s3c2416解决无法下载大于60M文件系统

川长思鸟来 2022-09-18 12:54 167阅读 0赞

硬件配制内存64M，nandflash 128M,我的u-boot版本为1.3.4

由于内存太小，无法下载大于60M的文件系统，我这里说下如何从TF更新大于60M的文件系统。

首先从TF卡 启动更新系统你需要移植fat,mmc相关支持，这里我已经移植好了具体过程我就不说了.这些移植完成后。

最开始是可以使用如下命令进行更新的:

fatload mmc 0 0xc0000000 /gzsd/u-boot.bin; nand erase bios; nand write.jffs2 0xc0000000 bios $(filesize)

bios为u-boot分区信息。60M文件之所以无法下载是因为内存不够引起的，所以首先要找到读文件是在哪里，跟踪代码最后找到fat.c文件。

在函数get\_contents中有这样几条代码:

/* get remaining clusters */
    		if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
    			FAT_ERROR("Error reading cluster\n");
    			return -1;
    		}
    		/* get remaining bytes */
    		gotsize += (int)actsize;
    		filesize -= actsize;
    		buffer += actsize;
    		actsize= filesize;
    		if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
    			FAT_ERROR("Error reading cluster\n");
    			return -1;
    		}

具体读的过程就是在get\_cluster函数里

static int
    get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
    {
    	int idx = 0;
    	__u32 startsect;
    
    	if (clustnum > 0) {
    		startsect = mydata->data_begin + clustnum*mydata->clust_size;
    	} else {
    		startsect = mydata->rootdir_sect;
    	}
    
    	FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
    	if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) {
    		FAT_DPRINT("Error reading data\n");
    		return -1;
    	}
    	if(size % FS_BLOCK_SIZE) {
    		__u8 tmpbuf[FS_BLOCK_SIZE];
    		idx= size/FS_BLOCK_SIZE;
    		if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
    			FAT_DPRINT("Error reading data\n");
    			return -1;
    		}
    		buffer += idx*FS_BLOCK_SIZE;
    
    		memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE);
    		return 0;
    	}
    
    	return 0;
    }

接下来我主要对这两个函数进行修改，我的实现过程是将文件系统分次读写，先读20几M然后开始写到flash里，然后在读20几M写到flash里，反复这样的操作.

首先在文件前面增加向个全局变量和宏定义

#define BUF_SIZE	(2112*1024*10)
    #define B_ADDR	0x0
    #define K_ADDR	0x300000
    #define R_ADDR	0x700000
    static long nandaddr=0;
    static long memaddr=0xc0000000;
    static int wnandflags = 0;

其中BUF\_SIZE为每次读写的字节，有一点需要注意这里的大小不是可以任意修改。在写yaffs文件的时候有一个大小的判断。具体请看u-boot源码下的drivers/mtd/nand/nand\_util.c

函数:

int nand\_write\_skip\_bad\_yaffs里面有如下代码:

if (*length % (nand->writesize + nand->oobsize)) {
    			*length = (*length / (nand->writesize + nand->oobsize)+1)*(nand->writesize + nand->oobsize);
    	}

length为你写的文件的大小,而其中

nand->writesize + nand->oobsize

就是2112字节

同时BUF\_SIZE还必需满足以下两个条件：

1.必需是512的倍数，因为TF卡里一个扇区是512字节，如果不是512字节可能导致数据最后加起来不对

2.必需是2\*1024的倍数，yaffs文件好像不需要满足这个，这个只针对u-boot和内核，因为nandflash是以2K对齐的，如果内核大于BUF\_SIZE了这个就需要用到了。

B\_ADDR u-boot在nand flash里的起始地址 K\_ADDR内核在nand flash里的起始地址 R\_ADDR为文件系统在nand flash里的起始地址.

