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| author | Jeff Garzik <jeff@garzik.org> | 2006-03-29 17:18:49 -0500 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-03-29 17:18:49 -0500 |
| commit | e02a4cabfcb9a999b74a2e2e6f13ffcb7ff2d606 (patch) | |
| tree | 2f3db60be4c57eca2a4c3ab3f3122dcf1ec0c624 /Documentation/DMA-mapping.txt | |
| parent | 600511e86babe3727264a0883a3a264f6fb6caf5 (diff) | |
| parent | f3cab8a0b1a772dc8b055b7affa567a366627c9e (diff) | |
Merge branch 'master'
Diffstat (limited to 'Documentation/DMA-mapping.txt')
| -rw-r--r-- | Documentation/DMA-mapping.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/DMA-mapping.txt b/Documentation/DMA-mapping.txt index 684557474c1..ee4bb73683c 100644 --- a/Documentation/DMA-mapping.txt +++ b/Documentation/DMA-mapping.txt @@ -199,6 +199,8 @@ address during PCI bus mastering you might do something like: "mydev: 24-bit DMA addressing not available.\n"); goto ignore_this_device; } +[Better use DMA_24BIT_MASK instead of 0x00ffffff. +See linux/include/dma-mapping.h for reference.] When pci_set_dma_mask() is successful, and returns zero, the PCI layer saves away this mask you have provided. The PCI layer will use this |