https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194952
Bug ID: 194952
Summary: uart(4) needs BayTrail support for Minnowboard Max
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: ema...@freebsd.org
See PR 192324
Intel's BayTrail SoC has 16550-like UARTs with some extra functionality. They
appear to require some special configuration as well; presumably the firmware
performs this configuration and enables a compatibility mode for CSM booting.
Just adding the PCI device IDs is not sufficient.
none7@pci0:0:30:3: class=0x078000 card=0x72708086 chip=0x0f0a8086 rev=0x0c
hdr=0x00
vendor = 'Intel Corporation'
device = 'ValleyView LPIO1 HSUART Controller'
class = simple comms
cap 01[80] = powerspec 3 supports D0 D3 current D0
none8@pci0:0:30:4: class=0x078000 card=0x72708086 chip=0x0f0c8086 rev=0x0c
hdr=0x00
vendor = 'Intel Corporation'
device = 'ValleyView LPIO1 HSUART Controller'
class = simple comms
cap 01[80] = powerspec 3 supports D0 D3 current D0
Related Linux commits are b15e5691 and 29897087
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