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Jake Moilanen 569975591c [POWERPC] DMA 4GB boundary protection

There are many adapters which cannot handle DMAing across any 4 GB
boundary.  For instance, the latest Emulex adapters.

This normally is not an issue as firmware gives dma-windows under
4gigs.  However, some of the new System-P boxes have dma-windows above
4gigs, and this present a problem.

During initialization of the IOMMU tables, the last entry at each 4GB
boundary is marked as used.  Thus no mappings can cross the boundary.
If a table ends at a 4GB boundary, the entry is not marked as used.

A boot option to remove this 4GB protection is given w/ protect4gb=off.
This exposes the potential issue for driver and hardware development
purposes.

Signed-off-by: Jake Moilanen <moilanen@austin.ibm.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2007-04-13 03:55:13 +10:00

boot

[POWERPC] 85xx: Add initial MPC8544 DS platform files.

2007-03-29 19:39:27 -05:00

configs

Merge branch 'linux-2.6' into for-2.6.22

2007-04-13 03:50:03 +10:00

kernel

[POWERPC] DMA 4GB boundary protection

2007-04-13 03:55:13 +10:00

lib

[POWERPC] Make ppc64_defconfig without CONFIG_PPC_PSERIES build