SP = *(int*)0x08001000;
PC = *(int*)0x08001004;

define symbol Code_start = 0x00000000;

// Memory Regions -----------------------------------------------------------
// 256K ROM memory
define symbol ROM_start = 0x00000000;
define symbol ROM_end = 0x00007FFF;
// 16K RAM memory
define symbol RAM_start = 0x40000000;
define symbol RAM_end = 0x40001FFF;

// Memory Block Sizes
define symbol SIZE_CSTACK = 0x20; // Dummy System/User Stack Size (Not Used!)
define symbol SIZE_SVCSTACK = 0x180; // Supervisor Mode (Main Work Mode)
define symbol SIZE_IRQSTACK = 0x200;
define symbol SIZE_FIQSTACK = 0x40; //
define symbol SIZE_XXXSTACK = 0x20; // 32bytes Shared Stack for Abort/Undefined Instruction and IAP Buffer
define symbol SIZE_HEAP_RTOS = 0x400; // 1Kb - Dummy _minimal_ space for Memory Manager

define memory mem with size = 4G;
define region ROM = mem:[from ROM_start to ROM_end];
define region RAM = mem:[from RAM_start to RAM_end - SIZE_XXXSTACK];
define region RAM_endblock = mem:[from RAM_end - SIZE_XXXSTACK + 1 to RAM_end];

define block CSTACK with alignment=8, size = SIZE_CSTACK { };
define block SVC_STACK with alignment=8, size = SIZE_SVCSTACK { };
define block IRQ_STACK with alignment=8, size = SIZE_IRQSTACK { };
define block FIQ_STACK with alignment=8, size = SIZE_FIQSTACK { };
define block HEAP_RTOS with alignment=8, size = SIZE_HEAP_RTOS { };
define block XXX_BLOCK with alignment=8, size = SIZE_XXXSTACK { };
define block CHECKSUM { readonly section .checksum };

initialize by copy { readwrite };
do not initialize { section .noinit };

place in ROM { readonly section .intvec };
place in ROM { readonly };
place in ROM { block CHECKSUM };

place in RAM { readwrite,
block CSTACK, block SVC_STACK, block IRQ_STACK, block FIQ_STACK };
place in RAM { block HEAP_RTOS };

place in RAM_endblock {
block XXX_BLOCK };

define block CSTACK with alignment = 8, size = 0x000 {};
define block HEAP   with alignment = 8, size = 0x000 {};

do not initialize  {section .bssStk};
do not initialize  {section .bssStkMain};
...
place in RAM_regionA {section .BITBAND_RAM, section .dma, section .ethernet};
place in RAM_regionA {rw, first block CSTACK, section .bssMemNoFill, block HEAP};

#pragma data_alignment = 8
__no_init static OS_STK taskADEStk[64 + STK_SIZE_ISR_NFP] @ ".bssStk";