There is a 5x2 pin, 1.27mm pitch header J1 south of the BIOS flash. It follows the pinout of the Dediprog adaptor board:
+------+ | 1 2 | 1: HOLD 2 2: CS 2 | 3 4 | 3: CS 1 4: VCC | 5 6 | 5: MISO 6: HOLD 1 | 7 8 | 7: 8: CLK | 9 10 | 9: GND 10: MOSI +------+
Pins 3 to 10 directly map to the regular SPI flash pinout.
There is also a JP17 around. Ideally, it should be closed during programming (isolates the SPI bus from the southbridge):
+---+ | 1 | 1: SF100-I/O3 | 2 | 2: GND +---+