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dm6446 nor flash access performance

Hi,

We have a product that uses dm6446 with nor flash which is pretty close to the evm design. We setup the nor flash so we can have a jffs2 partition on it, everything works, but we found that nor flash accessing (mounting, reading,writing is very slow). a little google research reveals that the nor flash may be configured at the slowest speed possible. So, gurus, please help me speed it up, either in U-boot or kernel, preferrably in kernel. Thanks!