u-boot-2011.03在TQ2440上的移植(3)--支持norflash启动 .

转自:http://blog.csdn.net/it_114/article/details/6264897

1、修改命令提示符为自己的

vi include/configs/smdk2440.h

第118行修改为

#define CONFIG_SYS_PROMPT?? "[SMDK2440]#"? //将命令行前的名字改成[SMDK2440]

2、通常，在嵌入式bootloader中，有两种方式来引导启动内核：从Nor Flash启动和从Nand Flash启动。u-boot中默认是从Nor Flash启动的。

3、TQ2440的所用的Norflash为EN29LV160AB。接线同AM29LV160DB

翻开此芯片的datasheet看到

TQ2440原理图上的第47脚 BYTE#是接高电平的，so 此芯片工作于16位模式(半字模式)
A0-A19是地址线，在半字模式下，D0-D15做为数据输入输出口。因为数据位是16位，A0-A19可以选择2^20 = 1M *2BYTE = 2Mbyte。正好是AM29LV160DB的容量。S3C2440的ADDR1要接AM29LV160DB的A0。上图中AM29LV160DB的A20,A21是空脚，分别接的是LADDR21,LADDR22。这应该是为了以后方便扩展NOR FLASH的容量。LADDR21,LADDR22对AM29LV160DB是没用的。

<1>2048K * 8bit / 1024K * 16bit Flash Memory Boot Sector Flash Memory

<2>Flexible Sector Architecture:

-One 16-Kbyte,two 8-Kbyte,one 32-Kbyte,and thirty-one 64-Kbyte sectors(byte mode)

-One 8-Kword, two 4-Kword,one 16-Kword,and thirty-one 32-Kword sectors(word mode)

无论哪种模式总扇区是 35 sectors。

4、修改Norflash参数

vi include/configs/smdk2440.h

/*-----------------------------------------------------------------------
?* FLASH and environment organization
?*/
#if 0??? //注释掉下面两个类型的Nor Flash设置，因为不是我们所使用的型号
#define CONFIG_AMD_LV400???? 1 /* uncomment this if you have a LV400 flash */
#define CONFIG_AMD_LV800???? 1 /* uncomment this if you have a LV800 flash */
#endif

#define CONFIG_SYS_MAX_FLASH_BANKS 1? /* max number of memory banks */

#ifdef CONFIG_AMD_LV800
#define PHYS_FLASH_SIZE??????????? 0x00100000? /* 1MB */
#define CONFIG_SYS_MAX_FLASH_SECT? (19)??????? /* max number of sectors on one chip */
#define CONFIG_ENV_ADDR??????????? (CONFIG_SYS_FLASH_BASE + 0x0F0000) /* addr of environment */
#endif
#ifdef CONFIG_AMD_LV400
#define PHYS_FLASH_SIZE??????????? 0x00080000? /* 512KB */
#define CONFIG_SYS_MAX_FLASH_SECT? (11)??????? /* max number of sectors on one chip */
#define CONFIG_ENV_ADDR??????????? (CONFIG_SYS_FLASH_BASE + 0x070000) /* addr of environment */
#endif

//第175行添加如下内容

#define CONFIG_EON_29LV160AB???? 1??????? //添加TQ2440开发板Nor Flash设置
#define PHYS_FLASH_SIZE??????????? 0x200000 //我们开发板的Nor Flash是2M
#define CONFIG_SYS_MAX_FLASH_SECT? (35)???? //根据EN29LV160AB的芯片手册描述，共35个扇区
#define CONFIG_ENV_ADDR??????????? (CONFIG_SYS_FLASH_BASE + 0x80000) //暂设置环境变量的首地址为0x80000 //在256K处放uboot参数

5、添加Norflash的information

vi include/flash.h

?

第181行添加

?

