m25p26

You can try and create a design with a big on-chip memory for the CPU and run a memory test program from there. In Eclipse when you create a project, you have a memory test template that you can use, just ensure that the BSP is defined to only use the onchip memory for everything (text, bss, stack, heap...). You'll also probably have to turn on optimisations and use the small C library to make everything fit in the on-chip memory.