my be i use the wrong NAND start address

[xiangfu]

if i use

dfu-util -a 0 -R -D ./led_on
nand write.e 0x32000000 0 0x1000

download led_on to the NAND.
what the "start" in next function should be?
int nand_read_ll(unsigned char *buf, unsigned long start_addr, int size)
 

i see this :
neo1973-nand:0x00040000(u-boot),
0x00040000(u-boot_env),
0x00800000(kernel),
0x000a0000(splash),
0x00040000(factory),
0x0f420000(rootfs)

is the "start" is 0x00040000?