Thanks a lot for Ian's reply! Now I'm starting to trace files in gcc/config/avr. But I can't find "avr-mcus.def" in the folder, neither in the whole gcc-4.6.2 source code. I googled and found that it's some kind of patch. So, maybe I can ignore "avr-mcus.def"? ----- 原始信件 ---- 寄件者： Ian Lance Taylor <iant@xxxxxxxxxx> 收件者： MathEE <math_ee@xxxxxxxxxxxx> 副本： "gcc-help@xxxxxxxxxxx" <gcc-help@xxxxxxxxxxx> 寄件日期： 2011/11/16 (三) 11:06 PM 主旨： Re: FW: How to add new target device (MCU)? MathEE <math_ee@xxxxxxxxxxxx> writes: > I'm trying to find out a way to add a new target MCU (say, T123) such that I can compile C and/or Assembly into instruction set of this T123. > Then, just like "-mmcu=attiny24", I can use "-mmcu=T123" to get the Hex/Bin for T123. > > Or shortly, how to support a new target device? > > Of course, I have all information needed about this T123. > But I have no idea what/how to do? > Could somebody please be so kind to help/teach me?? Look at the files in gcc/config/avr. Specifically, avr-mcus.def and avr-devices.c. Ian
