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Diffstat (limited to 'Documentation/arm/IXP4xx')
| -rw-r--r-- | Documentation/arm/IXP4xx | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/arm/IXP4xx b/Documentation/arm/IXP4xx index d4c6d3aa0c25..43edb4ecf27d 100644 --- a/Documentation/arm/IXP4xx +++ b/Documentation/arm/IXP4xx | |||
| @@ -85,7 +85,7 @@ IXP4xx provides two methods of accessing PCI memory space: | |||
| 85 | 2) If > 64MB of memory space is required, the IXP4xx can be | 85 | 2) If > 64MB of memory space is required, the IXP4xx can be |
| 86 | configured to use indirect registers to access PCI This allows | 86 | configured to use indirect registers to access PCI This allows |
| 87 | for up to 128MB (0x48000000 to 0x4fffffff) of memory on the bus. | 87 | for up to 128MB (0x48000000 to 0x4fffffff) of memory on the bus. |
| 88 | The disadvantadge of this is that every PCI access requires | 88 | The disadvantage of this is that every PCI access requires |
| 89 | three local register accesses plus a spinlock, but in some | 89 | three local register accesses plus a spinlock, but in some |
| 90 | cases the performance hit is acceptable. In addition, you cannot | 90 | cases the performance hit is acceptable. In addition, you cannot |
| 91 | mmap() PCI devices in this case due to the indirect nature | 91 | mmap() PCI devices in this case due to the indirect nature |