Starting points:
From the linux-on-dreamcast project, a PowerVR2->FB driver. The PowerVR MBX is a "Series 3" chip, however...
http://linuxsh.cvs.sourceforge.net/l....c?view=markup

The Dell Axim X50 uses a PowerVR MBX derivative, the Intel 2700G which appears to be the same chip.
http://www.handhelds.org/moin/moin.c...ximX50Hardware