[ECOS] [Fwd: AT91SAM7SE DMA with external SDRAM]

Andrew Lunn andrew@lunn.ch
Fri Sep 21 12:20:00 GMT 2007

> From: jc.caquet@kerlink.fr
> To: ecos-discuss-owner@ecos.sourceware.org
> Subject: AT91SAM7SE DMA with external SDRAM
> Date: Fri, 21 Sep 2007 10:08:45 +0200
> X-Spam-Status: No, score=2.9 required=5.0 tests=AWL,BAYES_60,
> 	MSGID_FROM_MTA_ID,NO_REAL_NAME autolearn=no version=3.0.4
> Dear all,
> we are facing a pb when sending data over serial link on AT91SAM7SE-EK
> board. We use external SDRAM connected on EBI, this SDRAM is OK as we made
> some intensive read/write tests over the whole memory.

This might not be conclusive. The DMA engine could be doing a
different type of memory access as to normal reads/writes.

> Does anybody know if there are some restrictions/bugs when using DMA with
> external memory connected on EBI ?

You should probably be asking Atmel....


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