AT91SAM7S with Olimex ARM-USB-OCD

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1

I’m looking for some help with my OpenOCD config file, hopefully someone using the same chip.

I’m making progress, I have the drivers installed, and things are configured up to the point that Eclipse can see the debugger and the debugger seems to be mostly working, but actually running the code seems not to work.

I’m using OpenOCD 0.4.0.

Probably my problems lie in the config file, but I’m not having a lot of luck finding docs that apply to this version of OpenOCD, examples, or the data to roll my own.

Below is what I have so far.

I’m not getting any warnings or errors from OpenOCD.

When I start the debug session, things look ok, but I can’t set a breakpoint (Unresolved breakpoint)

Trying to single-step gives me “Target request failed: putpkt: write failed: No error”

Config file:

Written 4/12/11 DVH

References

http://infocenter.arm.com/help/index.js … GHJJB.html

http://mihirknows.blogspot.com/2007/11/ … -card.html

mS delay from nSRST inactive to JTAG instructions

jtag_nsrst_delay 100

mS delay from nTRST inactive to JTAG instructions

jtag_ntrst_delay 100

#use combined on interfaces or targets that can’t set TRST/SRST separately

reset_config srst_only srst_pulls_trst

Control jtag speed

jtag_khz 2000

set _CHIPNAME at91sam7s

set _ENDIAN little

#5.14.2 ARM7TDMI-S device identification code register

The value we actually get

set _CPUTAPID 0x3f0f0f0f

The value we should get

#set _CPUTAPID 0x7F1F0F0F

#5.14.3 Instruction register length

set _TAPLEN 4

set _IRCAPTURE 1

#5.14.5 Scan chain 1 for comm between the debugger and the ARM7TDMI-S core

Scan chain 2 access to EmbeddedICE-RT registers

To do this, scan chain 2 must be selected using the SCAN_N TAP

controller instruction, and then the TAP controller must be put in INTEST mode.

set cpu 1

#reset_config trst_and_srst|trst_only|srst_only srst_pulls_trst|trst_pulls_srst|combined

reset_config srst_only

#jtag scan chain

#format L IRC IRCM IDCODE (Length, IR Capture, IR Capture Mask, IDCODE)

jtag newtap $_CHIPNAME cpu -irlen $_TAPLEN -ircapture $_IRCAPTURE -irmask 0xf -expected-id $_CPUTAPID

set _TARGETNAME $_CHIPNAME.cpu

set _CHIP arm7tdmi

set _VARIANT arm7tdmi_r4

set _CHAINPOS 0

#target create $_TARGETNAME $_CHIP -endian $_ENDIAN -chain-position $_CHAINPOS -variant $_VARIANT

target create $_TARGETNAME $_CHIP -endian $_ENDIAN -chain-position $_TARGETNAME -variant $_VARIANT

$_TARGETNAME configure -event reset-init {

disable watchdog

mww 0xfffffd44 0x00008000

enable user reset

mww 0xfffffd08 0xa5000001

CKGR_MOR : enable the main oscillator

mww 0xfffffc20 0x00000601

sleep 10

CKGR_PLLR: 96.1097 MHz

mww 0xfffffc2c 0x00481c0e

sleep 10

PMC_MCKR : MCK = PLL / 2 ~= 48 MHz

mww 0xfffffc30 0x00000007

sleep 10

MC_FMR: flash mode (FWS=1,FMCN=60)

mww 0xffffff60 0x003c0100

sleep 100

wait_halt

flash probe 0

}

$_TARGETNAME configure -work-area-phys 0x00200000 -work-area-size 0x4000 -work-area-backup 0

#flash bank <base_addr> <chip_width> <bus_width> <target_number> [<target_name> <sectors_per_bank> <pages_per_sector> <page_size> <num_nvmbits> <ext_freq_khz>]

set _FLASHNAME $_CHIPNAME.flash

flash bank $_FLASHNAME at91sam7 0 0 0 0 $_TARGETNAME 0 0 0 0 0 0 0 18432

arm7_9 fast_memory_access enable

arm7_9 dcc_downloads enable

init

reset init

halt

2

I take it that you’re trying to flash the MCU with this script?

I’ve done a much stripped down version that appears to have worked all this weekend:

proc program_device () {
		halt 
		wait_halt 
		arm7_9 dcc_downloads enable 
		sleep 10 
		poll 
		flash probe 0 
		flash write_image erase unlock "main.bin" 0x00100000 
		sleep 10 
		reset run 
		sleep 10 
		shutdown
}
init 
reset init 
program_device ()

I currently run a seperate OpenOCD instance for debugging which uses the config for the interface (in my case openocd-0.4.0/tcl/interface/olimex-jtag-tiny.cfg)

and the target MCU (openocd-0.4.0/tcl/target/sam7x256.cfg) and a very small personal config containing the lines:

telnet_port 4444 
gdb_port 3333

That runs up and sits all happy waiting for me to goad it with telnet or gdb commands.