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The eink waveforms are programmed into a chip mounted on the eink flex cable, not in the mmc. The device identifier (pcbsn, serial, and other idme vars) is in the image for K3 and earlier, but on a K4/K5 those areas are write-only (and read as all zeros). To read stuff from those areas you need to get it from a driver /proc interface. Even the idme tool does that (read from a /proc, write to /dev/mmcblk0).
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