[ECOS] Serial EEPROM/flash?
Paul D. DeRocco
Sun Aug 12 05:06:00 GMT 2007
Is there any driver available for serial EEPROM or flash devices like the
AT24Cxxx (I2C) or AT25Fxxx (SPI) series parts? In particular, I want to use
such a part with Redboot, so that I can store a boot script and other
configuration data in it.
This is for an AT91RM9200 system, which has an on-board boot ROM that can
boot a 16KB program from serial EEPROM. I figure I'll write a small bit of
code that sits in the beginning of the EEPROM; it will enable SDRAM, and
load Redboot from the next piece of the EEPROM; the tail end of the EEPROM
will hold the boot script and the configuration data. The application will
boot from a much larger SD card.
Do I need to write my own driver, or has anyone already done this? Or is
there some reason it can't be done? The v2 flash docs imply that there's no
requirement that the device actually be memory-mapped flash.
Ciao, Paul D. DeRocco
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