[u-boot] rockchip: add low_ram info to bootargs

Signed-off-by: hmz007 <hmz007@gmail.com>

u-boot/arch/arm/mach-rockchip/board.c

@@ -1367,6 +1367,13 @@ static void bootargs_add_android(bool verbose)
 #endif
 }
 
+static void bootargs_add_low_mem(void)
+{
+	if (gd->ram_size < SZ_3G) {
+		env_update("bootargs", "androidboot.low_ram=1");
+	}
+}
+
 static void bootargs_add_panel(void)
 {
 #ifdef CONFIG_VENDOR_FRIENDLYELEC
@@ -1473,6 +1480,7 @@ char *board_fdt_chosen_bootargs(void *fdt)
 		printf("## bootargs(u-boot): %s\n\n", env_get("bootargs"));
 
 	bootargs_add_dtb_dtbo(fdt, verbose);
+	bootargs_add_low_mem();
 	bootargs_add_panel();
 	bootargs_add_partition(verbose);
 	bootargs_add_fwver(verbose);