"

also got the Can't read linker notices.

I've seen similar on armv7.

===
Mark Millard
marklmi at yahoo.com