Memory Map

Memory Map

NXP LPC2106

Flash

128K $00000000-$0001FFFF

RAM

64K $40000000-$0000FFFF

• The first $200 bytes of RAM are reserved for use by the bootloader and the IAP routines. This is handled by the linker script lpc2106.ld setting the .ram section to start at 0x40000200.
• After that, the assembly file for the primitives (riscy.asm) allocates RAM for the foreground's data and return stacks and for the CPU's hardware stack and sets the label freeRAM just past the stacks.
• The function RESET-FORTH in forth.lisp initializes *ep* (the RAM allocation pointer used during the compilation of high-level Forth) to the value of freeRAM set by the assembling/linking of riscy.asm.

Other NXP ARM chips

As far as I know, all of them start flash at $00000000 and start RAM at $40000000. The main differences will be how much flash and how much RAM the chip contains.

The linker file, lpc2106.ld, should work for all or most of the NXP ARM chips, since we put the stacks in low RAM and do not explicitly reference the tops of flash and RAM.