Albatron Technology ARM11/Cortex-A8

bdiGDB

for GNU Debugger, BDI2000 (ARM11/Cortex-A8) User Manual 29

BREAKMODE mode This parameter deﬁnes how breakpoints are implemented.

SOFT This is the normal mode. Breakpoints are implemented

by replacing code with a BKPT instruction.

HARD In this mode, the breakpoint hardware is used. Only 6

breakpoints at a time are supported.

Example: BREAKMODE HARD

MEMACCES mode [wait] For Cortex-A8, this parameter deﬁnes how memory is accessed. Either

via the ARM core by executing ld and st instructions or via the AHB access

port. The current mode can also be changed via the Telnet interface. The

optional wait parameter allows to deﬁne a time the BDI waits before it ex-

pects that a value is ready or written. This allows to optimize download

performance. The wait time is (8 x wait) TCK’s in Run-Test/Idle state.

The following modes are supported:

CORE The CORE (default) mode requires that the core is halt-

ed and makes use of the memory management unit

(MMU) and cache.

AHB The AHB access mode can access memory even when

the core is running but bypasses the MMU and cache.

Example: MEMACCES CORE 5 ; 40 TCK's access delay

SIO port [baudrate] When this line is present, a TCP/IP channel is routed to the BDI’s RS232

connector. The port parameter deﬁnes the TCP port used for this BDI to

host communication. You may choose any port except 0 and the default

Telnet port (23). On the host, open a Telnet session using this port. Now

you should see the UART output in this Telnet session. You can use the

normal Telnet connection to the BDI in parallel, they work completely inde-

pendent. Also input to the UART is implemented.

port The TCP/IP port used for the host communication.

baudrate The BDI supports 2400 ... 115200 baud

Example: SIO 7 9600 ;TCP port for virtual IO

DCC port When this line is present, a TCP/IP channel is routed to the ARM debug

communication channel (DCC). The port parameter deﬁnes the TCP port

used for this BDI to host communication. You may choose any port except

0 and the default Telnet port (23). On the host, open a Telnet session using

this port. Now you should see the DCC output in this Telnet session. You

can use the normal Telnet connection to the BDI in parallel, they work

completely independent. Also input to DCC is implemented.

port The TCP/IP port used for the host communication.

Example: DCC 7 ;TCP port for DCC I/O