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Date: Sun, 1 Feb 2004 21:02:15 -0500 (EST)
From: Robert Watson <rwatson@freebsd.org>
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To: Randy Bush <randy@psg.com>
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cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: do i need ata with twe?
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On Sun, 1 Feb 2004, Randy Bush wrote:

> if i have sata with twe, and only have ata cdrom,
> 
>     ata0: at 0x1f0 irq 14 on atapci0
>     ata0: [MPSAFE]
>     ata1: at 0x170 irq 15 on atapci0
>     ata1: [MPSAFE]
>     fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
>     fdc0: FIFO enabled, 8 bytes threshold
>     fd0: <1440-KB 3.5" drive> on fdc0 drive 0
>     acd0: CDROM <CD-224E> at ata1-master PIO4
>     twed0: <Unit 0, TwinStor, Normal> on twe0
>     twed0: 70910MB (145224064 sectors)
>     twe0: command interrupt
> 
> how much of the ata kernel can i eliminate?  can i cut down to
> 
>     # ATA and ATAPI devices
>     device              ata
>     #device             atadisk         # ATA disk drives
>     #device             ataraid         # ATA RAID drives
>     device              atapicd         # ATAPI CDROM drives
>     #device             atapifd         # ATAPI floppy drives
>     #device             atapist         # ATAPI tape drives
>     #options    ATA_STATIC_ID           #Static device numbering

Yes.  twe is a fully self-sufficient driver, and doesn't rely on the ATA
driver framework.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Senior Research Scientist, McAfee Research