MREGS_BCONFIG
sbus_writeb(MREGS_BCONFIG_BSWAP | MREGS_BCONFIG_64TS, mregs + MREGS_BCONFIG);
sbus_writeb(MREGS_BCONFIG_RESET, mregs + MREGS_BCONFIG);
u8 tmp = sbus_readb(mregs + MREGS_BCONFIG);