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18.3.1 ARM

target rdi dev

ARM Angel monitor, via RDI library interface to ADP protocol. You may use this target to communicate with both boards running the Angel monitor, or with the EmbeddedICE JTAG debug device.

target rdp dev

ARM Demon monitor.

No value for GDBN provides the following ARM-specific commands:

set arm disassembler

This commands selects from a list of disassembly styles. The "std" style is the standard style.

show arm disassembler

Show the current disassembly style.

set arm apcs32

This command toggles ARM operation mode between 32-bit and 26-bit.

show arm apcs32

Display the current usage of the ARM 32-bit mode.

set arm fpu fputype

This command sets the ARM floating-point unit (FPU) type. The argument fputype can be one of these:


Determine the FPU type by querying the OS ABI.


Software FPU, with mixed-endian doubles on little-endian ARM processors.


GCC-compiled FPA co-processor.


Software FPU with pure-endian doubles.


VFP co-processor.

show arm fpu

Show the current type of the FPU.

set arm abi

This command forces No value for GDBN to use the specified ABI.

show arm abi

Show the currently used ABI.

set debug arm

Toggle whether to display ARM-specific debugging messages from the ARM target support subsystem.

show debug arm

Show whether ARM-specific debugging messages are enabled.

The following commands are available when an ARM target is debugged using the RDI interface:

rdilogfile [file]

Set the filename for the ADP (Angel Debugger Protocol) packet log. With an argument, sets the log file to the specified file. With no argument, show the current log file name. The default log file is ‘rdi.log’.

rdilogenable [arg]

Control logging of ADP packets. With an argument of 1 or "yes" enables logging, with an argument 0 or "no" disables it. With no arguments displays the current setting. When logging is enabled, ADP packets exchanged between No value for GDBN and the RDI target device are logged to a file.

set rdiromatzero

Tell No value for GDBN whether the target has ROM at address 0. If on, vector catching is disabled, so that zero address can be used. If off (the default), vector catching is enabled. For this command to take effect, it needs to be invoked prior to the target rdi command.

show rdiromatzero

Show the current setting of ROM at zero address.

set rdiheartbeat

Enable or disable RDI heartbeat packets. It is not recommended to turn on this option, since it confuses ARM and EPI JTAG interface, as well as the Angel monitor.

show rdiheartbeat

Show the setting of RDI heartbeat packets.

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