#define EON_ID_LV160AB?? 0x22492249

6、修改norflash的驱动，在u-boot中对Nor Flash的操作分别有初始化、擦除和写入，所以我们主要修改与硬件密切相关的三个函数flash_init、flash_erase、write_hword。

vi board/samsung/smdk2440/flash.c

由-One 8-Kword,two 4-Kword,one 16-Kword,and thirty-one 32-Kword sectors(word mode)

可知主要扇区大小为32k，so修改第31行

#define MAIN_SECT_SIZE???? 0x8000? //定义为32k，主要扇区的大小

#define MEM_FLASH_ADDR1? (*(volatile u16 *)(CONFIG_SYS_FLASH_BASE + (0x00000555 << 1)))
#define MEM_FLASH_ADDR2? (*(volatile u16 *)(CONFIG_SYS_FLASH_BASE + (0x000002AA << 1)))

由于我们是把norflash连接到了s3c2440的bank0上，因此norflash中的地址相对于s3c2440来说基址为0x00000000，即CONFIG_SYS_FLASH_BASE? = 0。
而之所以又把norflash中的地址向左移一位（即乘以2），是因为我们是把s3c2440的ADDR1连接到了norflash的A0上的缘故。

由数据手册可知EN29LV160AB第0扇区大小为8K，第1、2为4K，第3为16K，后面31扇区为32K。前面4个扇区加起来刚好是主要扇区的大小 = 32K,所以修改87行下如下

for (j = 0; j < flash_info[i].sector_count; j++)
{
??? if (j <= 3)
?? {
??????? /* 1st one is 8 KB */
?????? if (j == 0)
????? {
???????????? flash_info[i].start[j] = flashbase + 0;
????? }

????? /* 2nd and 3rd are both 4 KB */
????? if ((j == 1) || (j == 2))
??? ?{
?????????? flash_info[i].start[j] = flashbase + 0x2000 + (j - 1) * 0x1000;
?????}

???? /* 4th?16 KB */
???? if (j == 3)
?? ?{
?????????? flash_info[i].start[j] = flashbase + 0x4000;
??? ?}
?}
?else
?{
????? ?flash_info[i].start[j] = flashbase + (j - 3) * MAIN_SECT_SIZE;
?}
}
size += flash_info[i].size;

?

修改flash_print_info，添加EN29LV160AB相关信息如下：

switch (info->flash_id & FLASH_VENDMASK) {
?case (AMD_MANUFACT & FLASH_VENDMASK):
??printf ("AMD: ");
??break;
?case (EON_MANUFACT & FLASH_VENDMASK):
??printf ("EON: ");
??break;
?default:
??printf ("Unknown Vendor ");
??break;
?}

?switch (info->flash_id & FLASH_TYPEMASK) {
?case (AMD_ID_LV400B & FLASH_TYPEMASK):
??printf ("1x Amd29LV400BB (4Mbit)/n");
??break;
?case (AMD_ID_LV800B & FLASH_TYPEMASK):
??printf ("1x Amd29LV800BB (8Mbit)/n");
??break;
?case (EON_ID_LV160AB & FLASH_TYPEMASK):
??printf ("1x EN29LV160AB (16Mbit)/n");
??break;

?default:
??printf ("Unknown Chip Type/n");
??goto Done;
??break;
?}

修改int flash_erase (flash_info_t * info,int s_first,int s_last)

if ((info->flash_id & FLASH_VENDMASK) !=
???? (EON_MANUFACT & FLASH_VENDMASK)) {
??return ERR_UNKNOWN_FLASH_VENDOR;

7、至此，uboot关于Norflash已经移植好

make distclean

make smdk2440_config

make即可生成u-boot.bin

下载到板子的Norflash，在命令台输入saveenv即可

[SMDK2440]# saveenv

Saving Environment to Flash...

Un-Protected 2 sectors

Erasing Flash...Erasing sector 19 ... ok.

Erasing sector 20 ... ok.

Erased 2 sectors

Writing to Flash... done

Protected 2 sectors

[SMDK2440]# flinfo

Bank # 1: EON: 1x EN29LV160AB (16Mbit)

? Size: 2 MB in 35 Sectors

? Sector Start Addresses:

??? 00000000 (RO) 00002000 (RO) 00003000 (RO) 00004000 (RO) 00008000 (RO)

??? 00010000 (RO) 00018000 (RO) 00020000????? 00028000????? 00030000????

??? 00038000????? 00040000????? 00048000????? 00050000????? 00058000????

??? 00060000????? 00068000????? 00070000????? 00078000????? 00080000????

??? 00088000????? 00090000????? 00098000????? 000A0000????? 000A8000????

??? 000B0000????? 000B8000????? 000C0000????? 000C8000????? 000D0000????

??? 000D8000????? 000E0000????? 000E8000????? 000F0000????? 000F8000????

[SMDK2440]#

/*