uboot1.1.6之NOR FLASH 出现的问题解决方法
U-BOOT移植，structure has no member named `CAMDIVN
speed.c: In function `get_HCLK':
speed.c:114: error: structure has no member named `CAMDIVN'
speed.c: In function `get_PCLK':
speed.c:154: error: structure has no member named `CAMDIVN'
make[1]: *** [speed.o] Error 1
make[1]: Leaving directory `/usr/wuxuezhi/u-boot-1.1.6/cpu/arm920t/s3c24x0'
make: *** [cpu/arm920t/s3c24x0/libs3c24x0.a] Error 2
在include下的s3c24x0.h上的clock&power结构中添加相应名为CAMDIVN的结构变量
参考《嵌入式linux完全开发流程》P273，
(1)在include/configs/sbc2410x.h中添加#define CFG_FLASH_CFI_DRIVER 1
(2)在board/sbc2410x/Makefile中去掉flash.o
COBJS :=sbc2410x.o flash.o改为COBJS :=sbc2410x.o
(3)make测试，出错如下：编译出现很多警告，好像是编译器的问题，这里先不管它了啦,O(∩_∩)O哈哈~
[alu@localhost u-boot-1.1.6]$ make sbc2410x_config
Configuring for sbc2410x board...
[alu@localhost u-boot-1.1.6]$ make
.......
./bmp_logo logos/denx.bmp >/home/alu/mywork/systems/u-boot-1.1.6/include/bmp_logo.h
make[1]: Leaving directory `/home/alu/mywork/systems/u-boot-1.1.6/tools'
make -C examples all
make[1]: Entering directory `/home/alu/mywork/systems/u-boot-1.1.6/examples'
/usr/local/arm/usr/bin/arm-ep9312-linux-gnueabi-gcc -g -Os -fno-strict-aliasing -fno-common -ffixed-r8 -msoft-float -D__KERNEL__ -DTEXT_BASE=0x33F80000 -I/home/alu/mywork/systems/u-boot-1.1.6/include -fno-builtin -ffreestanding -nostdinc -isystem /usr/local/arm/usr/bin/../lib/gcc/arm-ep9312-linux-gnueabi/4.1.1/include -pipe -DCONFIG_ARM -D__ARM__ -march=armv4 -mabi=apcs-gnu -Wall -Wstrict-prototypes -c -o hello_world.o hello_world.c
hello_world.c:1: warning: target CPU does not support interworking
In file included from /home/alu/mywork/systems/u-boot-1.1.6/include/common.h:105,
from hello_world.c:24:
/home/alu/mywork/systems/u-boot-1.1.6/include/flash.h:36: error: 'CFG_MAX_FLASH_SECT' undeclared here (not in a function)
make[1]: *** [hello_world.o] Error 1
make[1]: Leaving directory `/home/alu/mywork/systems/u-boot-1.1.6/examples'
make: *** [examples] Error 2
[alu@localhost u-boot-1.1.6]$
上边有很多编译警告，先不管，看下边的错误可知，此错误是由未定义'CFG_MAX_FLASH_SECT' 而引起。呵呵是问了好多大侠才知道的。在include/configs/sbc2410x.h中添加'CFG_MAX_FLASH_SECT'的定义，暂时定义为#define CFG_MAX_FLASH_SECT 1 好像说这里应该根据flash 的data sheet来定义，但是我还不知道怎么定义，先不管了。定义后编译：
添加了'CFG_MAX_FLASH_SECT'的定义后编译，出现了好一堆的错误：
cfi_flash.c:1224: error: 'flash_info_t' has no member named 'cmd_reset'
cfi_flash.c: In function 'flash_write_cfiword':
cfi_flash.c:1257: error: 'flash_info_t' has no member named 'portwidth'
cfi_flash.c:1279: error: 'flash_info_t' has no member named 'vendor'
cfi_flash.c:1288: error: 'flash_info_t' has no member named 'portwidth'
cfi_flash.c:1292: error: 'flash_info_t' has no member named 'portwidth'
cfi_flash.c:1312: error: 'flash_info_t' has no member named 'write_tout'
cfi_flash.c: In function 'flash_make_addr':
cfi_flash.c:221: warning: control reaches end of non-void function
make[1]: *** [cfi_flash.o] Error 1
make[1]: Leaving directory `/home/alu/mywork/systems/u-boot-1.1.6/drivers'
make: *** [drivers/libdrivers.a] Error 2
[alu@localhost u-boot-1.1.6]$
分析：在include/flash.h中：
typedef struct {
ulong size;
ushort sector_count;
ulong flash_id;
ulong start[CFG_MAX_FLASH_SECT];
uchar protect[CFG_MAX_FLASH_SECT];
#ifdef CFG_FLASH_CFI
uchar portwidth;
uchar chipwidth;
……
“cfi_flash.c:220: error: structure has no member named `portwidth'”这个错误的意思是：
结构中没有portwidth，从flash_info_t结构的定义就可以知道，是CFG_FLASH_CFI没有定义。
所以，在include/configs/100ask24x0.h 中加一个#define CFG_FLASH_CFI 1
（4）添加#define CFG_FLASH_CFI 1再编译，又出现错误：
cfi_flash.c: In function `flash_init':
cfi_flash.c:411: error: `CFG_MONITOR_BASE' undeclared (first use in this function)
cfi_flash.c:411: error: (Each undeclared identifier is reported only once
cfi_flash.c:411: error: for each function it appears in.)
