• Maxim Shchetynin's avatar
    [CELL] driver for DDR2 memory on AXON · dbdf04c4
    Maxim Shchetynin authored
    The Axon bridge chip used on new Cell/B.E. based blade servers
    comes with a DDR2 memory controller that can be used to
    attach cheap memory modules, as opposed to the high-speed
    XDR memory that is used by the CPU itself.
    
    Since the memory controller does not participate in the
    cache coherency protocol, we can not use the memory direcly
    for Linux applications, but by providing a block device
    it can be used for swap space, temporary file storage and
    through the use of the direct_access block device operation
    for mapping into user addresses, when it is mounted with
    an appropriate file system.
    Signed-off-by: default avatarMaxim Shchetynin <maxim@de.ibm.com>
    Signed-off-by: default avatarArnd Bergmann <arnd.bergmann@de.ibm.com>
    dbdf04c4
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