From: jimmy liu <jimmyzhmliu@yahoo.com>
To: linuxppc-embedded@ozlabs.org
Subject: PCI DMA_MR Problem
Date: Fri, 11 Aug 2006 06:57:46 -0700 (PDT) [thread overview]
Message-ID: <20060811135746.68402.qmail@web53115.mail.yahoo.com> (raw)
I got a problem when I set the pci dmamr for MPC8250
for DMA PCI transfering data on linux kernel 2.6.17.
When I set the values for the pci_dmamr registers,
then print the register values back, some bits can not
be set. Did anybody know what are the problem, or I
have to set other stuff.
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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next reply other threads:[~2006-08-11 13:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-11 13:57 jimmy liu [this message]
2006-08-14 3:53 ` PCI DMA_MR Problem Liu Dave-r63238
2006-08-14 12:38 ` jimmy liu
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