panic sdhci_bcm0-slot0 controller timeout when HDMI not attached

[tech-lists]

On Fri, Jan 15, 2021 at 01:38:22AM +0000, tech-lists wrote:
>Hi,
>
>context is 13.0-ALPHA1 #0 main-c255963-g54c743e5b29 with custom no-debug
>kernel
>
>I have an rpi4/8GB which boots off sdcard. It has an attached usb3 disk
>which is ZFS and has the data. The guts of the OS is on the sdcard though.
>It's been working fine up till a week or so ago when I decided to
>update FreeBSD. On reboot it failed to come back. It normally
>runs headless and keyboardless.
>
>I found that the machine would boot normally *only* if a screen was plugged
>into the HDMI port. If the screen was disconnected, console output revealed
>eventual drop to debugger a short while after:
>
>sdhci_bcm0-slot0: Controller timeout
>
>(In the output there is also "Root mount waiting for: CAM" but this is
>deliberate and is there to allow usb3 to wake up before ZFS)
>
>The controller never times out if HDMI is attached. I thought at first
>it also needed a keyboard but that's not the case.
>
>boot failure:
>https://cloud.zyxst.net/~john/FreeBSD/current/rpi4b/badboot.txt
>
>successful boot:
>https://cloud.zyxst.net/~john/FreeBSD/current/rpi4b/goodboot.txt

In the end, had to rebuild the system as it was from
FreeBSD-13.0-CURRENT-arm64-aarch64-RPI3-20201105-ef87bd449eb.img.xz and
do this
https://cloud.zyxst.net/~john/FreeBSD/current/rpi4b/installing.txt
again.

Is it safe to follow 13-stable yet? Do modifications need to be made to 
the msdos partition?

thanks,
-- 
J.
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