Recently, we were struggling to get three USB hosts working in PXA320. The operating system was Windows CE. We could get two of them working but not the third one. As you know, the PXA320 supports three USB host ports and we couldn’t do that due to some problems.
Finally, after two to three weeks of debugging we managed to hook it up. We thought we should probably share this experience with you guys. Please see our article to get more information on this.