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用的是ARM V9仿真器，FLASH没烧过程序，即使短接了尝试USB FEL也不行，提示Could not measure total IR len. TDO is constant high. JTAG口和SD口共用，但是我并没有引出使用SD口也不行吗？需要重新映射吗，求指教！
@sanchez https://whycan.com/t_8407.html
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