you do whatever you were going to do anyway.
The root cause turns out explicitly to be because MMUs are so valuable: without one, you can’t run Linux, BSD, or Mach. Thus, when ARM split their IP portfolio into the A, R, and M-series cores, the low-cost M-series cores were forbidden from having an MMU to prevent price erosion of their high-end A-series cores. Instead, a proprietary hack known as the “MPU” was introduced that gives some memory security, but without an easy path to benefits such as swap memory and address space relocation.
Please make sure your browser supports JavaScript and cookies and that you are not，这一点在吃瓜中也有详细论述
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Periodic ZQ - Also known as ZQ Calibration Short (ZQCS). It is used to run ZQ calibration periodically to tune the 240Ω resistor that was described earlier.
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