ns8250: UART FCR is broken

From: void <void_at_f-m.fm>
Date: Tue, 25 Oct 2022 02:11:28 UTC
hello freebsd-current@,

this started appearing in dmesg

ns8250: UART FCR is broken
ns8250: UART FCR is broken
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
ns8250: UART FCR is broken
uart0: console (9600,n,8,1)
ns8250: UART FCR is broken
ns8250: UART FCR is broken
uart1: <16550 or compatible> port 0x2f8-0x2ff irq 3 on acpi0
ns8250: UART FCR is broken
ns8250: UART FCR is broken
ns8250: UART FCR is broken
uart2: <16550 or compatible> port 0x3e8-0x3ef irq 4 on acpi0
ns8250: UART FCR is broken

The system is a bhyve guest running main-n258723-e0c3f66b4d5f on amd64
with a lightly modified generic-nodebug. There's no physical hardware
attached to any com port on the host. Do I need to be concerned with this
or is it a known issue? is it a real hardware problem? The host runs many
bhyve guests.

TIA,