Bryan> Some systems do not set up 64-bit maps on systems with 2GB
Bryan> or less of memory installed, so we have to fall back to
Bryan> trying a 32-bit setup.
Which systems does this happen on?
PowerPC with U3 or U4 northbridge, i.e. Maple or PowerMac G5 systems.
If the IOMMU (DART) is disabled, we have a 32-bit only DMA mask. The
DART will be disabled by default if there is 2GB or less of memory (as
it isn't needed then).
I'm just curious, because mthca has
err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
if (err) {
dev_warn(&pdev->dev, "Warning: couldn't set 64-bit PCI DMA mask.
\n");
and I've never had a single report of that warning triggering.
That's only because I never used those cards on systems with fewer
than 4GB of memory :-)
Segher
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