继?u-boot-2012.04.01移植二支持NAND启动，继续修改代码支持NAND Flash、NOR Flash。最后直接用NOR Flash里的u-boot烧写自己移植的u-boot到NAND，方便电脑没有并口或手上没有openjtag,照样能移植u-boot，当然有openjtag更方便。
开发环境：
系统：ubuntu 10.04.4
单板：tq2440
NAND FLASH：K9F1216U0A 256MB
NOR Flash：EN29LV160AB 2MB
SDRAM：HY57V561620 x2 64MB
NET：DM9000AEP
编译器：arm-linux-gcc-4.3.2
搭建开发环境详见ubuntu 10.04.4开发环境配置。
目标：
1.支持NOR Flash启动，串口正常输出
2.支持NAND启动
3.支持DM9000网卡
4.添加u-boot菜单
5.裁剪u-boot及制作补丁
虽然单板现在支持NAND Flash、NOR Flash启动，但u-boot还不支持读写NAND Flash、NOR Flash，继续完善u-boot.修改u-boot支持NOR Flash
1.定义DEBUG,输出调试信息
drivers/mtd/cfi_flash.c:增加宏定义
#define _DEBUG 1//*add print message
#define ?DEBUG 1//*add print message
change@change:~$ cd Si/TQ2440/u-boot-2012.04.01/
change@change:~/Si/TQ2440/u-boot-2012.04.01$ make distclean?
change@change:~/Si/TQ2440/u-boot-2012.04.01$ make TQ2440_config?
Configuring for TQ2440 board...
change@change:~/Si/TQ2440/u-boot-2012.04.01$ make
编译成功，烧写到NAND启动串口输出
U-Boot 2012.04.01 (May 03 2013 - 10:25:00)
CPUID: 32440001
FCLK: ? ? ?400 MHz
HCLK: ? ? ?100 MHz
PCLK: ? ? ? 50 MHz
DRAM: ?64 MiB
WARNING: Caches not enabled
Flash: fwc addr (null) cmd f0 00f0 16bit x 16 bit
fwc addr 0000aaaa cmd aa 00aa 16bit x 16 bit
fwc addr 00005554 cmd 55 0055 16bit x 16 bit
fwc addr 0000aaaa cmd 90 0090 16bit x 16 bit
fwc addr (null) cmd f0 00f0 16bit x 16 bit
JEDEC PROBE: ID f0 ea00 0
fwc addr (null) cmd ff 00ff 16bit x 16 bit
fwc addr (null) cmd 90 0090 16bit x 16 bit
fwc addr (null) cmd ff 00ff 16bit x 16 bit
JEDEC PROBE: ID 90 ea00 0
0 KB
*** Warning - bad CRC,using default environment
In: ? ?serial
Out: ? serial
Err: ? serial
Net: ? no support
TQ2440 #?
上面是NOR Flash发出的各种命令，识别出JEDEC PROBE: ID f0 ea00 0
2.修改代码
change@change:~/Si/TQ2440/u-boot-2012.04.01$ grep "JEDEC PROBE" * -nR
drivers/mtd/cfi_flash.c:1699: ? ? ? ? ? ? ? ? ? ? ? ? ? debug("JEDEC PROBE: ID %x %x %xn",
Binary file drivers/mtd/libmtd.o matches
Binary file drivers/mtd/cfi_flash.o matches
Binary file u-boot matches
Binary file u-boot.bin matches
change@change:~/Si/TQ2440/u-boot-2012.04.01$?
进入drivers/mtd/cfi_flash.c:1699，看到打印ID后会跟jedec_flash_mach匹配，找到数组jedec_table[],去找与之匹配的id?f0 ea00 0，找不到就增加该设备ID
结合NOR Flash手册修改代码drivers/mtd/jedec_flash.c370：
{
.mfr_id = 0xf0,//nanufaction id
.dev_id = 0xea00,//device id
.name = "TQ2440 NOR",
.uaddr = {/*Nor flash */
[1] = MTD_UADDR_0x0555_0x02AA /* x16 */
},
.DevSize = SIZE_2MiB,
.CmdSet = P_ID_AMD_STD,
.NumEraseRegions= 4,
.regions = {
ERASEINFO(0x4000,1),
ERASEINFO(0x2000,2),
ERASEINFO(0x8000,
ERASEINFO(0x10000,31),
}
},
change@change:~/Si/TQ2440/u-boot-2012.04.01$ make distclean?
change@change:~/Si/TQ2440/u-boot-2012.04.01$ make TQ2440_config?
