John McCarthy>Is this a common way to interface SPI flash to a processor?

duane>[ no, ie: pic32, arm, blackfin, ... etc ]

John McCarthy> Do these devices support SPI flash as system flash?
John McCarthy> Or is SPI flash just treated like another SPI peripheral 
(but not a bootable flash)?

They treat SPI as yet another SPI peripheral.  If something "boots from 
spi" - normally there is an internal masked boot rom - which uses the 
SPI peripheral to load the boot image.

-Duane.


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