M5253EVBE Users Manual, Rev. 1
Freescale Semiconductor
2-9
encountered and control returned to dBUG. By default, the initial trigger value for a breakpoint is one, but
the -t option allows setting the initial trigger for the breakpoint.
If no address is specified in conjunction with the -c or -t options, then all breakpoints are initialized to the
values specified by the -c or -t option.
Examples:
To set a breakpoint at the C function main() (symbol _main; see “symbol” command), the command is:
br _main
When the target code is executed and the processor reaches main(), control will be returned to dBUG.
To set a breakpoint at the C function bench() and set its trigger value to 3, the command is:
br _bench -t 3
When the target code is executed, the processor must attempt to execute the function bench() a third time
before returning control back to dBUG.
To remove all breakpoints, the command is:
br -r
2.4.6
BS (Block Search)
Usage: BS <width> begin end data
The BS command searches a contiguous block of memory starting at address begin, stopping at address
end, for the value data. <Width> modifies the size of the data that is compared during the search. If no
<width> is specified, the default of word sized data is used.
The values for addresses begin and end may be absolute addresses specified as hexadecimal values, or
symbol names. The value for data may be a symbol name or a number converted according to the
user-defined radix, normally hexadecimal.
This command first aligns the starting address for the data access size, and then increments the address
accordingly during the operation. Thus, for the duration of the operation, this command performs
properly-aligned memory accesses.
Examples:
To search for the 16-bit value 0x1234 in the memory block starting at 0x0004_0000 and ending at
0x0008_0000:
bs 40000 80000 1234
This reads the 16-bit word located at 0x0004_0000 and compares it against the 16-bit value 0x1234. If no
match is found, then the address is incremented to 0x0004_0002 and the next 16-bit value is read and
compared.
To search for the 32-bit value 0xABCD in the memory block starting at 0x0004_0000 and ending at
0x0008_0000:
bs.l 40000 80000 ABCD