make[1]: *** [cfi_flash.o] 错误 1
make[1]:正在离开目录 `/home/boy/document/system/ub/u-boot-1.1.6/drivers'
make: *** [drivers/libdrivers.a] 错误 2
查找问题 在flash.h 和 100ask24x0.h中都没有定义CFG_MONITOR_BASE,又看了cfi_flash.c中的207：ulong flash_get_size (ulong base, int banknum);
208：#if defined(CFG_ENV_IS_IN_FLASH) || defined(CFG_ENV_ADDR_REDUND) || (CFG_MONITOR_BASE >= CFG_FLASH_BASE)
在100ask24x0.h定义：#define CFG_MONITOR_BASE 0x00000000 在编译：
（5）编译时，应该还会出现一个错误，我的是这样的，但是别人的没有出现。会要求定义#define CFG_ENV_ADDR (CFG_FLASH_BASE + 0X0F0000)这个地址我也不知道怎么定义，是对着LV800的定义的，还不知道是对是错呢！
（6）终于编译通过了！一共在sbc2410x.h中添加了
#define CFG_FLASH_CFI_DRIVER 1
#define CFG_MAX_FLASH_SECT 1
#define CFG_FLASH_CFI 1
#define CFG_MONITOR_BASE 0x00000000
#define CFG_ENV_ADDR (CFG_FLASH_BASE + 0X0F0000) 这几个定义。
（7）终于可以下到板子上边去跑了，虽然显示还是有问题
U-Boot 1.1.6 (Oct 29 2008 - 14:15:28)
DRAM: 64 MB
Flash: 0 kB ？？？？？？？flash显示有问题
*** Warning - bad CRC, using default environment
In: serial
Out: serial
小知识：
1）用fl可以显示内存
SMDK2410 # fl
Bank # 1: AMD: 1x Amd29LV400BB (4Mbit) （此为未修改nor flash之前的设置）
Size: 0 MB in 11 Sectors
Sector Start Addresses:
00000000 (RO) 00004000 (RO) 00006000 (RO) 00008000 (RO) 00010000 (RO)
00020000 00030000 00040000 00050000 00060000
00070000 (RO)
SMDK2410 #
2） pro off all 解除所有内存的保护状态
erase all 擦除所有内存
md 0 显示内存信息
SMDK2410 # md 0
00000000: ffffffff ffffffff ffffffff ffffffff ................
00000010: ffffffff ffffffff ffffffff ffffffff ................
00000020: ffffffff ffffffff ffffffff ffffffff ................
00000030: ffffffff ffffffff ffffffff ffffffff ................
00000040: ffffffff ffffffff ffffffff ffffffff ................
00000050: ffffffff ffffffff ffffffff ffffffff ................
00000060: ffffffff ffffffff ffffffff ffffffff ................
00000070: ffffffff ffffffff ffffffff ffffffff ................
00000080: ffffffff ffffffff ffffffff ffffffff ................
00000090: ffffffff ffffffff ffffffff ffffffff ................
000000a0: ffffffff ffffffff ffffffff ffffffff ................
000000b0: ffffffff ffffffff ffffffff ffffffff ................
000000c0: ffffffff ffffffff ffffffff ffffffff ................
000000d0: ffffffff ffffffff ffffffff ffffffff ................
000000e0: ffffffff ffffffff ffffffff ffffffff ................
000000f0: ffffffff ffffffff ffffffff ffffffff ................
SMDK2410 #
3）内存拷贝 cp.b 目标地址 要存放的地址 $(filesize) 后边的$(filesize)是下载的文件大小,直接用$(filesize)，不改变。
4）定义DEBUG ，可以使用CFI的调试.至于是什么，不知道!没试过，只是听说了……
