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-<!-- $Id: kernelconfig.sgml,v 1.2 1998-05-19 01:46:05 jkh Exp $ -->
-<!-- The FreeBSD Documentation Project -->
-
- <sect>
- <heading>Kernel Configuration<label id="kernelconfig"></heading>
-
- <sect1>
- <heading>
- I'd like to customize my kernel. Is it difficult?
- <label id="make-kernel">
- </heading>
-
- <p>Not at all! Check out the <url url="../handbook/kernelconfig.html"
- name="kernel config section of the Handbook">.
-
- <p><bf/NOTE:/ I recommend making a dated snapshot of your kernel
- in <tt/kernel.YYMMDD/ after you get it all working, that way if
- you do something dire the next time you play with your configuration
- you can boot that kernel instead of having to go all the way back
- to <tt/kernel.GENERIC/. This is particularly important if you're
- now booting off a controller that isn't supported in the GENERIC
- kernel (yes, personal experience).
-
- <sect1>
- <heading>
- My kernel compiles fail because <tt/&lowbar;hw&lowbar;float/ is missing.
- </heading>
-
- <p>Let me guess. You removed <htmlurl
- url="http://www.freebsd.org/cgi/man.cgi?npx(4)" name="npx0"> from your
- kernel configuration file because you don't have a math co-processor,
- right? Wrong! :-) The <tt/npx0/ is <bf/MANDATORY/. Even if you don't
- have a mathematic co-processor, you <bf/must/ include the <tt/npx0/
- device.
-
- <sect1>
- <heading>Interrupt conflicts with multi-port serial code.</heading>
-
- <p><bf/Q./ When I compile a kernel with multi-port serial code, it
- tells me that only the first port is probed and the rest skipped due to
- interrupt conflicts. How do I fix this?
-
- <p><bf/A./ The problem here is that FreeBSD has code built-in to keep
- the kernel from getting trashed due to hardware or software
- conflicts. The way to fix this is to leave out the IRQ settings
- on all but one port. Here is a example:
-
- <verb>
- #
- # Multiport high-speed serial line - 16550 UARTS
- #
- device sio2 at isa? port 0x2a0 tty irq 5 flags 0x501 vector siointr
- device sio3 at isa? port 0x2a8 tty flags 0x501 vector siointr
- device sio4 at isa? port 0x2b0 tty flags 0x501 vector siointr
- device sio5 at isa? port 0x2b8 tty flags 0x501 vector siointr
- </verb>
-
- <sect1>
- <heading>How do I enable support for QIC-40/80 drives?</heading>
-
- <p>You need to uncomment the following line in the generic config
- file (or add it to your config file), add a ``<tt/flags 0x1/''
- on the <htmlurl url="http://www.freebsd.org/cgi/man.cgi?fdc(4)"
- name="fdc"> line and recompile.
-
- <verb>
-controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2 flags 0x1 vector fdintr
-disk fd0 at fdc0 drive 0 ^^^^^^^^^
-disk fd1 at fdc0 drive 1
-#tape ft0 at fdc0 drive 2
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- </verb>
-
- <p>Next, you create a device called <tt>/dev/ft0</tt> by going into
- <tt>/dev</tt> and run the following command:
-
- <verb>
- sh ./MAKEDEV ft0
- </verb>
-
- <p>for the first device. <tt/ft1/ for a second one and so on.
-
- <p>You will have a device called <tt>/dev/ft0</tt>, which you can
- write to through a special program to manage it called
- ``<tt/ft/'' - see the man page on <htmlurl
- url="http://www.freebsd.org/cgi/man.cgi?ft" name="ft">
- for further details.
-
- <p>Versions previous to <tt/-current/ also had some trouble dealing
- with bad tape media; if you have trouble where <tt/ft/ seems to
- go back and forth over the same spot, try grabbing the latest
- version of <tt/ft/ from <tt>/usr/src/sbin/ft</tt> in
- <tt/-current/ and try that.
-
- </sect>
-