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Based on the context provided, it seems like you are experiencing an issue with the display not showing anything after building and installing a new Linux kernel image on your iMX7 512 MB NAND module. Here are a few points to consider:
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Kernel Size Difference: The difference in size between the existing zImage (9.5 MB) and the newly created zImage (7.5 MB) could indicate that some necessary components or configurations might be missing in the new build. Ensure that all required drivers and configurations for your display are included in the kernel configuration.
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Kernel Configuration: Verify that the kernel configuration used for building the new zImage includes all necessary options for your specific hardware setup, especially for the display. You might need to compare the configuration of the existing working kernel with the new one to identify any missing options.
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Device Tree: Ensure that the device tree used with the new kernel is correctly configured for your display. The device tree should describe the hardware setup accurately, including the display interface and any specific settings required by the DWIN LCD.
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BSP Version and Git Tag: You mentioned using Kernel Git Tag v6.1.55 and meta-toradex-bsp-common BSP version 6.3.0. Double-check that these versions are compatible with your hardware and that they include support for your specific display.
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Serial Output: Since the system halts at “Starting kernel …”, it might be useful to enable early printk or other debugging options in the kernel to get more information about where the boot process is failing.
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Patches: Ensure that any necessary patches have been correctly applied to the kernel source, especially if they are required for your specific hardware or display.
If these steps do not resolve the issue, you may need to provide more specific details or consult additional resources or support channels for further assistance.
Please, also check if these links can help you solve your problem:
Screen Capture Issue on Wayland Application Running with Weston Compositor on iMX7D SoM.