这两个函数修改后如下：

static int
    gzsd_get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
    {
    	int idx = 0;
    	__u32 startsect;
    	char cmd_buf[200];
    	unsigned long wsize;
    	unsigned long tmpmem,tmpnand;
    	int times,i,tmpsize;
    	__u8 *dmem=(unsigned char *)0xc0000000;
    	if (clustnum > 0) {
    		startsect = mydata->data_begin + clustnum*mydata->clust_size;
    	} else {
    		startsect = mydata->rootdir_sect;
    	}
    
    	FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
    
    	if(size > BUF_SIZE) {
    		times = size / BUF_SIZE;
    		tmpmem = memaddr;
    		tmpnand = nandaddr;
    		tmpsize = BUF_SIZE;
    		for(i=0;i<times;i++) {
    			if (disk_read(startsect, tmpsize/FS_BLOCK_SIZE , dmem) < 0) {
    				FAT_DPRINT("Error reading data\n");
    				return -1;
    			}
    			if(tmpsize % FS_BLOCK_SIZE)
    				printf("*****************************\n");
    			if(wnandflags) {
    				sprintf(cmd_buf, "nand write.yaffs 0x%x 0x%x 0x%x", tmpmem, tmpnand, tmpsize);
    				printf("nand write.yaffs 0x%x 0x%x 0x%x", tmpmem, tmpnand, tmpsize);
    				run_command(cmd_buf, 0);
    			}
    			else {
    				sprintf(cmd_buf, "nand write.jffs2 0x%x 0x%x 0x%x", tmpmem, tmpnand, tmpsize);
    				printf("nand write.jffs2 0x%x 0x%x 0x%x", tmpmem, tmpnand, tmpsize);
    				run_command(cmd_buf, 0);
    			}
    			//buffer += BUF_SIZE;
    			startsect += tmpsize/FS_BLOCK_SIZE;
    			//tmpmem += tmpsize;
    			tmpnand += tmpsize;
    		}
    		if(size % BUF_SIZE) {
    			tmpsize = size % BUF_SIZE;
    			if (disk_read(startsect, tmpsize/FS_BLOCK_SIZE , dmem) < 0) {
    				FAT_DPRINT("Error reading data\n");
    				return -1;
    			}
    			if(tmpsize % FS_BLOCK_SIZE) {
    				__u8 tmpbuf[FS_BLOCK_SIZE];
    				idx= tmpsize/FS_BLOCK_SIZE;
    				if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
    					FAT_DPRINT("Error reading data\n");
    					return -1;
    				}
    				dmem += idx*FS_BLOCK_SIZE;
    				memcpy(dmem, tmpbuf, tmpsize % FS_BLOCK_SIZE);
    			}
    			if(wnandflags) {
    				wsize = tmpsize;
    				sprintf(cmd_buf, "nand write.yaffs 0x%x 0x%x 0x%x", tmpmem, tmpnand, wsize);
    				printf("nand write.yaffs 0x%x 0x%x 0x%x", tmpmem, tmpnand, wsize);
    				run_command(cmd_buf, 0);
    			}
    			else {
    				if(tmpsize % (2*1024) != 0)
    					wsize = ((tmpsize/(2*1024)) + 1)*(2*1024);
    				else
    					wsize = tmpsize;
    				sprintf(cmd_buf, "nand write.jffs2 0x%x 0x%x 0x%x", tmpmem, tmpnand, wsize);
    				printf("nand write.jffs2 0x%x 0x%x 0x%x", tmpmem, tmpnand, wsize);
    				run_command(cmd_buf, 0);
    			}
    		}
    	}
    	else { // < BUF_SIZE
    		if (disk_read(startsect, size/FS_BLOCK_SIZE , dmem) < 0) {
    			FAT_DPRINT("Error reading data\n");
    			return -1;
    		}
    
    		if(size % FS_BLOCK_SIZE) {
    			__u8 tmpbuf[FS_BLOCK_SIZE];
    			idx= size/FS_BLOCK_SIZE;
    			if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
    				FAT_DPRINT("Error reading data\n");
    				return -1;
    			}
    			dmem += idx*FS_BLOCK_SIZE;
    			memcpy(dmem, tmpbuf, size % FS_BLOCK_SIZE);
    		}
    		if(wnandflags) {
    			wsize = size;
    			sprintf(cmd_buf, "nand write.yaffs 0x%x 0x%x 0x%x", memaddr, nandaddr, wsize);
    			printf("nand write.yaffs 0x%x 0x%x 0x%x", memaddr, nandaddr, wsize);
    			run_command(cmd_buf, 0);
    		}
    		else {
    			if(size % (2*1024) != 0)
    				wsize = ((size/(2*1024)) + 1)*(2*1024);
    			else
    				wsize = size;
    			sprintf(cmd_buf, "nand write.jffs2 0x%x 0x%x 0x%x", memaddr, nandaddr, wsize);
    			printf("nand write.jffs2 0x%x 0x%x 0x%x", memaddr, nandaddr, wsize);
    			run_command(cmd_buf, 0);
    		}
    	}
    	return 0;
    }
    
