Breakpoint Handling | Albatron Technology ARM11/Cortex-A8 instruction

bdiGDB for GNU Debugger, BDI2000 (ARM11/Cortex-A8)

User Manual 41

3.3.3 Breakpoint Handling

There are two breakpoint modes supported. One of them (SOFT) is implemented by replacing appli- cation code with a BKPT instruction. The other (HARD) uses the built in breakpoint logic. If HARD is selected, only up to 6 breakpoints can be active at the same time.

The following example selects SOFT as the breakpoint mode:

BREAKMODE SOFT

;SOFT or HARD, HARD uses hardware breakpoints

The BDI supports only a GDB version that uses a Z-Packet to set breakpoints (GDB Version 5.0 or newer). GDB tells the BDI to set / clear breakpoints with this special protocol unit. The BDI will re- spond to this request by replacing code in memory with the BKPT instruction or by setting the appro- priate hardware breakpoint.

3.3.4 GDB monitor command

The BDI supports the GDB V5.x "monitor" command. Telnet commands are executed and the Telnet output is returned to GDB.

(gdb) target remote bdi2000:2001 Remote debugging using bdi2000:2001 0x10b2 in start ()

(gdb) monitor md 0 1

00000000 : 0xe59ff018 - 442503144 ...

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Albatron Technology ARM11/Cortex-A8 user manual Breakpoint Handling, GDB monitor command

Contents

BdiGDB Using bdiGDB InstallationIntroduction BDI2000 BDI Conﬁguration Appendices Troubleshooting Maintenance Trademarks BDI2000 Introduction BDI Conﬁguration For BDI Main / Target a connector signals see table on next InstallationConnecting the BDI2000 to Target Jtag Test Reset BDI Main / Target a Connector Signals Changing Target Processor Type Adaptive Clocking For Target B connector signals see table on next Returned Jtag Test Clock BDI Target B Connector Signals External power supply Target system Please switch on the system in the following sequence 142 Power Supply from Target System Built in LED indicates the following BDI states Status LED «MODE» RS232 Connector Ethernet communication BASE-T ConnectorPC Host Name Description Activating Bootp Installation of the Conﬁguration SoftwareOverview of an installation / conﬁguration process Load/Update the BDI ﬁrmware/logic Build the setup tool1 Conﬁguration with a Linux / Unix host Following the steps to bring-up a new BDI2000 Transmit the initial conﬁguration parameters Check conﬁguration and exit loader modeﬁle name without any path For more information about Tftp use man tftpd Ory / programmable logic 2 Conﬁguration with a Windows host Reassemble the unit as described in Appendix «Maintenance» Recover procedure Tftp server for Windows NT Testing the BDI2000 to host connection Principle of operation Using bdiGDB Conﬁguration File Part Init BdiGDB for GNU Debugger, BDI2000 ARM11/Cortex-A8 ROM on the target, select ROM as the format Using a startup program to initialize the target systemFormat COFF, SREC, AOUT, BIN, ELF or ROM Example Format Coff Cputype ARM1136 Part TargetNone Pushpull Stop HaltRUN Loadonly Hard SoftBreakmode Hard Core Daisy chained Jtag devices Low level Jtag scan chain conﬁguration Part Host Dump ﬁlename Prompt ARM11 Part Flash BLOCK, CHIP, Unlock AM29BX8 MIRRORX8, I28BX8 STRATAX8, AT49X8 Supported Flash Memories Tor. In other words, this is the size of one sector in bytes Or use the Telnet unlock command Part Regs Register deﬁnition ﬁle Example for a register deﬁnitionEntry in the conﬁguration ﬁle Debugging with GDB Target setupConnecting to the target Breakpoint Handling GDB monitor command Target serial I/O via BDI Target DCC I/O via BDI Telnet Interface Dump Command list Some examples CP15 ID register CRn = 0, opcode2 = CPxx RegistersCP15 Cache Type CRn = 0, opcode2 = CP15 Invalidate I cache line CRn = 7, opcode2 = 1, CRm = Multi-Core Support BASE-T Speciﬁcations Declaration of Conformity CE Environmental notice Warranty Problem Troubleshootingﬁrmware can not be loaded Possible reasons Unplug the cables Maintenance Reinstallation All trademarks are property of their respective holders Trademarks