lib_sdram.c

基于AT91SAM9260的bootloader

//*----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : lib_sdram.c
//* Object              : 
//*
//* 1.0 06/25/02 ED     : SDRAM Controller test
//* 1.1 15/05/2003		: address range added 
//*----------------------------------------------------------------------------
#include "main.h"
//#include <stdio.h>
//#include    "periph/stdc/std_c.h"

/*----------------*/
/* Standard types */
/*----------------*/
typedef unsigned int        u_int   ;
typedef unsigned short      u_short ;
typedef unsigned char       u_char  ;


#define		ARM_CODE		0
#define		THUMB_CODE		1

#define SDRAM_BASE 			 0x0
#define SDRAM_BASE_ADDR      0x20000000
#define SDRAM_SIZE           (64*1024*1024)						// 64Mbytes
#define SDRAMCPY_START 		 (SDRAM_BASE_ADDR + 0x00FC4000) 	// choosed to activate 
#define SDRAMCPY_STOP 		 (SDRAM_BASE_ADDR + 0x01055870) 	// all address bits

extern u_int ExecuteTest (u_int *address, u_int arm);

//*----------------------------------------------------------------------------
//* Function Name       : AT91F_SDRAM_Test
//* Object              : 
//*----------------------------------------------------------------------------
int AT91F_SDRAM_Test (void)
{
    u_int		*pmemcr;
    u_int 		code_length;
	u_int 		loop_count;

	pmemcr = (u_int *)SDRAMCPY_START; 
	loop_count = 0;
	
	do
	{	
		// Execute Thumb code
		code_length = ExecuteTest(pmemcr, THUMB_CODE);
		// Execute ARM code
		code_length = ExecuteTest(pmemcr, ARM_CODE);
		// Updating loop count
		loop_count ++;
		// Updating code load address
		pmemcr = (u_int *) ( (u_int)pmemcr + (u_int)code_length );
	}
	while ( (u_int)pmemcr < (u_int)SDRAMCPY_STOP );
//	while ( loop_count < 0xd7a /*( ( ( u_int )  SDRAMCPY_STOP - ( u_int ) SDRAMCPY_START  / code_length )*/) ;

    return 0;
}