https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297673
Bug ID: 297673
Summary: uart: Denverton (C3758R) system locks up when userland
accesses the uart
Product: Base System
Version: 15.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
with this uart:
uart2: <Intel Denverton UART> port 0xe060-0xe067 mem 0xdfc08000-0xdfc080ff at
device 26.0 on pci0
uart2: Using 1 MSI message
uart2: console (115200,n,8,1)
the BIOS and FreeBSD kernel boot works fine over the serial port, but as soon
as a userland process uses the port, the system becomes unresponsive and has to
be power cycled. this is triggered by /etc/rc if booting on serial, or getty
if enabling /dev/ttyu2 in /etc/ttys after boot.
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