uboot中擦写nand的参数quiet是什么玩意

struct nand_erase_options {
	ulong length;		/* number of bytes to erase */
	ulong offset;		/* first address in NAND to erase */
	int quiet;		/* don\'t display progress messages */
	int jffs2;		/* if true: format for jffs2 usage
				 * (write appropriate cleanmarker blocks) */
	int scrub;		/* if true, really clean NAND by erasing
				 * bad blocks (UNSAFE) */
};

不只是显示作用吧，感觉对flash影响挺大，谁能告诉我uboot中擦写nand的参数quiet是什么玩意