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Based on the context provided, it seems that the issue with the GPIO voltage dropping from 3.3V to 1.8V after boot is likely related to the device tree configuration or power management settings. Here are some steps you can take to address this issue:
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Review Device Tree Settings: Double-check the device tree configuration to ensure that the GPIO pins (SODIMM pins 49, 51, 53, and 190) are set to maintain a 3.3V output throughout the operation. Look for any settings that might be altering the voltage after boot.
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Check Configuration: Verify that the configuration for these pins is consistent and correctly set to output 3.3V. Ensure that there are no conflicting settings that might cause the voltage to drop.
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Investigate Power Management Settings: Examine any power management features or settings that could be affecting the GPIO voltage levels after the system has initialized. These settings might be causing the voltage to change post-boot.
If these steps do not resolve the issue, further investigation into the specific device tree settings and power management configurations may be necessary.
Please, also check if these links can help you solve your problem: