Document comconsole_port and comconsole_pcidev loader variables.
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@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 27, 2011
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.Dd January 7, 2012
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.Dt LOADER 8
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.Os
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.Sh NAME
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@ -419,6 +419,43 @@ was compiled.
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Changes to the
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.Va comconsole_speed
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variable take effect immediately.
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.It Va comconsole_port
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Defines the base i/o port used to access console UART
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(i386 and amd64 only).
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If the variable is not set, its assumed value is 0x3F8, which
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corresponds to PC port COM1, unless overriden by
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.Va BOOT_COMCONSOLE_PORT
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variable during the compilation of
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.Nm .
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Setting the
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.Va comconsole_port
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variable automatically set
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.Va hw.uart.console
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environment variable to provide a hint to kernel for location of the console.
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Loader console is changed immediately after variable
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.Va comconsole_port
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is set.
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.It Va comconsole_pcidev
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Defines the location of a PCI device of the 'simple communication'
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class to be used as the serial console UART (i386 and amd64 only).
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The syntax of the variable is
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.Li 'bus:device:function[:bar]' ,
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where all members must be numeric, with possible
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.Li 0x
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prefix to indicate a hexadecimal value.
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The
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.Va bar
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member is optional and assumed to be 0x10 if omitted.
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The bar must decode i/o space.
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Setting the variable
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.Va comconsole_pcidev
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automatically sets the variable
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.Va comconsole_port
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to the base of the selected bar, and hint
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.Va hw.uart.console .
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Loader console is changed immediately after variable
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.Va comconsole_pcidev
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is set.
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.It Va console
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Defines the current console or consoles.
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Multiple consoles may be specified.
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