我修改的代码已经上传到github上，地址：https://github.com/qiaoyuguo/u-boot-2014.04-mini2440.git
参考文章： 《u-boot-2011.09在ST2410上的移植-启用CS8900网卡功能》
参考文档： s3c2440手册（下载地址） mini2440电路图（下载地址） SST39VF1601芯片手册（下载地址）
前一篇博文：《mini2440移植uboot 2014.04(一）》
（四）添加nor flash支持
我的mini2440使用的nor flash芯片型号是SST的39VF1601(16Mbits=2MByte)。该nor flash连接nGCS0。
SST39VF1601的数据手册下载地址在这里。
先重启mini2440，进入官方的uboot（如果没有安装官方uboot, 可以按照《openocd+jlink为mini2440调试u-boot》将其先烧进去 ）。
然后执行下面命令查看nor flash信息：
Bank # 1: SST: 1x SST39VF1601 (2MB) Size: 2 MB in 32 Sectors Sector Start Addresses: 00000000 (RO) 00010000 (RO) 00020000 (RO) 00030000 (RO) 00040000 (RO) 00050000 (RO) 00060000 00070000 00080000 00090000 000A0000 000B0000 000C0000 000D0000 000E0000 000F0000 00100000 00110000 00120000 00130000 00140000 00150000 00160000 00170000 00180000 00190000 001A0000 001B0000 001C0000 001D0000 001E0000 001F0000
确实使用了SST39VF1601这款芯片。
上一部分编译出来的uboot在执行时得到下面的输出：
U-Boot 2014.04-g35e1a7f-dirty (Jun 05 2014 - 10:44:42) U-Boot code: 33E80000 -> 33EF9FB4 BSS: -> 33F489D0 CPUID: 32440001 FCLK: 405 MHz HCLK: 101.250 MHz PCLK: 50.625 MHz monitor len: 000C89D0 ramsize: 04000000 TLB table from 33ff0000 to 33ff4000 Top of RAM usable for U-Boot at: 33ff0000 Reserving 802k for U-Boot at: 33f27000 Reserving 4160k for malloc() at: 33b17000 Reserving 32 Bytes for Board Info at: 33b16fe0 Reserving 160 Bytes for Global Data at: 33b16f40 New Stack Pointer is: 33b16f30 RAM Configuration: Bank #0: 30000000 64 MiB addr=33f27000,_start=33e80000 relocation Offset is: 000a7000 WARNING: Caches not enabled monitor flash len: 000847BC Now running in RAM - U-Boot at: 33f27000 Flash: fwc addr 00000000 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 00000000 cmd f0 00f0 16bit x 16 bit JEDEC PROBE: ID f0 ea00 0 fwc addr 00000000 cmd ff 00ff 16bit x 16 bit fwc addr 00000000 cmd 90 0090 16bit x 16 bit fwc addr 00000000 cmd ff 00ff 16bit x 16 bit JEDEC PROBE: ID 90 ea00 0 *** failed *** ### ERROR ### Please RESET the board ###
是在识别nor flash时出错的，仔细看代码后发现jedec_table没有该芯片的定义，将其定义加入到jedec_table的末尾处：
#ifdef CONFIG_SYS_FLASH_LEGACY_1Mx16
{
.mfr_id = 0xf0,
.dev_id = 0xea00,
.name = "SST39VF1601",
.uaddr = {
[0] = MTD_UADDR_0x5555_0x2AAA, /* x8 */
[1] = MTD_UADDR_0x5555_0x2AAA /* x16 */
},
.DevSize = SIZE_2MiB,
.CmdSet = P_ID_AMD_STD,
.NumEraseRegions= 2,
.regions = {
ERASEINFO(0x1000,256),
ERASEINFO(0x1000,256)
}
},
#endif
然后将include/configs/mini2440.h中修改：
#define CONFIG_SYS_FLASH_LEGACY_512Kx16 #define CONFIG_SYS_FLASH_LEGACY_1Mx16
重新编译，然后打开三个控制台，一个执行"sudo minicom"，另一个执行"openocd -f interface/jlink.cfg -f board/mini2440.cfg"，最后一个控制台执行下面内容：
telnet localhost 4444 reset init_2440 load_image /home/host/soft/mini2440/u-boot-2014.04/u-boot.bin 0x33e80000 bin resume 0x33e80000
得到下面的输出信息：