    /*
     * Read at most 'maxsize' bytes from the file associated with 'dentptr'
     * into 'buffer'.
     * Return the number of bytes read or -1 on fatal errors.
     */
    static long
    get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
    	     unsigned long maxsize)
    {
    	unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
    	unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE;
    	__u32 curclust = START(dentptr);
    	__u32 endclust, newclust;
    	unsigned long actsize;
    
    	FAT_DPRINT("Filesize: %ld bytes\n", filesize);
    
    	if (maxsize > 0 && filesize > maxsize) filesize = maxsize;
    
    	FAT_DPRINT("Reading: %ld bytes\n", filesize);
    	printf("Reading: %ld bytes\n", filesize);
    	if(filesize < (1*1024*1024)) {
    		nandaddr = B_ADDR;
    		wnandflags = 0;
    	}
    	else if((filesize > (1*1024*1024)) && (filesize < (10*1024*1024))) {
    		nandaddr = K_ADDR;
    		wnandflags = 0;
    	}
    	else if(filesize > (10*1024*1024)) {
    		nandaddr = R_ADDR;
    		wnandflags = 1;
    	}
    	memaddr = 0xc0000000;
    	actsize=bytesperclust;
    	endclust=curclust;
    	do {
    		/* search for consecutive clusters */
    		while(actsize < filesize) {
    			newclust = get_fatent(mydata, endclust);
    			if((newclust -1)!=endclust)
    				goto getit;
    			if (CHECK_CLUST(newclust, mydata->fatsize)) {
    				FAT_DPRINT("curclust: 0x%x\n", newclust);
    				FAT_DPRINT("Invalid FAT entry\n");
    				return gotsize;
    			}
    			endclust=newclust;
    			actsize+= bytesperclust;
    		}
    		/* actsize >= file size */
    		actsize -= bytesperclust;
    #if 1
    #if 0
    		/* get remaining clusters */
    		if (gzsd_get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
    			FAT_ERROR("Error reading cluster\n");
    			return -1;
    		}
    		/* get remaining bytes */
    		gotsize += (int)actsize;
    		filesize -= actsize;
    		//buffer += actsize;
    		nandaddr += actsize;
    		//memaddr += actsize;
    		actsize= filesize;
    		if (gzsd_get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
    			FAT_ERROR("Error reading cluster\n");
    			return -1;
    		}
    #else
    		/* get remaining clusters */
    		if (gzsd_get_cluster(mydata, curclust, buffer, filesize) != 0) {
    			FAT_ERROR("Error reading cluster\n");
    			return -1;
    		}
    #endif
    #else
    		/* get remaining clusters */
    		if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
    			FAT_ERROR("Error reading cluster\n");
    			return -1;
    		}
    		/* get remaining bytes */
    		gotsize += (int)actsize;
    		filesize -= actsize;
    		buffer += actsize;
    		actsize= filesize;
    		if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
    			FAT_ERROR("Error reading cluster\n");
    			return -1;
    		}
    #endif
    		gotsize+=actsize;
    		return gotsize;
    getit:
    		if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
    			FAT_ERROR("Error reading cluster\n");
    			return -1;
    		}
    		gotsize += (int)actsize;
    		filesize -= actsize;
    		buffer += actsize;
    		curclust = get_fatent(mydata, endclust);
    		if (CHECK_CLUST(curclust, mydata->fatsize)) {
    			FAT_DPRINT("curclust: 0x%x\n", curclust);
    			FAT_ERROR("Invalid FAT entry\n");
    			return gotsize;
    		}
    		actsize=bytesperclust;
    		endclust=curclust;
    	} while (1);
    }

get\_cluster不作修改，因为还有一个地方需要用到，这里新增加一个gzsd\_get\_cluster函数，将nand的写操作也增加进去了，现在只需要执行:

fatload mmc 0 0xc0000000 /gzsd/root.bin就可以完成烧写.