• Jens.Osterkamp@de.ibm.com's avatar
    [PATCH] powerpc/cell: add iommu support for larger memory · 49d65b3a
    Jens.Osterkamp@de.ibm.com authored
    So far, the iommu code was hardwired to a linear mapping
    between 0x20000000 and 0x40000000, so it could only support
    512MB of RAM.
    
    This patch still keeps the linear mapping, but looks for
    proper ibm,dma-window properties to set up larger windows,
    this makes the maximum supported RAM size 2GB.
    
    If there is anything unusual about the dma-window properties,
    we fall back to the old behavior.
    
    We also support switching off the iommu completely now
    with the regular iommu=off command line option.
    Signed-off-by: default avatarArnd Bergmann <arndb@de.ibm.com>
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    49d65b3a
iommu.c 13.9 KB