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document device hints including new ones to control rx fifo trigger

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MFC after:	2 weeks
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sam 2008-03-12 19:09:58 +00:00
parent 078a480e83
commit e27789519d
1 changed files with 28 additions and 1 deletions
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29
share/man/man4/uart.4
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@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd March 29, 2006
.Dd March 12, 2008
.Dt UART 4
.Os
.\"
@ -41,6 +41,33 @@
.Pp
.Cd "device scc"
.Cd "device uart"
.Pp
.Bd -ragged offset -compact
In
.Pa /boot/device.hints :
.Cd hint.uart.0.disabled="1"
.Cd hint.uart.0.baud="38400"
.Cd hint.uart.0.port="0x3f8"
.Cd hint.uart.0.flags="0x10"
.Ed
.Pp
With
.Ar flags
encoded as:
.Bl -tag -compact -width 0x000000
.It 0x00010
device is potential system console
.It 0x00080
use this port for remote kernel debugging
.It 0x00100
set RX FIFO trigger level to ``low'' (NS8250 only)
.It 0x00200
set RX FIFO trigger level to ``medium low'' (NS8250 only)
.It 0x00400
set RX FIFO trigger level to ``medium high'' (default, NS8250 only)
.It 0x00800
set RX FIFO trigger level to ``high'' (NS8250 only)
.El
.\"
.Sh DESCRIPTION
The