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Commit cb426248 authored by Andrew Isaacson's avatar Andrew Isaacson Committed by Ralf Baechle
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pci-expmem-hack 


    
CFE 1.2.5 and earlier fails to turn on the ExpMemEn bit in the
PCIFeatureControl register, which means that DMA does not work
beyond physical address 01_0000_0000, ergo to DRAM beyond 1GB.
    
With ExpMemEn turned on, 01_0000_0000-0f_ffff_ffff is mapped,
so DMA works for up to 61 GB of DRAM.
    
Will be fixed in CFE 1.2.6 (yet to be released).
    
Signed-Off-By: default avatarAndy Isaacson <adi@broadcom.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 8a1417de

arch/mips/pci/pci-bcm1480.c

+8 −0
Original line number Diff line number Diff line
@@ -232,6 +232,14 @@ static int __init bcm1480_pcibios_init(void) 
		bcm1480_bus_status |= PCI_BUS_ENABLED;

	}



	/* turn on ExpMemEn */

	cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40));

	printk("PCIFeatureCtrl = %x\n", cmdreg);

	WRITECFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40),

			cmdreg | 0x10);

	cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40));

	printk("PCIFeatureCtrl = %x\n", cmdreg);



	/*

	 * Establish mappings in KSEG2 (kernel virtual) to PCI I/O

	 * space.  Use "match bytes" policy to make everything look