>From: "Richard B. Johnson" <root@chaos.analogic.com>
>> >From root@chaos.analogic.com Fri Jul 12 22:18:47 2002
>>
>> >As much as I hate IDE, IDE isn't going away. All my systems use SCSI
>> >so on machines that have CD/ROMS, I use your libraries and your tools.
>>
>> >Maybe somebody should make CD/ROM code that directly talks to IDE via
>> >/dev/hdwhatever, instead of expecting you to modify your code that
>> >has worked so well for so long.
>>
>> This would be a really bad idea.
>>
>> Such a change would force me to add a 6th (and unneeded) new interface.
>> Why? What problem would be solved if you did introduce such an interface?
>>
>Well for one thing it eliminates the requirement to
>include SCSI interface code on machines that don't
>have SCSI. That's the practical aspect.
>Now, the esoteric. Do you truly think that it is
>proper to encapsulate devices in various layers?
>The IDE interface, if it wasn't for the bug-workarounds,
>is just a floppy disk interface that uses a different
>controller chip. It is register-based, not message-
>based. If you throw in a message-based control layer
>(SCSI), what problems are you solving? It's a
>rhetorical question. No answer is required.
If you like to use the floppy only via the ATA registers, then
you don't like to be able to format media?
BTW: the overhead to set up DMA is higher than the overhead to set up a SCSI
CDB.
Jörg
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
js@cs.tu-berlin.de (uni) If you don't have iso-8859-1
schilling@fokus.gmd.de (work) chars I am J"org Schilling
URL: http://www.fokus.gmd.de/usr/schilling ftp://ftp.fokus.gmd.de/pub/unix
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