207 lines
7 KiB
Text
207 lines
7 KiB
Text
<!-- $Id: sio.sgml,v 1.5 1997-02-22 12:59:22 peter Exp $ -->
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<!-- The FreeBSD Documentation Project -->
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<!--
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<!DOCTYPE linuxdoc PUBLIC "-//FreeBSD//DTD linuxdoc//EN" [
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<!ENTITY % authors SYSTEM "authors.sgml">
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%authors;
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]>
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-->
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<sect2><heading>Configuring the <tt>sio</tt> driver<label id="sio"></heading>
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<p>The <tt>sio</tt> driver provides support for NS8250-,
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NS16450-, NS16550 and NS16550A-based EIA RS-232C (CCITT
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V.24) communications interfaces. Several multiport
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cards are supported as well. See the <tt>sio(4)</tt>
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manual page for detailed technical documentation.
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<sect3><heading>Digi International (DigiBoard) PC/8</heading>
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<p><em>Contributed by &a.awebster;.<newline>26 August
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1995.</em>
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Here is a config snippet from a machine with
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a Digi International PC/8 with 16550. It has 8 modems connected
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to these 8 lines, and they work just great. Do not
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forget to add <tt>options COM_MULTIPORT</tt> or it
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will not work very well!
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<tscreen><verb>
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device sio4 at isa? port 0x100 tty flags 0xb05
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device sio5 at isa? port 0x108 tty flags 0xb05
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device sio6 at isa? port 0x110 tty flags 0xb05
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device sio7 at isa? port 0x118 tty flags 0xb05
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device sio8 at isa? port 0x120 tty flags 0xb05
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device sio9 at isa? port 0x128 tty flags 0xb05
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device sio10 at isa? port 0x130 tty flags 0xb05
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device sio11 at isa? port 0x138 tty flags 0xb05 irq 9 vector siointr
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</verb></tscreen>
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The trick in setting this up is that the MSB of the
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flags represent the last SIO port, in this case 11 so
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flags are 0xb05.
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<sect3><heading>Boca 16</heading>
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<p><em>Contributed by &a.whiteside;.<newline>26 August
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1995.</em>
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The procedures to make a Boca 16 pord board with
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FreeBSD are pretty straightforward, but you will need
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a couple things to make it work:
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<enum>
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<item>You either need the kernel sources installed
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so you can recompile the necessary options or
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you will need someone else to compile it for you.
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The 2.0.5 default kernel does <bf>not</bf> come with
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multiport support enabled and you will need to add
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a device entry for each port anyways.
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</item>
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<item>Two, you will need to know the interrupt and IO
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setting for your Boca Board so you can set these
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options properly in the kernel.</item>
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</enum>
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One important note - the actual UART chips for the
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Boca 16 are in the connector box, not on the internal
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board itself. So if you have it unplugged, probes of
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those ports will fail. I have never tested booting with
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the box unplugged and plugging it back in, and I
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suggest you do not either.
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If you do not already have a custom kernel
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configuration file set up, refer to <ref
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id="kernelconfig" name="Kernel Configuration"> for
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general procedures. The following are the specifics
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for the Boca 16 board and assume you are using the
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kernel name MYKERNEL and editing with vi.
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<enum>
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<item>Add the line
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<tscreen><verb>
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options COM_MULTIPORT
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</verb></tscreen>
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to the config file.
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</item>
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<item>Where the current <tt>device sio
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<em>xxx</em></tt> lines are, you will need to add
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16 more devices. <em>Only the last device
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includes the interrupt vector for the
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board</em>. (See the <tt>sio(4)</tt> manual page
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for detail as to why.)
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The following example is for a Boca Board with an
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interrupt of 3, and a base IO address 100h. The
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IO address for Each port is +8 hexadecimal from
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the previous port, thus the 100h, 108h, 110h...
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addresses.
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<tscreen><verb>
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device sio1 at isa? port 0x100 tty flags 0x1005
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device sio2 at isa? port 0x108 tty flags 0x1005
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device sio3 at isa? port 0x110 tty flags 0x1005
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device sio4 at isa? port 0x118 tty flags 0x1005
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[...]
