103 lines
5.7 KiB
HTML
103 lines
5.7 KiB
HTML
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<!Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<TITLE>2.5.2.3 Problems with SCSI controllers and devices</TITLE>
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<BR> <HR><A NAME=tex2html2791 HREF="node87.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME=tex2html2789 HREF="node83.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME=tex2html2785 HREF="node85.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME=tex2html2793 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <A NAME=tex2html2794 HREF="node250.html"><IMG ALIGN=BOTTOM ALT="index" SRC="index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html2792 HREF="node87.html">2.5.3 Problems installing the </A>
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<B>Up:</B> <A NAME=tex2html2790 HREF="node83.html">2.5.2 Hardware problems</A>
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<B> Previous:</B> <A NAME=tex2html2786 HREF="node85.html">2.5.2.2 Problems recognizing hard </A>
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<BR> <HR> <P>
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<H3><A NAME=SECTION00452300000000000000>2.5.2.3 Problems with SCSI controllers and devices</A></H3>
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<P>
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<A NAME=secinstallprobshardwarescsi> </A>
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<P>
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<A NAME=1649> </A>
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<A NAME=1650> </A>
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<P>
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Presented here are some of the most common problems with SCSI controllers
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and devices such as CD-ROMs, hard drives, and tape drives. If you are
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having problems getting Linux to recognize your drive or controller,
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read on.
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<P>
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The Linux SCSI HOWTO (see Appendix <A HREF="node225.html#appsourcesnum">A</A>) contains much useful
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information on SCSI devices in addition to that listed here. SCSI can be
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particularly tricky to configure at times.
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<P>
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<UL><LI> <b>A SCSI device is detected at all possible ID's.</b> This is caused
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by strapping the device to the same address as the controller. You need to
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change the jumper settings so that the drive uses a different address from
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the controller itself.
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<P>
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<LI> <b>Linux reports sense errors, even if the devices are known to be
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error-free.</b> This can be caused by bad cables, or by bad termination. If your
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SCSI bus is not terminated at both ends, you may have errors accessing SCSI
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devices. When in doubt, always check your cables.
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<P>
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<LI> <b>SCSI devices report timeout errors.</b> This is usually caused by
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a conflict with IRQ, DMA, or device addresses. Also check that interrupts
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are enabled correctly on your controller.
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<P>
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<LI> <b>SCSI controllers using BIOS are not detected.</b> Detection of
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controllers using BIOS will fail if the BIOS is disabled, or if your
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controller's ``signature'' is not recognized by the kernel. See the Linux
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SCSI HOWTO for more information about this.
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<P>
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<LI> <b>Controllers using memory mapped I/O do not work.</b> This is caused
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when the memory-mapped I/O ports are incorrectly cached. Either mark the
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board's address space as uncacheable in the XCMOS settings, or disable
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cache altogether.
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<P>
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<LI> <b>When partitioning, you get a warning that ``cylinders <b>></b> 1024'', or
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you are unable to boot from a partition using cylinders numbered above 1023.</b>
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BIOS limits the number of cylinders to 1024, and any partition using
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cylinders numbered above this won't be accessible from the BIOS. As far as
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Linux is concerned, this affects only booting; once the system has booted
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you should be able to access the partition. Your options are to either
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boot Linux from a boot floppy, or boot from a partition using
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cylinders numbered below 1024. See Section <A HREF="node78.html#secinstalllinuxlilo">2.3.7</A>
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for information on creating a boot diskette or installing LILO.
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<P>
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<LI> <b>CD-ROM drive or other removeable media devices are not recognized
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at boot time.</b> Try booting with a CD-ROM (or disk) in the drive. This is
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necessary for some devices.
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<P>
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</UL>
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<P>
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If your SCSI controller is not recognized, you may need to
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force hardware detection at boot time. This is particularly important for
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BIOS-less SCSI controllers. Most distributions allow you to
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specify the controller IRQ and shared memory address when booting the
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installation media. For example, if you are using a TMC-8xx controller,
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you may be able to enter
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<P><TT> boot: <em>linux tmx8xx=<IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img78.gif">,<IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img79.gif"></em>
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<P></TT>
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at the LILO boot prompt, where <IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img80.gif"> is the IRQ of controller,
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and <IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img81.gif"> is the shared memory address. Whether or not
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you will be able to do this depends on the distribution of Linux you are
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using; consult your documentation for details.
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<P>
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<A NAME=1668> </A>
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<A NAME=1669> </A>
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<P>
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<A NAME=1670> </A>
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<A NAME=1671> </A>
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<P>
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<BR> <HR><A NAME=tex2html2791 HREF="node87.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME=tex2html2789 HREF="node83.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME=tex2html2785 HREF="node85.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME=tex2html2793 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <A NAME=tex2html2794 HREF="node250.html"><IMG ALIGN=BOTTOM ALT="index" SRC="index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html2792 HREF="node87.html">2.5.3 Problems installing the </A>
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<B>Up:</B> <A NAME=tex2html2790 HREF="node83.html">2.5.2 Hardware problems</A>
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<B> Previous:</B> <A NAME=tex2html2786 HREF="node85.html">2.5.2.2 Problems recognizing hard </A>
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<BR> <HR> <P>
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<BR> <HR>
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<P><ADDRESS>
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<I>Matt Welsh <BR>
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mdw@sunsite.unc.edu</I>
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</ADDRESS>
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