Based on kernel version 3.15.4. Page generated on 2014-07-07 09:04 EST.
1 2 This driver supports the Qlogic FASXXX family of chips. This driver 3 only works with the ISA, VLB, and PCMCIA versions of the Qlogic 4 FastSCSI! cards as well as any other card based on the FASXX chip 5 (including the Control Concepts SCSI/IDE/SIO/PIO/FDC cards). 6 7 This driver does NOT support the PCI version. Support for these PCI 8 Qlogic boards: 9 10 * IQ-PCI 11 * IQ-PCI-10 12 * IQ-PCI-D 13 14 is provided by the qla1280 driver. 15 16 Nor does it support the PCI-Basic, which is supported by the 17 'am53c974' driver. 18 19 PCMCIA SUPPORT 20 21 This currently only works if the card is enabled first from DOS. This 22 means you will have to load your socket and card services, and 23 QL41DOS.SYS and QL40ENBL.SYS. These are a minimum, but loading the 24 rest of the modules won't interfere with the operation. The next 25 thing to do is load the kernel without resetting the hardware, which 26 can be a simple ctrl-alt-delete with a boot floppy, or by using 27 loadlin with the kernel image accessible from DOS. If you are using 28 the Linux PCMCIA driver, you will have to adjust it or otherwise stop 29 it from configuring the card. 30 31 I am working with the PCMCIA group to make it more flexible, but that 32 may take a while. 33 34 ALL CARDS 35 36 The top of the qlogic.c file has a number of defines that controls 37 configuration. As shipped, it provides a balance between speed and 38 function. If there are any problems, try setting SLOW_CABLE to 1, and 39 then try changing USE_IRQ and TURBO_PDMA to zero. If you are familiar 40 with SCSI, there are other settings which can tune the bus. 41 42 It may be a good idea to enable RESET_AT_START, especially if the 43 devices may not have been just powered up, or if you are restarting 44 after a crash, since they may be busy trying to complete the last 45 command or something. It comes up faster if this is set to zero, and 46 if you have reliable hardware and connections it may be more useful to 47 not reset things. 48 49 SOME TROUBLESHOOTING TIPS 50 51 Make sure it works properly under DOS. You should also do an initial FDISK 52 on a new drive if you want partitions. 53 54 Don't enable all the speedups first. If anything is wrong, they will make 55 any problem worse. 56 57 IMPORTANT 58 59 The best way to test if your cables, termination, etc. are good is to 60 copy a very big file (e.g. a doublespace container file, or a very 61 large executable or archive). It should be at least 5 megabytes, but 62 you can do multiple tests on smaller files. Then do a COMP to verify 63 that the file copied properly. (Turn off all caching when doing these 64 tests, otherwise you will test your RAM and not the files). Then do 65 10 COMPs, comparing the same file on the SCSI hard drive, i.e. "COMP 66 realbig.doc realbig.doc". Then do it after the computer gets warm. 67 68 I noticed my system which seems to work 100% would fail this test if 69 the computer was left on for a few hours. It was worse with longer 70 cables, and more devices on the SCSI bus. What seems to happen is 71 that it gets a false ACK causing an extra byte to be inserted into the 72 stream (and this is not detected). This can be caused by bad 73 termination (the ACK can be reflected), or by noise when the chips 74 work less well because of the heat, or when cables get too long for 75 the speed. 76 77 Remember, if it doesn't work under DOS, it probably won't work under 78 Linux.