MIPSSIM_UART0_ADDR
MIPSSIM_ISA_IO_BASE + MIPSSIM_UART0_ADDR + com_data);
if (comcnattach(&mcp->mc_iot, MIPSSIM_UART0_ADDR, COMCNRATE,
{ "com", MIPSSIM_UART0_ADDR, 2 },