一、 移植NOR FLASH
去掉配置文件include\configs\tq2440.h中的宏并修改代码段基地址
#define CONFIG_SYS_TEXT_BASE 0x0
//#defineCONFIG_SKIP_LOWLEVEL_INIT
在board\tq2440\lowlevel_init.S修改SDRAM’刷新频率
#define REFCNT 0x4f4
该文件中的这三条指令其实可以用一条指令替换adrl r0, SMRDATA
ldr r0, =SMRDATA
ldr r1, _TEXT_BASE
sub r0, r0, r1
进入/drivers/mtd/cfi_flash.c中的flash_init()函数
在该文件开头定义宏DEBUG打开调试信息
#define DEBUG 1
#define _DEBUG 1
重新编译
用原先的u-boot从NOR FLASH启动，将新u-boot.bin烧到NOR FLASH
TQ2440 # tftp 32000000u-boot.bin
dm9000 i/o: 0x20000000, id:0x90000a46
DM9000: running in 16 bitmode
MAC: 00:0c:29:4d:e4:f4
Using dm9000 device
TFTP from server172.28.12.60; our IP address is 172.28.12.10
Filename 'u-boot.bin'.
Load address: 0x32000000
Loading: T #############
done
Bytes transferred = 180828(2c25c hex)
TQ2440 # protect off all
Un-Protect Flash Bank # 1
TQ2440 # erase 0 +30000
...... done
Erased 6 sectors
TQ2440 # cp.b 32000000 030000
Copy to Flash...9....8....7....6....5....4....3....2....1....done
TQ2440 #
重启开发板
U-Boot 2012.04.01 (Dec 292012 - 14:25:05)
CPUID: 32440001
FCLK: 400 MHz
HCLK: 100 MHz
PCLK: 50 MHz
DRAM: 64 MiB
WARNING: Caches not enabled
Flash: fwc addr (null) cmdf0 00f0 16bit x 16 bit
fwc addr 0000aaaa cmd aa00aa 16bit x 16 bit
fwc addr 00005554 cmd 550055 16bit x 16 bit
fwc addr 0000aaaa cmd 900090 16bit x 16 bit
fwc addr (null) cmd f0 00f016bit x 16 bit
JEDEC PROBE: ID 1c2249 0
fwc addr (null) cmd ff 00ff16bit x 16 bit
fwc addr (null) cmd 90 009016bit x 16 bit
fwc addr (null) cmd ff 00ff16bit x 16 bit
JEDEC PROBE: ID 13 ea00 0
*** failed ***
### ERROR ### Please RESETthe board ###
搜索“JEDEC PROBE:”
flash_read_jedec_ids(info);
debug("JEDECPROBE: ID %x %x %x\n",
info->manufacturer_id,
info->device_id,
info->device_id2);
if (jedec_flash_match(info,info->start[0]))
break;
else
unmap_physmem((void*)info->start[0],
MAP_NOCACHE);
drivers\mtd\jedec_flash.c中的jedec_flash_match()函数：
/*-----------------------------------------------------------------------
* match jedec ids against table. If a match isfound, fill flash_info entry
*/
intjedec_flash_match(flash_info_t *info, ulong base)
{
int ret = 0;
int i;
ulong mask = 0xFFFF;
if (info->chipwidth == 1)
mask = 0xFF;
for (i = 0; i < ARRAY_SIZE(jedec_table); i++) {
if ((jedec_table[i].mfr_id & mask) ==(info->manufacturer_id & mask) &&
(jedec_table[i].dev_id & mask) == (info->device_id & mask)) {
fill_info(info, &jedec_table[i], base);
ret = 1;
break;
}
}
return ret;
}
flash_read_jedec_ids(info)读出了我们的开发板的NOR FLASH的厂商ID为0x1c,设备ID为0x2249
jedec_flash_match(info,info->start[0])将读出的信息与jedec_table[]数组进行匹配，如果有匹配成功则填充flashin信息并返回1，否则返回0。说明这里没有匹配成功，需要在jedec_table[]数组中添加我们自己开发板的NOR FLASH信息。
修改配置文件include\configs\tq2440.h
#defineCONFIG_SYS_FLASH_LEGACY_1024Kx16
在drivers\mtd\jedec_flash.c文件中jedec_table[]数组中增加EN29LV160AB的配置根据芯片手册。
#ifdefCONFIG_SYS_FLASH_LEGACY_1024Kx16
/* TQ2440 EN29LV160AB */
{
.mfr_id = 0x1c, /* 厂商ID */
.dev_id = 0x2249, /* 设备ID */
.name = "EON EN29LV160AB",
.uaddr = {/* 因为NOR FLASH的ADDR0接到了S3C2440的ADDR1 */
[1] = MTD_UADDR_0x0555_0x02AA/* x16 */
},
.DevSize = SIZE_2MiB,
.CmdSet = P_ID_AMD_STD,
.NumEraseRegions= 4,
.regions = {
ERASEINFO(0x04000, 1),
ERASEINFO(0x02000, 2),
ERASEINFO(0x08000, 1),
ERASEINFO(0x10000, 31),
}
},
#endif
重新编译通过工具将u-boot.bin烧写到NOR FLASH
U-Boot 2012.04.01 (Dec 292012 - 15:26:09)
CPUID: 32440001
FCLK: 400 MHz
HCLK: 100 MHz
PCLK: 50 MHz
DRAM: 64 MiB
WARNING: Caches not enabled
Flash: fwc addr (null) cmdf0 00f0 16bit x 16 bit
fwc addr 0000aaaa cmd aa00aa 16bit x 16 bit
fwc addr 00005554 cmd 550055 16bit x 16 bit
fwc addr 0000aaaa cmd 900090 16bit x 16 bit
fwc addr (null) cmd f0 00f016bit x 16 bit
JEDEC PROBE: ID 1c 2249 0
ERROR: too manyflash sectors
2 MiB
*** Warning - bad CRC, usingdefault environment
In: serial
Out: serial
Err: serial
Net: No ethernet found.
TQ2440 #
出现一个错误ERROR: too many flash sectors
修改配置文件include\configs\tq2440.h
#defineCONFIG_SYS_MAX_FLASH_SECT (35)
取消调试信息drivers\mtd\cfi_flash.c
//#define DEBUG 1
//#define _DEBUG 1
重新编译
U-Boot 2012.04.01 (Dec 292012 - 15:33:09)
CPUID: 32440001
FCLK: 400 MHz
HCLK: 100 MHz
PCLK: 50 MHz
DRAM: 64 MiB
WARNING: Caches not enabled
Flash: 2 MiB
*** Warning - bad CRC, usingdefault environment
In: serial
Out: serial
Err: serial
Net: No ethernet found.
TQ2440 # fflinfo
Bank # 1: EON EN29LV160ABflash (16 x 16) Size: 2 MB in 35 Sectors
AMD Legacy command set, Manufacturer ID:0x1C, Device ID: 0x2249
Erase timeout: 30000 ms, write timeout: 100ms
Sector Start Addresses:
00000000 RO 00004000 RO 00006000 RO 00008000 RO 00010000 RO
00020000 RO 00030000 00040000 00050000 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 # md.b 32000000 a
32000000: 13 00 00 ea 14 f09f e5 14 f0 ..........
TQ2440 # erase 100000 +a
. done
Erased 1 sectors
TQ2440 # cp.b 32000000100000 a
Copy to Flash... done
TQ2440 # md.b 100000 a
00100000: 13 00 00 ea 14 f09f e5 14 f0 ..........