There are many posts on here about the problems getting an external SDRAM working properly when the processor is running at 204MHz. Well, we have found a configuration that works!
I've attached it here for people to try; let me know how you get on.
By the way if you use the NXP driver for the RTC, you will find that RTC_Init() very helpfull reconfigures one of the SDRAM lines to be a 32.768kHz CLKOUT, which obviously stops the SDRAM working. I've attached a corrected version. Note this is based on the CMSIS driver pack from the repository - it might already be fixed in the LPCOpen distribution, I haven't looked.
Hitex (UK) Ltd
Original Attachment has been moved to: lpc43xx_rtc.c.zip
Original Attachment has been moved to: system_LPC43xx_0.c.zip