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device sio15 at isa? port 0x170 tty flags 0x1005
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device sio16 at isa? port 0x178 tty flags 0x1005 irq 3 vector siointr
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</verb></tscreen>
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The flags entry <em>must</em> be changed from
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this example unless you are using the exact same
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sio assignments. Flags are set according to
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0x<em>MYY</em> where <em>M</em> indicates the
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minor number of the master port (the last port on
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a Boca 16) and <em>YY</em> indicates if FIFO is
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enabled or disabled(enabled), IRQ sharing is
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used(yes) and if there is an AST/4 compatible IRQ
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control register(no).
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In this example,
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<tscreen><verb>
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flags 0x1005
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</verb></tscreen>
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indicates that the master port is sio16. If I
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added another board and assigned sio17 through
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sio28, the flags for all 16 ports on
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<em>that</em> board would be 0x1C05, where 1C
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indicates the minor number of the master port.
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Do not change the 05 setting.</item>
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<item>Save and complete the kernel configuration,
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recompile, install and reboot.
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Presuming you have successfully installed the
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recompiled kernel and have it set to the correct
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address and IRQ, your boot message should
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indicate the successful probe of the Boca ports
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as follows: (obviously the sio numbers, IO and
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IRQ could be different)
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<tscreen><verb>
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sio1 at 0x100-0x107 flags 0x1005 on isa
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sio1: type 16550A (multiport)
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sio2 at 0x108-0x10f flags 0x1005 on isa
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sio2: type 16550A (multiport)
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sio3 at 0x110-0x117 flags 0x1005 on isa
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sio3: type 16550A (multiport)
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sio4 at 0x118-0x11f flags 0x1005 on isa
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sio4: type 16550A (multiport)
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sio5 at 0x120-0x127 flags 0x1005 on isa
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sio5: type 16550A (multiport)
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sio6 at 0x128-0x12f flags 0x1005 on isa
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sio6: type 16550A (multiport)
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sio7 at 0x130-0x137 flags 0x1005 on isa
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sio7: type 16550A (multiport)
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sio8 at 0x138-0x13f flags 0x1005 on isa
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sio8: type 16550A (multiport)
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sio9 at 0x140-0x147 flags 0x1005 on isa
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sio9: type 16550A (multiport)
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sio10 at 0x148-0x14f flags 0x1005 on isa
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sio10: type 16550A (multiport)
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sio11 at 0x150-0x157 flags 0x1005 on isa
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sio11: type 16550A (multiport)
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sio12 at 0x158-0x15f flags 0x1005 on isa
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sio12: type 16550A (multiport)
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sio13 at 0x160-0x167 flags 0x1005 on isa
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sio13: type 16550A (multiport)
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sio14 at 0x168-0x16f flags 0x1005 on isa
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sio14: type 16550A (multiport)
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sio15 at 0x170-0x177 flags 0x1005 on isa
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sio15: type 16550A (multiport)
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sio16 at 0x178-0x17f irq 3 flags 0x1005 on isa
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sio16: type 16550A (multiport master)
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</verb></tscreen>
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If the messages go by too fast to see, <tt>dmesg
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> more</tt> will show you the boot
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messages.</item>
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<item>Next, appropriate entries in <tt>/dev</tt> for the devices
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must be made using the <tt>/dev/MAKEDEV</tt>
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script. After becoming root:
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<tscreen>
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# cd /dev<newline>
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# ./MAKEDEV tty1<newline>
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# ./MAKEDEV cua1<newline>
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<em>(everything in between)</em><newline>
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# ./MAKEDEV ttyg<newline>
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# ./MAKEDEV cuag
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</tscreen>
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If you do not want or need callout devices for some
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reason, you can dispense with making the <tt>cua*</tt>
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devices.</item>
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<item>If you want a quick and sloppy way to make
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sure the devices are working, you can simply plug
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a modem into each port and (as root) <tt>echo at
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> ttyd*</tt> for each device you have
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made. You <em>should</em> see the RX lights flash
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for each working port.</item>
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</enum>
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