Chinaunix
标题:
关于重定位的问题
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作者:
一笑fcl
时间:
2014-11-25 18:34
标题:
关于重定位的问题
static int nandll_read_page (unsigned char *buf, unsigned long addr, int large_block)
{
int i;
int page_size = 512;
if (large_block==2)
page_size = 4096;
nand_select();
NFCMMD = 0;
/* Write Address */
NFADDR = 0;
if (large_block)
NFADDR = 0;
NFADDR = (addr) & 0xff;
NFADDR = (addr >>
& 0xff;
NFADDR = (addr >> 16) & 0xff;
if (large_block)
NFCMMD = 0x30;
wait_ready();
for(i=0; i < page_size; i++) {
*buf++ = NFDATA;
}
nand_deselect();
return 0;
}
int copy2ddr(unsigned int nand_start, unsigned int ddr_start, unsigned int len)
{
unsigned char *dest = (unsigned char *)ddr_start;
unsigned int free_page = 0;
int i;
if(len > 8192)
{
free_page = ((len - 8192)+4096) >> 12;
}
/* 初始化nand flash controller */
nand_init();
/* 读nand flash */
/* Read pages */
for (i = 0; i < 4; i++, dest+=204
{
nandll_read_page(dest, i, 2);
}
/* Read pages */
for (i = 4; i < (free_page+4); i++, dest+=8192) {
nandll_read_page(dest, i, 2);
}
return 0;
}
nandll_read_page(dest, i, 2);这个函数传递的地址参数i感觉有点奇怪？还有copy2ddr（）中为什么分两次移动数据呢？求大神帮忙解决（这个是韦东山视频里的代码）
作者:
xshenpan
时间:
2014-12-01 14:21
本帖最后由 xshenpan 于 2014-12-01 14:22 编辑
你可以参看这个博客http:// blog . csdn . net/girlkoo/article/details/8115849
没权限发链接，去掉空格再访问
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& 0xff;