GIUPIOD_REG
dbg_bit_display(vrgiu_regread_4(sc, GIUPIOD_REG));
preg[0] = vrgiu_regread_4(sc, GIUPIOD_REG);
printf(" PIOD: %08x\n", vrgiu_regread_4(sc, GIUPIOD_REG));
on = (vrgiu_regread_4(sc, GIUPIOD_REG) & (1 << port));
reg[0] = vrgiu_regread_4(sc, GIUPIOD_REG);
vrgiu_regwrite_4(sc, GIUPIOD_REG, reg[0]);