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=> fdt get value bootargs /chosen bootargs
=> fdt get value stdout-path /chosen stdout-path
libfdt fdt_getprop(): FDT_ERR_NOTFOUND
=> fdt list /chosen
chosen {
	bootargs = "earlyprintk=sunxi-uart,0x05000000 loglevel=8 initcall_debug=1 console=ttyS0 init=/init";
	linux,initrd-start = <0x00000000 0x00000000>;
	linux,initrd-end = <0x00000000 0x00000000>;
};