U-Boot 2014.04-g35e1a7f-dirty (Jun 05 2014 - 10:41:41) U-Boot code: 33E80000 -> 33EF9FB4 BSS: -> 33F489D0 CPUID: 32440001 FCLK: 405 MHz HCLK: 101.250 MHz PCLK: 50.625 MHz monitor len: 000C89D0 ramsize: 04000000 TLB table from 33ff0000 to 33ff4000 Top of RAM usable for U-Boot at: 33ff0000 Reserving 802k for U-Boot at: 33f27000 Reserving 4160k for malloc() at: 33b17000 Reserving 32 Bytes for Board Info at: 33b16fe0 Reserving 160 Bytes for Global Data at: 33b16f40 New Stack Pointer is: 33b16f30 RAM Configuration: Bank #0: 30000000 64 MiB addr=33f27000,_start=33e80000 relocation Offset is: 000a7000 WARNING: Caches not enabled monitor flash len: 000847BC dram_bank_mmu_setup: bank: 0 Now running in RAM - U-Boot at: 33f27000 Flash: fwc addr 00000000 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 00000000 cmd f0 00f0 16bit x 16 bit JEDEC PROBE: ID f0 ea00 0 fwc addr 00000000 cmd ff 00ff 16bit x 16 bit fwc addr 00000000 cmd 90 0090 16bit x 16 bit fwc addr 00000000 cmd ff 00ff 16bit x 16 bit JEDEC PROBE: ID 90 ea00 0 *** failed *** ### ERROR ### Please RESET the board ### U-Boot 2014.04-g35e1a7f-dirty (Jun 05 2014 - 10:44:42) U-Boot code: 33E80000 -> 33EF9FB4 BSS: -> 33F489D0 CPUID: 32440001 FCLK: 405 MHz HCLK: 101.250 MHz PCLK: 50.625 MHz monitor len: 000C89D0 ramsize: 04000000 TLB table from 33ff0000 to 33ff4000 Top of RAM usable for U-Boot at: 33ff0000 Reserving 802k for U-Boot at: 33f27000 Reserving 4160k for malloc() at: 33b17000 Reserving 32 Bytes for Board Info at: 33b16fe0 Reserving 160 Bytes for Global Data at: 33b16f40 New Stack Pointer is: 33b16f30 RAM Configuration: Bank #0: 30000000 64 MiB addr=33f27000,_start=33e80000 relocation Offset is: 000a7000 WARNING: Caches not enabled monitor flash len: 000847BC Now running in RAM - U-Boot at: 33f27000 Flash: fwc addr 00000000 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 00000000 cmd f0 00f0 16bit x 16 bit JEDEC PROBE: ID f0 ea00 0 fwc addr 00000000 cmd ff 00ff 16bit x 16 bit fwc addr 00000000 cmd 90 0090 16bit x 16 bit fwc addr 00000000 cmd ff 00ff 16bit x 16 bit JEDEC PROBE: ID 90 ea00 0 *** failed *** ### ERROR ### Please RESET the board ### U-Boot 2014.04-g35e1a7f-dirty (Jun 05 2014 - 10:55:37) U-Boot code: 33E80000 -> 33EF9ECC BSS: -> 33F488D0 CPUID: 32440001 FCLK: 405 MHz HCLK: 101.250 MHz PCLK: 50.625 MHz monitor len: 000C88D0 ramsize: 04000000 TLB table from 33ff0000 to 33ff4000 Top of RAM usable for U-Boot at: 33ff0000 Reserving 802k for U-Boot at: 33f27000 Reserving 4160k for malloc() at: 33b17000 Reserving 32 Bytes for Board Info at: 33b16fe0 Reserving 160 Bytes for Global Data at: 33b16f40 New Stack Pointer is: 33b16f30 RAM Configuration: Bank #0: 30000000 64 MiB addr=33f27000,_start=33e80000 relocation Offset is: 000a7000 WARNING: Caches not enabled monitor flash len: 000846BC Now running in RAM - U-Boot at: 33f27000 Flash: fwc