a3p125 is stored in the inner flash
data of a3p125 stored in the inner flash, the only way to program it is by JTAG port.
JTAG signals include TMS,TCK,TDO,TDI, RST.
It's impossible to simulate JTAG by e2prom signals of 3ds, which only include "CS, CLK, DATA[3..0]".
It's also impossible to simulate JTAG by the signals of the 3ds slot, which only include "CLK, CS1,CS2,RST, DATA[7..0]".
the maxium frequency of TCK is 10MHz and CLK metioned above is faster than 10MHz.
Gateway JTAG Pins are not accessible
R4i JTAG Pins are on the otherside of the board but nothing connects to them
only way to connect would be to hardwire some connections