Please make sure the below points are taken care of:
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The UART baud rate is set to 115200.
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The boot mode pins are properly configured for booting.—eMMC boot is selected
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Follow the QSG link below,
Get started with TI AM62Ax based Single Board Computer - iWave Systems
For further inquiries, please get in touch with mktg@iwave-global.com
Please find the detailed G55S product information in the below link,