From dbdf04c40161f81d74e27f04e201acb3a5dfad69 Mon Sep 17 00:00:00 2001 From: Maxim Shchetynin Date: Fri, 20 Jul 2007 21:39:26 +0200 Subject: [CELL] driver for DDR2 memory on AXON 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: Maxim Shchetynin Signed-off-by: Arnd Bergmann --- arch/powerpc/platforms/Kconfig | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch/powerpc/platforms/Kconfig') diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig index 33545d352e92..932538a93c2b 100644 --- a/arch/powerpc/platforms/Kconfig +++ b/arch/powerpc/platforms/Kconfig @@ -272,4 +272,14 @@ config CPM2 you wish to build a kernel for a machine with a CPM2 coprocessor on it (826x, 827x, 8560). +config AXON_RAM + tristate "Axon DDR2 memory device driver" + depends on PPC_IBM_CELL_BLADE + default m + help + It registers one block device per Axon's DDR2 memory bank found + on a system. Block devices are called axonram?, their major and + minor numbers are available in /proc/devices, /proc/partitions or + in /sys/block/axonram?/dev. + endmenu -- cgit v1.2.2