M5253EVBE Users Manual, Rev. 1
2-8
Freescale Semiconductor
bf bss_start bss_end 0
To fill a block of memory starting at 0x0002_0000 and ending at 0x0004_0000 with data that increments
by 2 for each <width>, the command is:
bf 20000 40000 0 2
2.4.4
BM (Block Move)
Usage: BM begin end dest
The BM command moves a contiguous block of memory starting at address begin and stopping at address
end to the new address dest. The BM command copies memory as a series of bytes, and does not alter the
original block.
The values for addresses begin, end, and dest may be absolute addresses specified as hexadecimal values,
or symbol names. If the destination address overlaps the block defined by begin and end, an error message
is produced and the command exits.
Examples:
To copy a block of memory starting at 0x0004_0000 and ending at 0x0008_0000 to the location
0x0020_0000, the command is:
bm 40000 80000 200000
To copy the target code’s data section (defined by the symbols data_start and data_end) to 0x0020_0000,
the command is:
bm data_start data_end 200000
NOTE
Refer to “upuser” command for copying code/data into Flash memory.
2.4.5
BR (Breakpoints)
Usage: BR addr <-r> <-c count> <-t trigger>
The BR command inserts or removes breakpoints at address addr. The value for addr may be an absolute
address specified as a hexadecimal value, or a symbol name. Count and trigger are numbers converted
according to the user-defined radix, normally hexadecimal.
If no argument is provided to the BR command, a listing of all defined breakpoints is displayed.
The -r option to the BR command removes a breakpoint defined at address addr. If no address is specified
in conjunction with the -r option, then all breakpoints are removed.
Each time a breakpoint is encountered during the execution of target code, its count value is incremented
by one. By default, the initial count value for a breakpoint is zero, but the -c option allows setting the initial
count for the breakpoint.
Each time a breakpoint is encountered during the execution of target code, the count value is compared
against the trigger value. If the count value is equal to or greater than the trigger value, a breakpoint is