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Larry Finger <Larry.Finger@lwfinger.net> writes: > I am trying to debug a bcm43xx DMA problem on an x86_64 system with 3 > GB RAM. Depending on the particular chip and its implementation, dma > transfers may use 64-, 32-, or 30-bit addressing, with the problem > interface using 30-bit addressing. From test prints, the correct mask > (0x3FFFFFFF) is supplied to pci_set_dma_mask and > pci_set_consistent_dma_mask. Neither call returns an error. In > addition, several x86_64 systems with more than 1 GB RAM have worked > with the current code. 30bit DMA has be bounced through GFP_DMA. The driver needs special code for this. You can look at the b44 driver for a working reference. The pci_dma_* interfaces on x86-64 only support masks >= 0xffffffff, anything smaller has to be handled manually. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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