Marek Neuzil was kind enough to provide a working SDRAM example for Processor Expert. He posted it here: Re: can't read data back from SDRAM.
I modified it slightly to get some time measurement into it for better benchmarking of the SDRAM performance.
Unfortunetly, the numbers I get are worse than expected.
I'm getting arround 57 MB/s of memset performance.
I would expect something that is derived from a theoretical value of 240 MB/s (60 MHz bus clock x 32 Bit Buswidth)