c_copy

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

The copy Command
copy

The copy command copies a specified number of bytes from one location 
in memory to another.

Format

The format of the copy command is:

copy [-f] from to size

where:

from	declares the source address location. 

to	declares the target address location. 

size	is the size of the block of memory to be copied. This quantity 
	is specified in bytes.

-f	Specifies that the destination is flash memory.

Functional Description

The copy command replicates a specified number of bytes from one place 
in memory to another. 

The -f option is used when copying to flash memory. This requires that
the board supports writes to that address range, and that the flash
memories support sector erase.

If to is less than from, copying is performed in ascending order starting at 
from. If from is less than to, copying is performed in descending order 
starting at from + size.

When moving a data block down, the source data is copied from the
bottom of the block upwards: and when moving a data block up, the
source data is copied from the top of the block downwards. By this
technique, there is no risk of copying over data in overlapping block
move operations; as the data in the overlapping area is copied first.
However, if the -f option is specified, copying is always performed
in ascending address order.

Examples