Configuring for TQ2440 board...
change@change:~/Si/TQ2440/u-boot-2012.04.01$ make
烧写测试，NAND启动串口输出
U-Boot 2012.04.01 (May 03 2013 - 11:21:29)
CPUID: 32440001
FCLK: ? ? ?400 MHz
HCLK: ? ? ?100 MHz
PCLK: ? ? ? 50 MHz
DRAM: ?64 MiB
WARNING: Caches not enabled
Flash: fwc addr (null) cmd f0 00f0 16bit x 16 bit
fwc addr 0000aaaa cmd aa 00aa 16bit x 16 bit
fwc addr 00005554 cmd 55 0055 16bit x 16 bit
fwc addr 0000aaaa cmd 90 0090 16bit x 16 bit
fwc addr (null) cmd f0 00f0 16bit x 16 bit
JEDEC PROBE: ID f0 ea00 0
ERROR: too many flash sectors
1 MiB
*** Warning - bad CRC,using default environment
In: ? ?serial
Out: ? serial
Err: ? serial
Net: ? no support
TQ2440 #?
change@change:~/Si/TQ2440/u-boot-2012.04.01$ grep "too many flash sectors" * -nR
drivers/mtd/cfi_flash.c:2020: ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? printf("ERROR: too many flash sectorsn");
Binary file drivers/mtd/libmtd.o matches
drivers/mtd/jedec_flash.c:444: ? ? ? ? ? ? ? ? ? ? ? ? ?printf("ERROR: too many flash sectorsn");
Binary file drivers/mtd/jedec_flash.o matches
Binary file drivers/mtd/cfi_flash.o matches
Binary file u-boot matches
Binary file u-boot.bin matches
change@change:~/Si/TQ2440/u-boot-2012.04.01$?
修改include/configs/TQ2440.h191:
//#define CONFIG_SYS_MAX_FLASH_SECT (19)
#define CONFIG_SYS_MAX_FLASH_SECT (128)
change@change:~/Si/TQ2440/u-boot-2012.04.01$?make distclean?
change@change:~/Si/TQ2440/u-boot-2012.04.01$?make TQ2440_config?
Configuring for TQ2440 board...
change@change:~/Si/TQ2440/u-boot-2012.04.01$?make
烧写测试，NAND启动串口输出
U-Boot 2012.04.01 (May 03 2013 - 11:33:35)
CPUID: 32440001
FCLK: ? ? ?400 MHz
HCLK: ? ? ?100 MHz
PCLK: ? ? ? 50 MHz
DRAM: ?64 MiB
WARNING: Caches not enabled
Flash: 2 MiB
*** Warning - bad CRC,using default environment
In: ? ?serial
Out: ? serial
Err: ? serial
Net: ? no support
TQ2440 # flinfo
Bank # 1: TQ2440 NOR Flash flash (16 x 16) ?Size: 2 MB in 35 Sectors
? AMD Legacy command set,Manufacturer ID: 0xF0,Device ID: 0xEA00
? Erase timeout: 30000 ms,write timeout: 100 ms
? Sector Start Addresses:
? 00000000 ? RO ? 00004000 ? RO ? 00006000 ? RO ? 00008000 ? RO ? 00010000 ? RO?
? 00020000 ? RO ? 00030000 ? RO ? 00040000 ? RO ? 00050000 ? RO ? 00060000 ? ? ?
? 00070000 ? RO ? 00080000 ? ? ? ?00090000 ? ? ? ?000A0000 ? ? ? ?000B0000 ? ? ?
? 000C0000 ? ? ? ?000D0000 ? ? ? ?000E0000 ? ? ? ?000F0000 ? ? ? ?00100000 ? ? ?
? 00110000 ? ? ? ?00120000 ? ? ? ?00130000 ? ? ? ?00140000 ? ? ? ?00150000 ? ? ?
? 00160000 ? ? ? ?00170000 ? ? ? ?00180000 ? ? ? ?00190000 ? ? ? ?001A0000 ? ? ?
? 001B0000 ? ? ? ?001C0000 ? ? ? ?001D0000 ? ? ? ?001E0000 ? ? ? ?001F0000 ? ? ?
TQ2440 #?
基本正常，可以看到单板支持NOR Flash
