Solved Install/boot hangs on uart0

[Aurel_B]

Hi,

I'm trying to install FreeBSD 13.2/14.0-RC2 on an MSI Cubi 5 12M (https://www.msi.com/Business-Productivity-PC/Cubi-5-12M) with an Intel® Core™ i3-1215U and 64GB RAM / 2 TB NVMe SSD. It hangs during boot, the last lines printed are:

uart0: <16550 or compatible> at port 0x3f8 irg 4 flags 0x10 on isa0
uart0: non-PNP ISA device will be removed from GENERIC in FreeBSD 14undefined

If I boot in verbose mode I'll get one additonal line:

pcib0: allocated type 4 (0x2f8-0x2f8) for rid 0 of uart1

Full screenshot is attached as well as a lspci -v output from Linux Mint.

BIOS is already updated, there is not much to configure in the BIOS itself. Linux Mint boots without a hitch.

Google didn't help either, do you guys have any suggestions?

Cheers, Aurel

 

[Aurel_B]

Just checked: same thing with 15-CURRENT :-(

I also disabled uart and atrtc -> still stuck. I disabled ACPI but this resulted in a kernel panic right after boot. I switched vt mode to

hw.vga.textmode=1
hw.vga.acpi_ignore_no_vga=1

but still no change. The kernel just hangs (it still responds to pressing the power button with a "Acpi0sExecute: task queue not started"). Where do I go from here?

 

[covacat]

see this thread

Solved - Boot hangs on cherrytrail uefi system (installer + preinstalled stick), no dmesg written

Edit: Solved, I had to disable the uarts in /boot/device.hints After disabling ACPI and APIC via /boot/loader.conf.local I saw the entropy harvester tried to harvest nonexistent uarts... :) In /boot/device.hints I had to replace the UART hints there with "disabled" settings...

forums.freebsd.org

 

[Aurel_B]

Thank you so much, that did the trick! I had to disable both uart0 & 1, in my first attempt I just disabled 0. So:

set hint.uart.0.disabled="1"
set hint.uart.1.disabled="1"

makes the sytem boot just fine. Very releaved, been using FreeBSD as my primary home server for almost 20 years and I definitely want to stay with it

 

[covacat]

i think disabling just uart1 will do but im not 100% sure

 

[Aurel_B]

I can confirm that, setting just hint.uart.1.disabled="1" is sufficient!

 

[jetoblaster]

Just wanting to say thank you, I have a few of these and was stuck with the same issue.

 

[sgunn]

I also just had the same issue and this was very helpful.

Can anyone explain why this is an issue in the first place? I'd love to understand it.

 

[richardtoohey2]

I also just had the same issue and this was very helpful.

Can anyone explain why this is an issue in the first place? I'd love to understand it.

The Cherrytrail link in post 3 says that the code assumes there is UART and hangs forever when it cannot find one.