rt-thread/bsp/mini2440/Ext_RAM.ini

/******************************************************************************/
/* Ext_RAM.INI: External RAM (SDRAM) Initialization File                      */
/******************************************************************************/
// <<< Use Configuration Wizard in Context Menu >>>                           // 
/******************************************************************************/
/* This file is part of the uVision/ARM development tools.                    */
/* Copyright (c) 2005-2008 Keil Software. All rights reserved.                */
/* This software may only be used under the terms of a valid, current,        */
/* end user licence from KEIL for a compatible version of KEIL software       */
/* development tools. Nothing else gives you the right to use this software.  */
/******************************************************************************/


FUNC void SetupForStart (void) {

// <o> Program Entry Point
  PC = 0x30000000;
}


FUNC void Init (void) {

  _WDWORD(0x4A000008, 0xFFFFFFFF);      // Disable All Interrupts

  _WDWORD(0x53000000, 0x00000000);      // Disable Watchdog Timer
  
                                        // Clock Setup 
                                        // FCLK = 300 MHz, HCLK = 100 MHz, PCLK = 50 MHz
  _WDWORD(0x4C000000, 0x0FFF0FFF);      // LOCKTIME
  _WDWORD(0x4C000014, 0x0000000F);      // CLKDIVN
  _WDWORD(0x4C000004, 0x00043011);      // MPLLCON
  _WDWORD(0x4C000008, 0x00038021);      // UPLLCON
  _WDWORD(0x4C00000C, 0x001FFFF0);      // CLKCON

                                        // Memory Controller Setup for SDRAM
  _WDWORD(0x48000000, 0x22000000);      // BWSCON
  _WDWORD(0x4800001C, 0x00018005);      // BANKCON6
  _WDWORD(0x48000020, 0x00018005);      // BANKCON7
  _WDWORD(0x48000024, 0x008404F3);      // REFRESH
  _WDWORD(0x48000028, 0x00000032);      // BANKSIZE
  _WDWORD(0x4800002C, 0x00000020);      // MRSRB6
  _WDWORD(0x48000030, 0x00000020);      // MRSRB7

  _WDWORD(0x56000000, 0x000003FF);      // GPACON: Enable Address lines for SDRAM
}


// Reset chip with watchdog, because nRST line is routed on hardware in a way 
// that it can not be pulled low with ULINK

_WDWORD(0x40000000, 0xEAFFFFFE);        // Load RAM addr 0 with branch to itself
CPSR = 0x000000D3;                      // Disable interrupts
PC   = 0x40000000;                      // Position PC to start of RAM
_WDWORD(0x53000000, 0x00000021);        // Enable Watchdog
g, 0                                    // Wait for Watchdog to reset chip

Init();                                 // Initialize memory
LOAD rtthread-mini2440.axf INCREMENTAL         // Download program
SetupForStart();                        // Setup for Running
g, main                                 // Goto Main