From: "Jon Smirl" <jonsmirl@gmail.com>
To: "Matt Sealey" <matt@genesi-usa.com>
Cc: arieswar24b@yahoo.de, linuxppc-embedded@ozlabs.org
Subject: Re: Using Bestcomm API (DMA) on MPC5200b with Linux?
Date: Fri, 24 Oct 2008 11:14:49 -0400 [thread overview]
Message-ID: <9e4733910810240814p6d43eb0by4fc3c913b60063c3@mail.gmail.com> (raw)
In-Reply-To: <4900FA72.1040201@genesi-usa.com>
Was the new BestComm support in the 2.6.23.1 kernel he is using?
On Thu, Oct 23, 2008 at 6:28 PM, Matt Sealey <matt@genesi-usa.com> wrote:
> You need to write a task that does the DMA operation you want; GenBD is
> actually pretty generic and lets you just copy from one place to another.
>
> The API is pretty simple; make sure genbd is compiled in, get the task
> structure using bcom_gen_bd_[tr]x_init, and then.. uhh.. this is where I
> always forget.
>
> There is a way to submit a buffer descriptor and have the engine basically
> perform that transfer. I think it's bcom_prepare_next_buffer and then
> bcom_submit_next_buffer.
>
> Actually I can't even FIND those functions in the Linux tree right now, but
> they have to be in there because the FEC driver uses them..
>
> --
> Matt Sealey <matt@genesi-usa.com>
> Genesi, Manager, Developer Relations
>
> Dave Best wrote:
>>
>> I am trying to connect a FPGA/FIFO with my MPC5200b on a phytec PCM 030
>> board while running a 2.6.23.1 Linux.
>>
>> The Linux Kernel source contains an implementation for the Bestcomm API in
>> the form of a driver for ethernet (fec) and ATA.(situated in the
>> arch-powerpc/sysdev/bestcomm path) I tried to make use of it but i've run
>> into some problems.
>>
>> So i tried to include the API in a module to utilize its functionality but
>> no luck till now.
>>
>> Freescale supports the Bestcomm DMA API not on an OS level. So the problem
>> is adopting this API into a Linux environment, which distinguishes between
>> kernel space and user space while writing to the appropriate registers.
>>
>> Further information is very hard to find for such a common task as
>> starting a DMA transfer.
>>
>> Dave
>>
>>
>>
>> _______________________________________________
>> Linuxppc-embedded mailing list
>> Linuxppc-embedded@ozlabs.org
>> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
>
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
--
Jon Smirl
jonsmirl@gmail.com
next prev parent reply other threads:[~2008-10-24 15:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-23 13:00 Using Bestcomm API (DMA) on MPC5200b with Linux? Dave Best
2008-10-23 22:28 ` Matt Sealey
2008-10-24 15:14 ` Jon Smirl [this message]
2008-10-27 16:18 ` Matt Sealey
2008-12-04 17:04 ` Juergen Beisert
2008-12-04 10:01 ` Dave Best
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