RE: PCI DMA_MR Problem

The memory map configuration registers is little-endain. Be careful this
Please byte swap this
-Dave=20

=20
I got a problem when I set the pci dmamr for MPC8250 for DMA=20
PCI transfering data on linux kernel 2.6.17.
When I set the values for the pci_dmamr registers, then print=20
the register values back, some bits can not be set. Did=20
anybody know what are the problem, or I have to set other stuff.
=20
Thanks.
=20
The code like this:
=20
volatile cpm2_map_t *immap =3D cpm2_immr;
immap->im_pci.pci_dmamr0 =3D 0x0042b00c;
immap->im_pci.pci_dmamr1 =3D 0x0042b00c;
immap->im_pci.pci_dmamr2 =3D 0x0042b00c;
immap->im_pci.pci_dmamr3 =3D 0x0042b00c;
=20
printk("DMA0 MR =3D 0x%08x\n",
immap->im_pci.pci_dmamr0);
printk("DMA1 MR (0x%08x) =3D 0x%08x\n",
immap->im_pci.pci_dmamr1);
printk("DMA2 MR (0x%08x) =3D 0x%08x\n",
immap->im_pci.pci_dmamr2);
printk("DMA3 MR (0x%08x) =3D 0x%08x\n",
immap->im_pci.pci_dmamr3);
=20
The results are following:
DMA0 MR (0xf0010500) =3D 0x0040b000
DMA1 MR (0xf0010580) =3D 0x0040b000
DMA2 MR (0xf0010600) =3D 0x0040b000
DMA3 MR (0xf0010680) =3D 0x0040b000
=20
=20
=20
__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection=20
around http://mail.yahoo.com=20
_______________________________________________
Linuxppc-embedded mailing list
Linuxppc-embedded@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
=20