this mboard: http://www.asrock.com/mb/overview.asp?cat=Specifications&Model=E350M1 has Chipset - AMD A50M Chipset but here
http://www.coreboot.org/Supported_Motherboards#Mini-ITX_.2F_Micro-ITX_.2F_Na... i have : ASRock E350M1 OK... AMD Fam14h AMD® SB800 Winbond™ W83627HF that is, the Chipset - AMD A50M is not referenced as the southbridge and instead i have SB800.
regarding the super IO, some folks suggested me that it is the same as the southbrige, that is the same chip, AMD A50M. but i wold like to know you opinion. for example the ASRock E350M1, has the Winbond™ W83627HF as the super IO
i thank you in advance for the answer best regards