From: Scott Wood <scottwood@freescale.com>
To: suresh suresh <sureshtang@gmail.com>
Cc: linuxppc-embedded@ozlabs.org, Siva Prasad <sprasad@bivio.net>
Subject: Re: Linuxppc-embedded Digest, Vol 35, Issue 33
Date: Tue, 17 Jul 2007 11:02:18 -0500 [thread overview]
Message-ID: <469CE80A.5080204@freescale.com> (raw)
In-Reply-To: <e5eb93010707162259l2e78c524s32ff260b3d930bdb@mail.gmail.com>
suresh suresh wrote:
> MPC8280 has internal memory space which contains Dualport(Dp) RAM. In the
> DpRAM we allocate some tables and these has to store pointer of the buffers
> which are allocated in external memory. Core will use this pointer to
> access
> the buffers, basically these buffers are used for DMA.
>
> Using IMMR register we can get physical address of the internal memory. Now
> can I store the address return by the kmalloc() function? or I should
> convert it into physical?
Yes, you need to convert it to physical. As I said earlier, use the DMA
mapping API (described in Documentation/DMA-mapping.txt) to do so.
Specifically, look at the dma_map_single() function.
-Scott
next prev parent reply other threads:[~2007-07-17 16:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.1061.1184600645.8639.linuxppc-embedded@ozlabs.org>
2007-07-16 15:58 ` Linuxppc-embedded Digest, Vol 35, Issue 33 Siva Prasad
2007-07-16 16:09 ` Scott Wood
2007-07-17 5:59 ` suresh suresh
2007-07-17 16:02 ` Scott Wood [this message]
2007-07-17 22:41 ` Siva Prasad
2007-07-17 22:51 ` Scott Wood
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