Help on RT3052 Jtagging with DLC5 unbuffered cable

Development Boards MicroMod
1

Hello, good job!!

I have a bricked fonera 2303 .

I build a xilinx dcl5 unbuffered cable lpt , like this

https://wiki.openwrt.org/doc/hardware/p … unbuffered

I have to rewrite the uboot.bin to try to revive this doorstopper .

I tryed hooking up the jtag to the lpt port, but no luck for now.

I wired the TRST to the VCC of the header directly , is it correct?

I notice that if I remove the TRST-VCC joint the jtag dont seems to be recognized.(I tryed to put a 100ohm resistor between and the result is the same).

I used a working rt3052.cfg file changing only the interface section of the interface (since the former user was using a cable usb jtag name Lattice…).

This is my openocd rt3052.cfg file:

#RT3052.cfg 
set _CHIPNAME rt3052 
set _ENDIAN little 
set _CPUTAPID 0x1305224F 

#daemon configuration 
telnet_port 23 
gdb_port 3333 

#interface 
#interface ft2232 
#ft2232_device_desc "Lattice FTUSB Interface Cable A" 
#ft2232_layout olimex-jtag 
#ft2232_vid_pid 0x0403 0x6010 


## inizio mod cavo xilinx dlc5 

if { [info exists PARPORTADDR] } { 
   set _PARPORTADDR $PARPORTADDR 
} else { 
   set _PARPORTADDR 0 
} 

interface parport 
parport_port $_PARPORTADDR   #originale 
parport_cable dlc5 

## fine mod 


#jtag_speed 
adapter_khz 500 
#adapter_khz 100 

adapter_nsrst_delay 100 
jtag_ntrst_delay 100 
echo on 
# jtag scan chain 
# format L IRC IRCM IDCODE (Length, IR Capture, IR Capture Mask, IDCODE) 
jtag newtap $_CHIPNAME cpu -irlen 5 -ircapture 0x1 -irmask 0x3 -expected-id $_CPUTAPID 

set _TARGETNAME [format "%s.cpu" $_CHIPNAME] 
target create $_TARGETNAME mips_m4k -endian $_ENDIAN -chain-position $_TARGETNAME 

# flash size will be probed 
set _FLASHNAME $_CHIPNAME.flash 
# format flash bank name driver base size chip_width bus_width target 
flash bank $_FLASHNAME cfi 0xBF000000 8388608 2 2 $_TARGETNAME 

# flash bank $_FLASHNAME cfi 0x0 8388608 2 2 $_TARGETNAME 

echo "indirizzo parport "$_PARPORTADDR 

echo "allocating work area" 
$_TARGETNAME configure -work-area-phys 0x80040000 -work-area-size 4096 

echo "allocation complete" 
#Folloing code may not work, in that case you need to manually reset init 
#and manually load your u-boot.bin at starting address (0x0) of flash (not RAM). 
#starting Address of flash can be found in old dump of serial console or at ddwrt forum/openwrt forum 
$_TARGETNAME configure -event reset-init { 
#reset 
echo "halting the target!!!!!!!!!!!!!!!!!!!!!!!!!!!" 
halt 
echo "init SDRAM controller..........................@@@@@@@@@@@@@@@@@@@@" 
mww 0x10000300 0xd1825272 
mww 0x10000304 0xe0120300 
mww 0x1000030c 0x0511ffa1 

echo "Find flash..." 
flash probe 0 
echo "Load u-boot to RAM.." 
load_image uboot.bin 0x80000000 bin 
echo "Load u-boot to FLASH .." 

flash protect 0 0 10 off 
flash erase_sector 0 0 10 
flash write_bank 0 uboot.bin 0x0 


# resume 0x80000000 
}

I issued this command:

openocd -f new_rt3052.cfg -c "gdb_memory_map enable" -c "gdb_flash_program enable"

The execution stops at “allocation complete” and don’t go on , it hangs there with no errors.

I can reach the openocd telnet at the chosen port (23 in my rt3052.cfg file) but issuing a

flash probe 0

it give me an error of no flash recognized.

I m not really confident that the cable is working, how could I check it ? (some openocd commands)

Another thing, could you please share some commands for openocd flashing.

Thank you very much.