S3C6410的iROM启动方式

jc posted @ 2011年3月10日 05:19 in 体系结构探索 , 5477 阅读

  看过Samsun的手册后知道，在S3C6410从SD卡启动的时候，Bootloader的代码是由iROM里面的“Device Copy Function"来拷贝到Stepping Stone(8kb)的。

而默认的，此函数会将SD卡的倒数第三个块的8KB数据拷贝。所以，如果一个SD卡的块数为S（扇区大小为512byte），那么这8KB的Bootloader应该放到

（S－16）块处。而SDHC卡则跳过最后的1024个块。

例如：我有一个boot.bin，我的SD卡的设备文件为/dev/sdb，那么

# dd if=/dev/zero of=./temp bs=8k count=1

# cat temp >> boot.bin

# split -b 8k led.bin

# mv xaa led.bin

烧录到SD卡：

# fdisk /dev/sdb

 

Disk /dev/sdb: 2002 MB, 2002780160 bytes
11 heads, 10 sectors/track, 35560 cylinders
Units = cylinders of 110 * 512 = 56320 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               2       35561     1955775+   b  W95 FAT32
 
由以上信息可知：
Blocks = 2002780160 / 512 = 3911680
那么boot.bin烧录的位置为 3911680 - 18 = 391162
 
# dd if=./boot.bin of=/dev/sdb bs=8k seek=391172
 
假如是SDHC卡，那么烧录的位置为 3911680 - (18 + 1024)。
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