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TDA2x QSPI boot的问题

我现在用的一款MT25Q512的flash芯片,想实现QSPI boot。当前使用single read的模式,能够正常工作;但是当使用quad read的模式时候,当我一使能芯片的quad mode,再去读flash的寄存器,就没有读到值(比如读设备id,在使能quad mode之前,是能够正常读取),不知道目前SPL阶段能否支持qspi的quad mode呢?