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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: Andy Isaacson <adi@broadcom.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -232,6 +232,14 @@ static int __init bcm1480_pcibios_init(void)
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bcm1480_bus_status |= PCI_BUS_ENABLED;
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}
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/* turn on ExpMemEn */
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cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40));
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printk("PCIFeatureCtrl = %x\n", cmdreg);
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WRITECFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40),
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cmdreg | 0x10);
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cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40));
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printk("PCIFeatureCtrl = %x\n", cmdreg);
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/*
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* Establish mappings in KSEG2 (kernel virtual) to PCI I/O
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* space. Use "match bytes" policy to make everything look
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