Follow-up Comment #3, bug #47937 (project avr-libc):
While I was researching my bug report to Atmel, I noticed a new part
definition file in Atmel Studio 7.0.934: the ATmega324PB. This part will have
two SPI modules, so it makes sense that all of its SPI registers and bits are
suffixed with 0 and 1. I suspect that Atmel is purposely renaming the SPI
registers on the old parts for consistency's sake. They renamed the SPI
registers for the ATmega164{A,P,PA} and ATmega324{A,P,PA}, but they have not
yet done it for the ATmega644* or ATmega1284*.
I will still contact them anyway, because I noticed an inconsistency: in
ATmega164A.atdf they defined a bit to be named SPR01 when they really meant
SPR10. That's definitely an error, but in general their adding of these
prefixes might not be an error.
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