ref: a5738f9f913058e63c48e77e0e01c0ceaa2f1c66
dir: /sys/src/boot/zynq/dat.h/
enum {
DHCPTIMEOUT = 2000,
ARPTIMEOUT = 1000,
TFTPTIMEOUT = 10000,
TZERO = 0x80000,
CONFSIZE = 65536,
CONF = TZERO - CONFSIZE,
};
#define nelem(x) (sizeof(x)/sizeof(*(x)))