From owner-cvs-src@FreeBSD.ORG  Fri Jul 14 21:57:03 2006
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Date: Fri, 14 Jul 2006 15:53:55 -0600 (MDT)
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To: scottl@samsco.org
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org
Subject: Re: cvs commit: src/sys/arm/at91 at91_spi.c at91_spiio.h
 at91_spireg.h
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In message: <44B81042.2090009@samsco.org>
            Scott Long <scottl@samsco.org> writes:
: Warner Losh wrote:
: > imp         2006-07-14 21:35:59 UTC
: > 
: >   FreeBSD src repository
: > 
: >   Modified files:
: >     sys/arm/at91         at91_spi.c at91_spireg.h 
: >   Removed files:
: >     sys/arm/at91         at91_spiio.h 
: >   Log:
: >   MF p4:
: >   
: >   Adapt to forthcoming spi framework.  The ioctls for SPI commands and such
: >   belong in the higher level driver.
: >   
: 
: SCSI Parallel Interface?

SPI == Serial Peripheral Interface.  It is common in the embedded
world.  The 'bus' is nothing more than 4 signals: chip select, clock,
MOSI (master out, slave in) and MISO (master in, slave out).  Lots of
cool things live on the spi bus, but I'll just be committing support
for AT45 DataFlash parts.  The framework is general enough to support
other things.  In one of the hardware hacking lists I'm on, people
were talking about writing a driver for a SPI Ethernet whatsit, but
I'm unsure how that works, since there's no interrupt signal on this
bus...

Warner