Messages in this thread | | | From | Richard Waltham <> | Subject | Re: 2.1.115 scsi funnies | Date | Mon, 10 Aug 1998 20:18:20 +0100 (BST) |
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Ville Voutilainen wrote: > > Howdy people, I have noticed some scsi peculiarities; > my ncr53c810 claims that it does not support synchronous > transfers, but AFAIK it does. > > --clip-- > > >From /proc/scsi/ncr53c8xx/0: > > Chip NCR53C810a, device id 0x1, revision id 0x12 > IO port address 0xe000, IRQ number 11 > Using memory mapped IO at virtual address 0xc4800000 > Synchronous period factor 25, max commands per lun 32 > > >From log: > > ncr53c810a-0-<4,*>: SYNC transfers not supported. > --clip-- > > Aren't these controversial? Inside /proc I can see a
Contradictory? ^^^^^^^ No. They refer to different things.
> sync period factor of 25, which should produce 10Mhz > as sync frequency, which seems quite appropriate. Then
/proc/scsi/ncr53c8xx/0 give details on the controller and its capabilities. It does not refer to any devices. This is what the controller is capable of.
> again at driver init (at boot) the kernel claims that > SYNC transfers are not supported.
This is what the device the controller has found is capable of. Target 4, whatever it is, is not capable of synchronous transfers.
> > Then another thing; I tried ide-scsi for my ATAPI cdrom > and when 'probe all luns on scsi devices' was enabled, > the cdrom got detected 8 times, on every possible lun.
Something funny with ide-scsi may be, or may be the drive. Some real SCSI devices will report more than one lun even though they only have one. That is generally caused by a bug in the SCSI device firmware.
My two real SCSI jukeboxes behave just fine.
> Now, it's easy to get around this by disabling the probe > option, but what if I had a CD jukebox _and_ I wanted to > use ide-scsi? It is probably harmless that the drive gets > detected 8 times, but it is just annoying if it can be > avoided. Boot parameters, anyone? >
Sorry can't help with this.
Richard
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-- Richard Waltham | Work: richard@digitalinterface.demon.co.uk At home in | Home: dormouse@farsrobt.demon.co.uk Southampton UK | 100421.1276@compuserve.com
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