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| author | sam <sam@FreeBSD.org> | 2008-03-12 19:09:58 +0000 |
|---|---|---|
| committer | sam <sam@FreeBSD.org> | 2008-03-12 19:09:58 +0000 |
| commit | e27789519d6d8592e65cd9fd2ec6e629e47a0f87 (patch) | |
| tree | 76413c96bde27db9e3c768b87c7f4f42b0f8bd15 /share/man/man4/uart.4 | |
| parent | 078a480e832ff2e17316580432aefc4fc0fb9fe5 (diff) | |
| download | FreeBSD-src-e27789519d6d8592e65cd9fd2ec6e629e47a0f87.zip FreeBSD-src-e27789519d6d8592e65cd9fd2ec6e629e47a0f87.tar.gz | |
document device hints including new ones to control rx fifo trigger
MFC after: 2 weeks
Diffstat (limited to 'share/man/man4/uart.4')
| -rw-r--r-- | share/man/man4/uart.4 | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/share/man/man4/uart.4 b/share/man/man4/uart.4 index ae2d456..be9d700 100644 --- a/share/man/man4/uart.4 +++ b/share/man/man4/uart.4 @@ -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 |
