reference :https://github.com/lentinj/u-boot/blob/master/doc/README.autoboot
how to enable protect sonsole in uboot stage ?
we can add follow contest in include/configs/xxxx.h
+// add by panzidong for support protect uboot console
+#define CONFIG_AUTOBOOT_KEYED 1
+#define CONFIG_AUTOBOOT_PROMPT "Press passwd to abort autoboot in %d seconds"
+#define CONFIG_AUTOBOOT_DELAY_STR "ldgw"
+#define CONFIG_AUTOBOOT_STOP_STR "x1b"
+//#define DEBUG_BOOTKEYS 1