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This driver supports the Qlogic FASXXX family of chips. This driver
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only works with the ISA, VLB, and PCMCIA versions of the Qlogic
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FastSCSI! cards as well as any other card based on the FASXX chip
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(including the Control Concepts SCSI/IDE/SIO/PIO/FDC cards).
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This driver does NOT support the PCI version. Support for these PCI
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Qlogic boards:
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* IQ-PCI
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* IQ-PCI-10
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* IQ-PCI-D
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is provided by the qla1280 driver.
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Nor does it support the PCI-Basic, which is supported by the
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'am53c974' driver.
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PCMCIA SUPPORT
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This currently only works if the card is enabled first from DOS. This
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means you will have to load your socket and card services, and
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QL41DOS.SYS and QL40ENBL.SYS. These are a minimum, but loading the
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rest of the modules won't interfere with the operation. The next
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thing to do is load the kernel without resetting the hardware, which
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can be a simple ctrl-alt-delete with a boot floppy, or by using
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loadlin with the kernel image accessible from DOS. If you are using
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the Linux PCMCIA driver, you will have to adjust it or otherwise stop
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it from configuring the card.
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I am working with the PCMCIA group to make it more flexible, but that
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may take a while.
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ALL CARDS
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The top of the qlogic.c file has a number of defines that controls
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configuration. As shipped, it provides a balance between speed and
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function. If there are any problems, try setting SLOW_CABLE to 1, and
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then try changing USE_IRQ and TURBO_PDMA to zero. If you are familiar
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with SCSI, there are other settings which can tune the bus.
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It may be a good idea to enable RESET_AT_START, especially if the
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devices may not have been just powered up, or if you are restarting
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after a crash, since they may be busy trying to complete the last
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command or something. It comes up faster if this is set to zero, and
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if you have reliable hardware and connections it may be more useful to
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not reset things.
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SOME TROUBLESHOOTING TIPS
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Make sure it works properly under DOS. You should also do an initial FDISK
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on a new drive if you want partitions.
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Don't enable all the speedups first. If anything is wrong, they will make
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any problem worse.
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IMPORTANT
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The best way to test if your cables, termination, etc. are good is to
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copy a very big file (e.g. a doublespace container file, or a very
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large executable or archive). It should be at least 5 megabytes, but
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you can do multiple tests on smaller files. Then do a COMP to verify
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that the file copied properly. (Turn off all caching when doing these
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tests, otherwise you will test your RAM and not the files). Then do
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10 COMPs, comparing the same file on the SCSI hard drive, i.e. "COMP
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realbig.doc realbig.doc". Then do it after the computer gets warm.
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I noticed my system which seems to work 100% would fail this test if
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the computer was left on for a few hours. It was worse with longer
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cables, and more devices on the SCSI bus. What seems to happen is
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that it gets a false ACK causing an extra byte to be inserted into the
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stream (and this is not detected). This can be caused by bad
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termination (the ACK can be reflected), or by noise when the chips
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work less well because of the heat, or when cables get too long for
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the speed.
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Remember, if it doesn't work under DOS, it probably won't work under
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Linux.
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