NIOS II EPCS bootloader

I have a Cyclone III and am trying to use EPCS to boot my NIOS II code. I can flash the device with the NIOS Flash Programmer without error but removing the JTAG header and cycling power doesn't appear to start my code. The Verilog code appears to be running. I've configured the NIOS reset vector to point to the EPCS flash controllers address. I've configured the syslib linker section as follows:

Program memory: sdram

Read-only data memory: onchip_memory

Read/Write data memory onchip_memory

Heap memory: onchip_memory

Stack memory: onchip_memory

The syslib RTOS settings is set to "none (single-threaded)"

Any debugging tips would be greatly appreciated!

Thanks,

Jim