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102 lines
2.9 KiB
102 lines
2.9 KiB
18 years ago
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The copy Command
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copy
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The copy command copies a specified number of bytes from one location
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in memory to another.
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Format
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The format of the copy command is:
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copy [-f] from to size
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where:
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from declares the source address location.
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to declares the target address location.
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size is the size of the block of memory to be copied. This quantity
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is specified in bytes.
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-f Specifies that the destination is flash memory.
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Functional Description
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The copy command replicates a specified number of bytes from one place
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in memory to another.
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The -f option is used when copying to flash memory. This requires that
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the board supports writes to that address range, and that the flash
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memories support sector erase.
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If to is less than from, copying is performed in ascending order starting at
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from. If from is less than to, copying is performed in descending order
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starting at from + size.
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When moving a data block down, the source data is copied from the
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bottom of the block upwards: and when moving a data block up, the
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source data is copied from the top of the block downwards. By this
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technique, there is no risk of copying over data in overlapping block
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move operations; as the data in the overlapping area is copied first.
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However, if the -f option is specified, copying is always performed
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in ascending address order.
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Examples
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� This example shows how to copy a block of memory, 8 Kbytes in
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size, with a base address of 0x80020000, to another 8-Kbyte area
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starting at the address 0x80060000.
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PMON copy 80020000 80060000 2000
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� This example shows how to copy a block of memory, 4 Kbytes in
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size, with a base address of 0x80020000, to a 4-Kbyte area of
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flash memory starting at the address 0x80060000.
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PMON copy -f 80020000 bfc40000 1000
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� This example shows how an application program may be copied into flash.
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This example is applicable to PMON only.
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pmcc -prom -crt0 -T 9fc40000 -D 80020000 -o bubble crt1.s bubble.c
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PMON load e03e0000
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-- download bubble.rec
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total = 146e
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PMON copy -f 80020000 bfc40000 1500
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Note:
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� The file crt1.s is exactly the same as lib/crt1.s, except that the
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following lines have been added before the call to clrbss.
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li a0,0x80020000
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jal cpdata
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� The value e03e0000 is the difference between the link address 9fc40000
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and the load address 80020000 (0x180020000-0x9fc40000=0xe03e0000).
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� The size argument for the copy command has been rounded up. The value
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must be the total as reported by the load command plus at least 32.
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To run the application, type,
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PMON g 9fc40000
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Files
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The copy command is located in mon/copy.c.
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See Also
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compare command
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��������������������������������������������������������������������������������
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Navigation:
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Document Home |
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Document Contents |
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Document Index
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**This file was converted from HTML to TEXT using a TRIAL version of**
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**Markup Remover 1.1 (C) 1998 by Aquatic Moon Software http://www.aquaticmoon.com/**
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**This message does not appear in files converted after the program has been liscensed.**
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