According to sprufg5a, GIO0 pin's state is latched at reset and could be read from BOOTCFG register bit GIO0_RESET. That doesn't seem to work on my h/w, always reads 0. Reading the state of this pin (once the code starts running) shows a 1, oscilloscope confirms that it's at logic high when reset pulse goes high.
Are there any limitations to this feature, like only certain boot modes that it works with?
