// uart->UMCON = 0x1; /* RTS up */

s3c2440_set_baudrate(baudrate, index);

return (0);

}

设置波特率函数s3c2440_set_baudrate()

void s3c2440_set_baudrate(unsigned int baudrate, int index)

{

struct s3c2440_uart *uart = s3c2440_get_base_uart(index);

unsigned int reg = 0;

int i;

reg = s3c2440_get_pclk() / (16 * baudrate) - 1;

uart->UBRDIV = reg;

for (i = 0; i < 100; i++);

}

返回到bootstrap_main()函数中去，看下printf()函数如何将打印信息通过串口显示出来。

#define CFG_PBSIZE 1024 /* Print Buffer Size */

void printf(const char *fmt, ...)

{

va_list args;

uint i;

char printbuffer[CFG_PBSIZE];

va_start(args, fmt);

/* For this to work, printbuffer must be larger than

* anything we ever want to print.

*/

i = vsprintf(printbuffer, fmt, args);

va_end(args);

console_serial_puts(printbuffer);

}

调用函数console_serial_puts()函数，如下：

#define console_serial_puts(s) s3c2440_serial_puts(s, CONSOLE_SERIAL)

void s3c2440_serial_puts(const char *s, int index)

{

while (*s)

{

if (*s == '\n') /* If \n, also do \r */

s3c2440_serial_putc('\r', index);

s3c2440_serial_putc (*s++, index);

}

}

调用函数s3c2440_serial_putc()函数，如下：

/*

* Output a single byte to the serial port.

*/

void s3c2440_serial_putc (char c, int index)

{

struct s3c2440_uart *uart = s3c2440_get_base_uart(index);

/* wait for room in the tx FIFO */

//while ((!(uart->UTRSTAT & 0x2)));

while (uart->UFSTAT & (1<<14));

uart->UTXH = c;

}

返回bootstrap_main()函数，调用mem_mallloc_init()函数初始化动态分配的存储区，为我们调用malloc()函数做好准备工作，如下：

void mem_malloc_init(ulong start, ulong size)

{

mem_malloc_start = start;

mem_malloc_end = start + size;

mem_malloc_brk = start;



memset((void *)mem_malloc_start, 0, size);

printf("malloc memory space: 0x%lx~0x%lx\n", start, start+size);

}

函数返回，调用函数

ptr = (char *)malloc(MALLOC_SIZE);

其中MALLOC_SIZE定义在makefile函数，MALLOC_SIZE=0x100000。我们深入到malloc函数中去，如下

声明位置：yaffs2/common/malloc.h

#define mALLOc malloc

Void_t* mALLOc(size_t);

定义位置：yaffs2/common/dlmalloc.c

代码量很大，不拷贝了。

返回bootstrap_main()函数，调用如下函数目的是测试动态分配到存储区域是否成功：

strncpy(ptr, "Hello World!\n", MALLOC_SIZE);

printf("Malloc address: %p, string: %s\n", ptr, ptr);

free(ptr);

接着就到了测试yaffs2文件系统的阶段了。

#define YAFFSFS_MNT_POINT "/nand"

yaffs_test(YAFFSFS_MNT_POINT);

hang:

while(1)

;

return 0;

}

其中yaffs_test()函数主要是通过创建文件或目录，并删除一些文件的功能来达到测试yaffs2文件系统是否移植成功，代码如下：

位置：与bootstrap_main（）函数同处于一个位置。

void yaffs_test(const char *mountpt)

{

yaffs_start_up();

yaffs_format(mountpt,0,0,0);

yaffs_mount(mountpt);

printf("'%s' mounted\n", mountpt);

mkdir(mountpt, "foo");

mkfile(mountpt, "foo/f1");

mkfile(mountpt, "foo/f2");

mkfile(mountpt, "foo/f3");

mkfile(mountpt, "foo/f4");

mkdir(mountpt, "bar");

mkfile(mountpt, "bar/f1");

ls(mountpt, NULL);

rm(mountpt, "foo/f4");

rm(mountpt, "bar");

ls(mountpt, NULL);