WhyCan Forum(哇酷开发者社区)

#include <stdint.h>
#include <stdio.h>
#include <string.h>

extern void sys_uart_putc(char c);
extern void sys_uart_print(char *str);
extern void sys_spi_flash_init(void);
extern void sys_spi_flash_exit(void);

extern void sys_spi_flash_read(int addr, void * buf, int count);

static inline void sdelay(int loops)
{
	__asm__ __volatile__ ("1:\n" "subs %0, %1, #1\n"
		"bne 1b":"=r" (loops):"0"(loops));
}

int boot_main(int argc, char **argv) {
    void (*theKernel)(int zero, int arch, unsigned int params);
    void *sdram_dtb_start = (void  *)0x80030000;
    void *sdram_kernel_start = (void  *)0x80040000;


    /* 0. 从NOR FLASH里把dtb读入内存 */
    sys_uart_print("Copy dtb from nor\n\r");
    sys_spi_flash_init();
    volatile unsigned int spi_dtb_start=0x30000;
	sys_spi_flash_read( spi_dtb_start,sdram_kernel_start, 0x10000);
	sys_uart_print("Copy dtb from nor ok!\n\r");

    /* 1. 从NOR FLASH里把内核读入内存 */
    sys_uart_print("Copy kernel from nor\n\r");
    volatile unsigned int spi_kernel_start=0x40000;
	sys_spi_flash_read(spi_kernel_start, sdram_kernel_start, 0x260000);
	sys_uart_print("Copy kernel from nor ok!\n\r");
	sys_spi_flash_exit();


    /* 2. 设置参数 ，与内核约定参数存放地址，Uboot写个内核的遗嘱^^*/
    // puts("Set boot params\n\r");
    // setup_start_tag();
    // setup_memory_tags();
    // setup_commandline_tag("noinitrd root=/dev/mtdblock3 init=/linuxrc console=ttySAC0");
    // setup_end_tag();

    /* 3. 跳转执行 */
    sys_uart_print("Boot kernel\n\r");
    theKernel = (void (*)(int, int, unsigned int))0x80040000;
    theKernel(0, 0, 0x80030000);  //362:arm 
    /* 
     *  mov r0, #0
     *  ldr r1, =362
     *  ldr r2, =0x30000100
     *  mov pc, #0x30008000 
     */

    sys_uart_print("Error!\n\r");
    /* 如果一切正常, 不会执行到这里 */

    return 0;
}