U-boot用tftp命令直接烧写到NandFlash V3.0
/****************************************************
版本：v3.0
功能：给计数器做了清零，解决Retry count exceeded; starting again 的问题。发现的新问题，并解决了。现在可以把一个200多k的直接烧写到Nand中了。
不足：可以进一步考虑 Yaffs2文件系统的直接烧写。不过只会分析一下。
*****************************************************/
１、定义一块tftp_nand_buffer[2048]；
２、每次store_block调用的时候，首先从tftp_nand_buffer[(tftp_nand_counter & 1) << 10]开始拷贝数据；
３、nand_write_skip_bad(nand, off, &length, buffer);
nand_write_skip_bad:
nand :
off :写入flash的位置(off + ((tftp_nand_counter-1)*1024)) //里边的off为0.
length：数据长度，为2048
buffer: 数据位置 tftp_nand_buffer
解决tftp_nand_counter清零的问题，改动如下：
diff -ru 6Ubootnand/include/net.h 7UbootTftp/include/net.h
--- 6Ubootnand/include/net.h 2013-03-10 20:45:12.500500278 +0800
+++ 7UbootTftp/include/net.h 2013-03-15 13:33:42.959027263 +0800
@@ -54,7 +54,9 @@
#include <asm/byteorder.h> /* for nton* / ntoh* stuff */
-
+#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
+extern ulong tftp_nand_counter ;
+#endif
/*
* The number of receive packet buffers, and the required packet buffer
* alignment in memory.
diff -ru 6Ubootnand/common/cmd_net.c 7UbootTftp/common/cmd_net.c
--- 6Ubootnand/common/cmd_net.c 2013-03-10 20:45:12.432500274 +0800
+++ 7UbootTftp/common/cmd_net.c 2013-03-15 13:39:17.334305199 +0800
@@ -159,6 +159,11 @@
int size;
ulong addr;
+#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
+ tftp_nand_counter = 0;
+#endif
+ //add by kangear for tftp nand
+
/* pre-set load_addr */
if ((s = getenv("loadaddr")) != NULL) {
load_addr = 易做图_strtoul(s, NULL, 16);
解决Retry count exceeded; starting again 的问题，改动如下：
diff -ru 6Ubootnand/include/configs/smdk2440.h 7UbootTftp/include/configs/smdk2440.h
--- 6Ubootnand/include/configs/smdk2440.h
2013-03-15 14:27:48.982175390 +0800
+++ 7UbootTftp/include/configs/smdk2440.h
2013-03-15 12:29:45.197981641 +0800
@@ -59,7 +59,7 @@
//#define CONFIG_CS8900_BUS16
/* the Linux driver does accesses as shorts */
#define CONFIG_NET_MULTI
1
-#define CONFIG_NET_RETRY_COUNT 20
+#define CONFIG_NET_RETRY_COUNT 100 //20 kangear for tftp to nand
#define CONFIG_DRIVER_DM9000
1 /* we have a dm9000 on-board */
#define CONFIG_DM9000_BASE
0x20000000
#define DM9000_IO
CONFIG_DM9000_BASE
@@ -76,13 +76,11 @@
#define CONFIG_ASM_DEBUG 1
/* we use SERIAL 1 on SMDK2410 */
#define CONFIG_SKIP_LOWLEVEL_INIT 1
#define CONFIG_SKIP_RELOCATE_UBOOT 1
-
/*
- * boot size
+ * tftp 烧写到flash中
*/
-#define CONFIG_UBOOT_SIZE (CONFIG_ENV_ADDR-0)
-
-
+#define CONFIG_SYS_DIRECT_FLASH_TFTP 1
+#define CONFIG_TFTP_BLOCKSIZE 1024
算法的优化为这样的：
diff -ru 6Ubootnand/net/tftp.c 7UbootTftp/net/tftp.c
--- 6Ubootnand/net/tftp.c 2013-03-10 20:45:12.448500276 +0800
+++ 7UbootTftp/net/tftp.c 2013-03-15 14:13:35.915403248 +0800
@@ -9,6 +9,11 @@
#include <net.h>
#include "tftp.h"
#include "bootp.h"
+#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
+#include <nand.h>
+ulong tftp_nand_counter = 0;
+static u_char tftp_nand_buffer[2048];
+#endif
#if defined(CONFIG_CMD_NET)
@@ -131,7 +136,11 @@
ulong newsize = offset + len;
#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
int i, rc = 0;
-
+ int data_end_flag = 0;
+ nand_info_t *nand;
+ loff_t off = 0;
+ size_t length;
+ u_char *buffer;
for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; i++) {
/* start address in flash? */
if (flash_info[i].flash_id == FLASH_UNKNOWN)
@@ -142,19 +151,44 @@
}
}
- if (rc) { /* Flash is destination for this packet */
- rc = flash_write ((char *)src, (ulong)(load_addr+offset), len);
+ nand = &nand_info[nand_curr_device];
+ off = (tftp_nand_counter-1)*1024;
+ length = 2048;
+ memcpy((uchar *)(tftp_nand_buffer+((tftp_nand_counter & 1) << 10)), (uchar *)src, 1024);
+ //memcpy((uchar *)tftp_nand_buffer[(tftp_nand_counter & 1) << 10], (uchar *)src, 1024);
+ buffer = (u_char *)tftp_nand_buffer;
+ printf("\nlen = %d, tftp_nand_counter = %d", len, tftp_nand_counter);
+ if(len < 1024)
+ {
+ data_end_flag = 1; //不足1k的。
+ if (0 == tftp_nand_counter)
+ tftp_nand_counter = 1;
+ else if(0 == (tftp_nand_counter & 1)) //在偶数次正好结束的。
+ {
+ buffer = (u_char *)src;
+ off = tftp_nand_counter*1024;
+ }
+ }
+ if ( rc && ( data_end_flag || (0 != (tftp_nand_counter & 1))) ) { /* Flash is destination for this packet */
+ rc = nand_write_skip_bad(nand, off, &length, buffer);
+ //printf("\nhaha\n");
if (rc) {
flash_perror (rc);
NetState = NETLOOP_FAIL;
return;
}
+
}
else
#endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
{
(void)memcpy((void *)(load_addr + offset), src, len);
}
+
+#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
+ tftp_nand_counter ++;
+#endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
+
#ifdef CONFIG_MCAST_TFTP
if (Multicast)www.zzzyk.com
ext2_set_bit(block, Bitmap);
另外：烧写内核（4.XM）还是会出现：
len = 1024, tftp_nand_counter = 398
len = 1024, tftp_nand_counter = 399
Retry count exceeded; starting again
dm9000 i/o: 0x20000000, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 00:01:02:03:04:05
operating at 100M full duplex mode
Abort
SMDK2440 #
解决方法和上边的应该还是同样的，加大CONFIG_NET_RETRY_COUNT应该就能解决。
