RE: PCI DMA_MR Problem

I see.

Thanks.

Jimmy

--- Liu Dave-r63238 <DaveLiu@freescale.com> wrote:

The memory map configuration registers is
little-endain. Be careful this
Please byte swap this
-Dave 

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I got a problem when I set the pci dmamr for

MPC8250 for DMA 

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PCI transfering data on linux kernel 2.6.17.
When I set the values for the pci_dmamr registers,

then print 

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the register values back, some bits can not be

set. Did 

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anybody know what are the problem, or I have to

set other stuff.

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Thanks.

The code like this:

volatile cpm2_map_t *immap = cpm2_immr;
immap->im_pci.pci_dmamr0 = 0x0042b00c;
immap->im_pci.pci_dmamr1 = 0x0042b00c;
immap->im_pci.pci_dmamr2 = 0x0042b00c;
immap->im_pci.pci_dmamr3 = 0x0042b00c;

printk("DMA0 MR = 0x%08x\n",
immap->im_pci.pci_dmamr0);
printk("DMA1 MR (0x%08x) = 0x%08x\n",
immap->im_pci.pci_dmamr1);
printk("DMA2 MR (0x%08x) = 0x%08x\n",
immap->im_pci.pci_dmamr2);
printk("DMA3 MR (0x%08x) = 0x%08x\n",
immap->im_pci.pci_dmamr3);

The results are following:
DMA0 MR (0xf0010500) = 0x0040b000
DMA1 MR (0xf0010580) = 0x0040b000
DMA2 MR (0xf0010600) = 0x0040b000
DMA3 MR (0xf0010680) = 0x0040b000



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