>From: Douglas Gilbert <[EMAIL PROTECTED]>
>Meelis Roos wrote:
>>
>> sfgd> What you see is a result of a design flaw in the Linux kernel:
>>
>> sfgd> A "natural" implementation would look like this:
>> sfgd> - one or more SCSI parallel Host adapter drivers
>> sfgd> - one oe more SCSI serial Host adapter drivers (e.g. ieee 1034 ???
>Fire wire)
>> sfgd> - one or more IDE packet SCSI hostadapter drivers
>> sfgd> All working with a single SCSI glue library to:
>> sfgd> - CD-ROM driver
>> sfgd> - Tape driver
>> sfgd> ...
>>
>> AFAIK this is how Linux works. There are host adapters - real adapters,
>> ide-scsi virtual adapter, usb/i2o/parallel adapters (don't know whether IEEE
>> 1394 scsi exists already). And then there are general high-level drivers liks
>> scsi disks, scsi cdroms, scsi tapes etc. The same scsi cdrom driver is used
>> for "real" scsi cdroms and ide cdrom (in case the ide interface uses ide-scsi
>> virtual host adapter). I see no problem with Linux. I think you are seeing
>> hallucinations (sp?) here.
>>
>> The original problem was with choosing between ide-scsi (the virtual scsi
>> adapter that takes over an ide interface) and native ide cdrom driver (ide-cd)
>> for this interface. I find it natural that the generic scsi interface needs a
>> scsi host adapter (virtual or not) below it to function. So ide-scsi must be
>> used with this ide interface, not ide-cd. The cdrom becomes scsi cdrom to the
>> rest of the system - so what?
>What I think Joerg objects to is needing multiple libscg
>interfaces for Linux (several versions of sg [including his]
>and pg) with a possibility of more to come. When a pseudo
>driver such as ide-scsi is used then some magic is needed to
>stop the native ide stack taking ownership of the device.
Well, it is not a good idea to have too many programming interfaces for
the same thing (sending SCSI commands).
.... But in this case, there is no interface unless you change the default
Linux kernel settings to use ide-scsi.
J�rg
EMail:[EMAIL PROTECTED] (home) J�rg Schilling D-13353 Berlin
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