* Reuse the code from EA-LPC1788's NOR flash support;
 * Improve NOR flash timings;
 * Place U-Boot environment at address 0x20000 (128 KBytes) in NOR
flash. We will store U-Boot image in the first 128 KBytes of NOR flash
when booting from NOR flash.
 * Place Linux kernel image at address 0x40000 (256 KBytes) in NOR
flash. We will store U-Boot image and U-Boot environment in the first
128 KBytes of NOR flash.