Subject: Re: a question of mpc8313, maybe simple

From: jumpingProgrammer <[email-masked]>
Date: Mon, 23 Jun 2008 18:13:41 -0700 (PDT)

Thanks a lot for answer my question.
But i am newhand and not very clear about it.
Do you mean:
1. in this case i do not need to include DMA when i "make menuconfig" ?
        The path is Device Drivers->DMA.
2. in this case i do not need add any DMA information in mpc8313erdb.dts?

Now i am reading PCI driver in kernel 2.6.20 to catch your meaning.

Scott Wood-2 wrote:
> 
> On Mon, Jun 23, 2008 at 05:48:07AM -0700, jumpingProgrammer wrote:
>> i am working with a board of mpc8313 using default mpc8313erdb.dts.
>> But i do not know how can i correctly use DMA to transport data from
>> memory
>> to a PCI device.
>> i tryed this
>> {
>>      .....
>>      request_irq(IRQ,....);
>>      request_dma(.....);
>>      ....
>> }
>> 
>> In request_irq() , i do not know what is the parameter IRQ.
> 
> Use pci_dev->irq.
> 
>> And , i did not find any words about DMA in mpc8313erdb.dts .
> 
> PCI devices can do bus-mastering DMA themselves; request_dma() is for ISA
> devices.
> 
> -Scott
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> 
> 

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