If I perform a
$ screen /dev/tty.usbserial-AJ02ZCYD 115200
here's what I get.
ets Jan 8 2013,rst cause:4, boot mode:(3,0)
wdt reset
load 0x40100000, len 3632, room 16
tail 0
chksum 0xc0
load 0x3ffe8000, len 352, room 8
tail 8
chksum 0x82
csum 0x82
OakBoot v1 - H,BU,0