main.c

spi_boot_example.tar.gz可以为大家在使用 Cirrus logic的ARM9芯片是提供帮助

/*==================================================================
 *
 *  This file is part of a small Nand flash bootloader designed to
 *  be loaded via EP93xx SPI boot.
 *
 *  Copyright Cirrus Logic Corporation, 2007.  All rights reserved
 *
 ==================================================================*/

#include <io.h>
#include <boot.h>


#define COUNT_OF_BYTES_TO_COPY 16384

const u32 pattern1=0x12345678;
const u32 pattern2=0x87654321;
const u32 pattern3=0xabcdef12;
const u32 pattern4=0x12abcdef;


int check_sdram(int sdram_base)
{
    volatile u32 *sdram;
    int fail=0;

    sdram = (u32 *) sdram_base;
    
    sdram[0]=pattern1;
    sdram[1]=pattern2;
    sdram[2]=pattern3;
    sdram[3]=pattern4;

    if(sdram[0]!=pattern1)
    {
	fail++;
    }
    if(sdram[1]!=pattern2)
    {
	fail++;
    }
    if(sdram[2]!=pattern3)
    {
	fail++;
    }
    if(sdram[3]!=pattern4)
    {
	fail++;
    }
	
    return fail;
}


extern void set_sp(u32 sp);
extern u32 get_pc(void);


void sdram_setup_and_scan(void)
{    
// devcfg value for 32bit: 0x00210028 sdram_cmd 0x00008800 , for 16bit: 0x0021002c sdram_cmd 0x00004600
    //32 bit setup:

    puts("SDRAM");

    sdram_setup( SDRAM_LOCATION, 0x00210028, 0x00008800 , 0);


    if( check_sdram(SDRAM_LOCATION) )
    {
    //16 bit setup:
	sdram_setup( SDRAM_LOCATION, 0x0021002c, 0x00004600 , 0);
	if( check_sdram(SDRAM_LOCATION) )
	{
	    puts("Fail");
	    while(1);
	}
	else
	    puts("16 OK\r\n");
    }
    else
	puts("32 OK\r\n");

}


u32 read_spi_word(u32 adr);
    
void start_C(u32 bootmode)
{	
    int i;
    u32 dat;
    u32 *sdram=(u32 *) SDRAM_LOAD_ADDRESS;
    
    sdram_setup_and_scan();

    for(i=0; i<COUNT_OF_BYTES_TO_COPY; i+=4)
    {
	dat = read_spi_word(i+0x804);
	sdram[i>>2]=dat;
    }

    puts("exe");
    set_pc((u32) sdram);

    while(1)
    {
    }
}