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Upstream: FMC DMA support #21
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The FMC controller on the Aspeed SoCs support DMA to access the flash
modules. It can operate in a normal mode, to copy to or from the flash
module mapping window, or in a checksum calculation mode, to evaluate
the best clock settings for reads.
Patchset needs to be pushed to mainline after reworking the DMA accesses
with a specific address space.
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