Using Bestcomm API (DMA) on MPC5200b with Linux?

[Jon Smirl]

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 at 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 at 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
>>
>>
>>
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>
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-- 
Jon Smirl
jonsmirl at gmail.com