addr 00000000 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 00000000 cmd f0 00f0 16bit x 16 bit JEDEC PROBE: ID f0 ea00 0 Found JEDEC Flash: SST39VF1601 unlock address index 3 unlock addresses are 0x5555/0x2aaa erase_region_count = 256 erase_region_size = 4096 ERROR: too many flash sectors erase_region_count = 256 erase_region_size = 4096 ERROR: too many flash sectors flash_protect ON: from 0x00000000 to 0x000846BB protect on 0 protect on 1 protect on 2 protect on 3 protect on 4 protect on 5 protect on 6 protect on 7 protect on 8 protect on 9 protect on 10 protect on 11 protect on 12 protect on 13 protect on 14 protect on 15 protect on 16 protect on 17 protect on 18 flash_protect ON: from 0x00070000 to 0x0007FFFF protect on 18 2 MiB NAND: board_nand_init() end of nand_init hwcontrol(): 0xff 0x83 hwcontrol(): 0xffffffff 0x81 dev_ready hwcontrol(): 0x90 0x83 hwcontrol(): 0x00 0x85 hwcontrol(): 0xffffffff 0x81 dev_ready hwcontrol(): 0x90 0x83 hwcontrol(): 0x00 0x85 hwcontrol(): 0xffffffff 0x81 dev_ready hwcontrol(): 0xffffffff 0x80 0 MiB *** Warning - bad CRC, using default environment Destroy Hash Table: 33f9c778 table = 00000000 Create Hash Table: N=75 INSERT: table 33f9c778, filled 1/79 rv 33b17238 ==> name="bootdelay" value="5" INSERT: table 33f9c778, filled 2/79 rv 33b170f8 ==> name="baudrate" value="115200" INSERT: table 33f9c778, filled 3/79 rv 33b170a8 ==> name="ipaddr" value="10.0.0.110" INSERT: table 33f9c778, filled 4/79 rv 33b17260 ==> name="serverip" value="10.0.0.1" INSERT: table 33f9c778, filled 5/79 rv 33b174f4 ==> name="netmask" value="255.255.255.0" INSERT: free(data = 33b17008) INSERT: done In: serial Out: serial Err: serial Initial value for argc=3 Final value for argc=3 Initial value for argc=3 Final value for argc=3 Initial value for argc=3 Final value for argc=3 Net: Initial value for argc=3 Final value for argc=3 CS8900-0 ### main_loop entered: bootdelay=5 ### main_loop: bootcmd="<UNDEFINED>"
SMDK2410 # flinfo
Bank # 1: SST39VF1601 flash (16 x 16) Size: 2 MB in 19 Sectors
AMD Legacy command set, Manufacturer ID: 0xF0, Device ID: 0xEA00
Erase timeout: 30000 ms, write timeout: 100 ms
Sector Start Addresses:
00000000 RO 00001000 RO 00002000 RO 00003000 RO 00004000 RO
00005000 RO 00006000 RO 00007000 RO 00008000 RO 00009000 RO
0000A000 RO 0000B000 RO 0000C000 RO 0000D000 RO 0000E000 RO
0000F000 RO 00010000 RO 00011000 RO 00012000 RO
上面的修改方式是比较好的，改动相对来说比较小。
另外一种方法是将mini2440开发板中u-boot的board/tekkman/mini244/flash.c拷贝到当前uboot的board/friendlyarm/mini2440下，
然后在其下Makefile中添加flash.o,但是会有编译错误，提示函数reset_timer_masked未定义。这是因为二者的定时器的一些函数被删除了，
需要对代码做些调整才行。
另外一个方法是模仿m5253demo开发板（配置文件位于include/configs/M5253DEMO.h，开发板文件夹位于board/freescale/m5253demo下），
将其下的flash.c（所用的nor flash是sst的6401，跟当前的1601差别就在于容量和ID号有些不同）拷贝过来做修改，如果感兴趣，可以自己移植看看。