Store data in Boot ROM of Pluto II

Pluto/-II/-3/-P boards

Store data in Boot ROM of Pluto II

Postby John Swenson » Mon Aug 18, 2008 6:57 am

I'd like to be able to store some configuration data in the boot ROM of a pluto II. Acording to Altera this can be done if the Boot ROM is an EPCS1. Is this used in the Pluto II?

If yes it seems fairly complicated, there is a core that lets you read and write unused space in the ROM, but the documentation says you can only access it with C routines running on a NIOS processor. This seems a little overkill to write a few bytes to the boot ROM.

Does anyone know a way to access the boot rom core without using a NIOS processor?


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Postby fpga4fun » Mon Aug 18, 2008 8:01 pm

Pluto-II uses an EPCS1 (or compatible).
It would be possible to store data in the boot-PROM. The Altera doc describes the protocol used by the EPCS1 so you don't have to use NIOS.

But you must
1. Boot the Pluto-II from the boot-PROM
2. Own a recent Pluto-II and set a jumper on the board
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