SPI and I2C, was Re: Raspberry Pi and America,

2 Jul 2012

...
   [F]or example,
when writing a driver for an SBus device, I have no
 problem assuming I'm on a SPARC.  Would that be a 32 bit SPARC, or 64 bit
SPARC? 
32, in most cases, for me.  Of course, that's no excuse, since there
_are_ SBus sparc64 machines; absent a reason to do otherwise, I would
design such a driver to run on either.  (I might not get it right, of
course, and have trouble testing it because my usual sparc64 test
machines aren't SBus, but that's a separate issue.  If I were doing
very much SBus driver writing I probably would ensure I had a sparc64
SBus machine set up for testing on.)

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SPI and I2C, was Re: Raspberry Pi and America,