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IRIX: system: IRIX: Customizing scsi parameters

(last edit: 2003-01-05)

troubleshooting hdd install

Quote: Replacing 0x83 by 0x13 for device on unit 2 means: - enable sync negotiation (0x01) - enable disconnects (0x02) - synchronous xfer rate of 8.0 Mhz (0x10) This means that the lowest bit is sync negotiation. So what you should do is to replace 0x83 by 0x82 per scsi device to disable sync negotiation. Let's look at the adp78 file again: u_char adp_device_options[ADP78_NUMADAPTERS][16] = { ! /* adapter 0 */ ! 0x83, 0x83, 0x83, 0x83, 0x03, 0x83, 0x83, 0x83, <- this 0x03 looks like some special entry for the CDROM (id 4 controller 0) ! 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, ! /* adapter 1 */ <- this is the external controller 1 ! 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, ! 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, ! What you should do is change the above line for controller 1. Suppose you have three disks in your external housing with id's 2, 3 and 4. To disable sync negotiation, you need to disable the bits, so the entry for controller 1 would look like: ! /* adapter 1 */ ! 0x83, 0x83, 0x82, 0x82, 0x82, 0x83, 0x83, 0x83, ! 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, ! Remember that the id's start from 0! How to disable wide negotiation i know now too: you have to reset bit 0x80! That explains the absence of the bit on id 4 controller 0: The CDROM is a narrow device... So to disable sync negotiation and wide negotiation on disks with id 2,3 and 4 on controller 1: ! /* adapter 1 */ ! 0x83, 0x83, 0x02, 0x02, 0x02, 0x83, 0x83, 0x83, ! 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, ! I hope this helps out your SCSI problems. Finally, do an "autoconfig -f" and reboot






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