Run the below commands in U-Boot:
IWG30M> mmc dev 0; fatls mmc 0
IWG30M> mmc dev 1; fatls mmc 1
IWG30M> env def -f -a
IWG30M> setenv sdbootdev ‘1’
IWG30M> saveenv
IWG30M> boot
For further inquiries, please get in touch with mktg@iwave-global.com
Please find the detailed G30M product information in the below link,