[ubuntu] Anyone with ASRock AM1H-ITX & 5350 know where to find the chipset drivers?

According to reviews on Newegg and Amazon, I should download the AMD chipset driver/drivers directly from AMD, because of many owners having trouble with these drivers obtained from anywhere else. One review said it can be found on the AMD drivers page under a "option downloads" link, but I do not see any such thing. The manual driver search (where I can select OS as Ubuntu) only seems to give proprietary graphics drivers, and down at the bottom-right of the main drivers page is a link to the "AMD chipset, AHCI, USB 3.0 and RAID drivers", but it only shows for Windows.

Anyone know which I need?