GM_GPCR_SPEED_100
gpcr &= ~((GM_GPCR_SPEED_1000 | GM_GPCR_SPEED_100));
gpcr |= GM_GPCR_SPEED_100;
#define GM_GPCR_SPEED_1000 (GM_GPCR_GIGS_ENA | GM_GPCR_SPEED_100)