Has anybody gotten OpenOCD to work with an Atmel AT91SAM9G20?
I found a thread from about 6 months ago that indicated it was
partially working with an Amontek JTAG interface, but there
were problems and the thread contained no indication that the
problems had ever been resolved.
I'm trying to use an Olimex tiny with the 'G20 and I'm having
little luck. The Olimex interface worked fine with an Atmel
ATRM9200, so I know the hardware is OK and openocd/libftdi both
work.
If I attempt to connect to a the board (an Atmel AT92SAM9G20-EK
Rev B eval board), OpenOCD _occasionally_ finds the CPU, but it
usually complains like this:
Open On-Chip Debugger 0.1.0 (2009-06-29-11:11) Release
$URL:
https://kc8...@svn.berlios.de/svnroot/repos/openocd/tags/openocd-0.1.0/src/openocd.c
$
jtag_speed: 5
use of EmbeddedICE dbgrq instead of breakpoint for target halt enabled
Error: couldn't read the requested number of bytes from FT2232 device (19
81)
Error: couldn't read from FT2232
Error: number of discovered devices in JTAG chain (0) doesn't match
(enabled) configuration (1), total taps: 1
Error: check the config file and ensure proper JTAG communication
(connections, speed, ...)
Error: trying to validate configured JTAG chain anyway...
Warn : no tcl port specified, using default port
or like this:
Open On-Chip Debugger 0.1.0 (2009-06-29-11:11) Release
$URL:
https://kc8...@svn.berlios.de/svnroot/repos/openocd/tags/openocd-0.1.0/src/openocd.c
$
jtag_speed: 5
use of EmbeddedICE dbgrq instead of breakpoint for target halt enabled
Info : JTAG tap: at91sam9g20.cpu tap/device found: 0x0792603f (Manufacturer:
0x01f, Part: 0x7926, Version: 0x0)
Info : JTAG Tap/device matched
Warn : no tcl port specified, using default port
Warn : DBGACK set while target was in unknown state. Reset or initialize
target.
If I cycle power on the board immediately before starting
openocd it will connect sometimes (maybe 20% of the time):
Open On-Chip Debugger 0.1.0 (2009-06-29-11:11) Release
$URL:
https://kc8...@svn.berlios.de/svnroot/repos/openocd/tags/openocd-0.1.0/src/openocd.c
$
jtag_speed: 5
use of EmbeddedICE dbgrq instead of breakpoint for target halt enabled
Info : JTAG tap: at91sam9g20.cpu tap/device found: 0x0792603f (Manufacturer:
0x01f, Part: 0x7926, Version: 0x0)
Info : JTAG Tap/device matched
Warn : no tcl port specified, using default port
But then when I telnet in, it won't do anything useful.
Attempting to read memory fails with a device not halted
message, but the 'halt' command just hangs forever.
I'm now a bit stumped, and would appreciate the loan of a
clue...
The config I'm using was gleaned from various mailing list
postings:
# REFERENCE: http://www.olimex.com/dev/arm-usb-tiny.html
interface ft2232
ft2232_device_desc Olimex OpenOCD JTAG TINY
ft2232_layout olimex-jtag
ft2232_vid_pid 0x15ba 0x0004
#daemon configuration
telnet_port
gdb_port
set CHIPNAME at91sam9g20
set ENDIAN little
set CPUTAPID 0x0792603f
# chip
source [find target/at91sam9260.cfg]
jtag_speed 5
$_TARGETNAME configure -event reset-init {
# at reset chip runs at 32khz
jtag_khz 8
mww 0xfd08 0xa5000501 # RSTC_MR : enable user reset
mww 0xfd44 0x8000 # WDT_MR : disable watchdog
mww 0xfc20 0x4001 # CKGR_MOR : enable the main
oscillator
sleep 20 # wait 20 ms
mww 0xfc30 0x0001 # PMC_MCKR : switch to main
oscillator
sleep 10 # wait 10 ms
mww 0xfc28 0x2060bf09 # CKGR_PLLAR: Set PLLA Register
for 198,656MHz
sleep 20 # wait 20 ms
mww 0xfc30 0x0101 # PMC_MCKR : Select prescaler
sleep 10 # wait 10 ms
mww 0xfc30 0x0102 # PMC_MCKR : Clock from PLLA is
selected
sleep 10 # wait 10 ms
# Now run at anything fast... ie: 10mhz!
jtag_khz 1# Increase JTAG Speed to 6 MHz
arm7_9 dcc_downloads enable # Enable faster DCC downloads
}
#this chip has more sram
# Internal sram2 memory
$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x0020
-work-area-size 0x1000 -work-area-backup 1
#gdb
gdb_memory_map enable
arm7_9 dbgrq enable
Here's a debug log for the case that comes closest to working
(where the CPU is identified correctly). I then telnet in and
issue an mdb command and then a halt command. At that
point, openocd hangs and I kill it with Ctrl-C:
# openocd -d3
Open On-Chip Debugger 0.1.0 (2009-06-29-11:11) Release
$URL:
https://kc8...@svn.berlios.de/svnroot/repos/openocd/tags/openocd-0.1.0/src/openocd.c
$
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