From: Naru Sundar <nsundar@fulcrummicro.com>
To: linuxppc-embedded@ozlabs.org
Subject: ppc85xx DMA
Date: Mon, 5 Jun 2006 17:55:35 -0700 [thread overview]
Message-ID: <20060606005535.GB18144@fulcrummicro.com> (raw)
Dear sirs,
I am trying to add a DMA transfer component to my driver on linux 2.6 on a
ppc 8541. Following the steps listed in the reference manual, I write the
SAR, SATR, DAR, DATR and BCR registers before cycling the bit in the MR
register to start the transfer.
The SR register though indicates a transfer error as soon as I write the
DAR register. Clearly I've gotten the mapping wrong. I know what the
address I am trying to write to in kernel space is, what is unclear is
what address the DAR register is expecting.
Any help would be appreciated
-naru
next reply other threads:[~2006-06-06 0:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-06 0:55 Naru Sundar [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-06-06 1:39 ppc85xx DMA Liu Dave-r63238
2006-06-06 18:55 ` Naru Sundar
2006-06-06 21:16 ` Naru Sundar
2006-06-06 21:38 ` Naru Sundar
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