rockchip: config: add a bootcmd for rkimg

Try emmc first, and then nand;
Try boot_android first, and then bootrkp;

Change-Id: I21ae59bbfe420adc66409766aca05d44db7e19aa
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

include/configs/evb_rk3128.h

@@ -20,4 +20,7 @@
 		"stdout=serial,vidconsole\0" \
 		"stderr=serial,vidconsole\0"
 
+#undef CONFIG_BOOTCOMMAND
+#define CONFIG_BOOTCOMMAND RKIMG_BOOTCOMMAND
+
 #endif

include/configs/rockchip-common.h

@@ -61,6 +61,12 @@
 	"name=security,size=2M,uuid=${uuid_gpt_security};" \
 	"name=userdata,size=-,uuid=${uuid_gpt_userdata};"
 
+#define RKIMG_BOOTCOMMAND \
+	"if mmc dev 0; then setenv devtype mmc; setenv devnum 0;" \
+	"else if rknand dev 0; then setenv devtype mmc; setenv devnum 0; fi;" \
+	"fi; boot_android ${devtype} ${devnum};" \
+	"bootrkp;"
+
 #endif
 
 /*