Programming a at91SAM7x256 (on a SAM7-EX256-Board from Olimex) using a ARM-USB-OCD programmer and open source software using linux (debain).

Date: 28-12-2011

• summon-arm-toolchain which you can get using the following commands (see this page):
  

• git clone git://github.com/esden/summon-arm-toolchain.git

• cd summon-arm-toolchain

• It will be build using the commant in the summon-arm-toolchain folder:

• ./summon-arm-toolchain

• The binaries will be built in the $(HOME)/sat folder. If you add export PATH=$PATH:$HOME/sat/bin to your .bashrc file you can use the commands directly (after a new login to your windowmanager).
• The commands are called: arm-none-eabi-*

• I have the ARM-USM-OCD from Olimex and I use openocd.
• If you use debian you can just install it using your preferred package manager (e.g. apt-get install openocd).
• However this is nor really the problematic part. The problem actually is the configuration file(s) which you neet to get the damn thing to work!
• I strongly suggest you create your own openocd.cfg in your working directory which contains
• the configuration file for your interface:
  source [find interface/arm-usb-ocd.cfg]
• some timing parameters (do not aske me about them! openocd complains if they are missing so I inserted them from my older file.
  jtag_khz 6000
  jtag_nsrst_delay 200
  jtag_ntrst_delay 200     
• the configuration file for your target
  source [find target/at91sam7x256.cfg]
• That is it!
• You can start openocd by just executing it (without any parameters):
• openocd
• If you connected the target to the interface and the interface to your computer you should get the following result:
  Open On-Chip Debugger 0.5.0 (2011-08-09-08:45)
  Licensed under GNU GPL v2
  For bug reports, read
      http://openocd.berlios.de/doc/doxygen/bugs.html
  Info : only one transport option; autoselect 'jtag'
  6000 kHz
  adapter_nsrst_delay: 200
  jtag_ntrst_delay: 200
  srst_only srst_pulls_trst srst_gates_jtag srst_open_drain
  Runtime Error: openocd.cfg:14: invalid command name "halt"
  in procedure 'script'
  at file "embedded:startup.tcl", line 58
  at file "openocd.cfg", line 14
  Info : clock speed 6000 kHz
  Info : JTAG tap: sam7x256.cpu tap/device found: 0x3f0f0f0f (mfg: 0x787, part: 0xf0f0, ver: 0x3)
  Info : Embedded ICE version 1
  Info : sam7x256.cpu: hardware has 2 breakpoint/watchpoint units
• Open an other terminal in your working directory and use the following commands to load your programme to the flash and start it:
  halt
  at91sam7 gpnvm 2 set
  flash write_bank 0 <your-.bin-file> 0x0
  reset
  resume 0x100000
• That should do the trick. However you check your jumper settings before you start:
• TST: removed
• JTAGSEL: removed
• ERASE: removed
• PHY_PD: disconnect all connections