ram_test.c

uboot底层驱动

#include "my_printf.h"

#define READ_REG(addr)  (*((volatile  char *)(addr)))
#define WRITE_REG(addr, data)  (*((volatile char *)(addr)) = (data))

#define READ_REGl(addr)  (*((volatile  int *)(addr)))
#define WRITE_REGl(addr, data)  (*((volatile int *)(addr)) = (data))

int ERR = 0;

int addr_test(int addr_base, int addr_end)
{
	int i = 0;
	for (; i<(addr_end-addr_base); i += 4)
		WRITE_REGl(addr_base+i, addr_base+i);
	for (i=0; i<(addr_end-addr_base); i += 4)
		if ( (addr_base + i) != READ_REGl(addr_base + i) )
		{
			my_printf("addr bus error\n\r");
			ERR = 1;
			return 1;
		}
	ERR = 0;
}
	

void sdram_test(int addr_base, int addr_end)
{
	int i = 0;
	ERR = 0;

	//do {
	for (; i<=addr_end-addr_base; )
	{
		WRITE_REG(addr_base+i, 0x55);
		WRITE_REG(addr_base+i+1, 0xaa);
		
		
		if ( READ_REG(addr_base+i) != 0x55 )
		{
			//if ( READ_REG(addr_base+i) == 0xff )
			//{
			//	addr_test(addr_base, i+1);
			//	if ( 1== ERR )
			//		return 1;
			//	my_printf("sdram 0x%x\r\n", i+1);	
			//	return 0;
			//}
			//else
				ERR = 1;
		}
		WRITE_REG(addr_base+i, 0xaa);
		WRITE_REG(addr_base+i+1, 0x55);
		if ( READ_REG(addr_base+i) != 0xaa )
			ERR = 1;
		if ( 1==ERR) 
		{
			my_printf("sdram or data bus error\r\n");
			//return 1;
		}
		//if ((i%(1024*1024)) == 0)
		// my_printf("i = %d\n\r", i/(1024*1024));
		i++;
	}
	addr_test(addr_base, addr_end);
	if ( ERR == 0)
	{
		my_printf("sdram test ok!\n\r");
	//	return 0;
	}
	
//		return 1;
	//} while (1);
}