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From the HW point of view, the performance of command read mode is greater than user mode slightly. Thus, dirmap read framework is introduced to achieve this goal. In dirmap_create, command read mode is configured. Usually, the decoded address area with flash size is assigned to each CS. CPU can thus access the SPI flash as normal memory in dirmap_read function. Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>