GDB can use the MIPS remote debugging protocol to talk to a MIPS board attached to a serial line. This is available when you configure GDB with `--target=mips-idt-ecoff'.
Use these GDB commands to specify the connection to your target board:
target mips port
gdb
with the
name of your program as the argument. To connect to the board, use the
command `target mips port', where port is the name of
the serial port connected to the board. If the program has not already
been downloaded to the board, you may use the load
command to
download it. You can then use all the usual GDB commands.
For example, this sequence connects to the target board through a serial
port, and loads and runs a program called prog through the
debugger:
host$ gdb prog GDB is free software and ... (gdb) target mips /dev/ttyb (gdb) load prog (gdb) run
target mips hostname:portnumber
target pmon port
target ddb port
target lsi port
target r3900 dev
target array dev
GDB also supports these special commands for MIPS targets:
set processor args
show processor
set processor
command to set the type of MIPS
processor when you want to access processor-type-specific registers.
For example, set processor r3041
tells GDB
to use the CPU registers appropriate for the 3041 chip.
Use the show processor
command to see what MIPS processor GDB
is using. Use the info reg
command to see what registers
GDB is using.
set mipsfpu double
set mipsfpu single
set mipsfpu none
show mipsfpu
mipsfpu
variable with
`show mipsfpu'.
set remotedebug n
show remotedebug
remotedebug
variable. If you set it to 1
using
`set remotedebug 1', every packet is displayed. If you set it
to 2
, every character is displayed. You can check the current value
at any time with the command `show remotedebug'.
set timeout seconds
set retransmit-timeout seconds
show timeout
show retransmit-timeout
set timeout seconds
command. The
default is 5 seconds. Similarly, you can control the timeout used while
waiting for an acknowledgement of a packet with the set
retransmit-timeout seconds
command. The default is 3 seconds.
You can inspect both values with show timeout
and show
retransmit-timeout
. (These commands are only available when
GDB is configured for `--target=mips-idt-ecoff'.)
The timeout set by set timeout
does not apply when GDB
is waiting for your program to stop. In that case, GDB waits
forever because it has no way of knowing how long the program is going
to run before stopping.
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