Re: [OpenOCD-user] WRT54GL (BCM5352e based) won't halt

[Brendan Dolan-G. <bre...@ga...>]

After updating to the latest git master, I noticed that OpenOCD now
comes with a Linksys WRT54GL config by default. With that I have
managed to get some slightly different output, including something
that resembles the correct PC and register contents. But the target
still does not actually halt, and instead reboots itself.

$ telnet localhost 4444
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Open On-Chip Debugger
> halt
Error writing unexpected address 0xff202004
DMA time out
DMA Read Addr = 0ff30008  Data = ERROR ON READ
target state: halted
target halted in MIPS32 mode due to debug-request, pc: 0x80003054
> reg
===== mips32 registers
(0) zero (/32): 0x00000000
(1) at (/32): 0x00000000
(2) v0 (/32): 0x00000000
(3) v1 (/32): 0x8018F34C
(4) a0 (/32): 0x00000019
(5) a1 (/32): 0x00000000
(6) a2 (/32): 0x1000FC01
(7) a3 (/32): 0xFFFF00FF
(8) t0 (/32): 0x8015FFE0
(9) t1 (/32): 0x0000FC00
(10) t2 (/32): 0x00000000
(11) t3 (/32): 0x80E0B41C
(12) t4 (/32): 0x00000030
(13) t5 (/32): 0x00000006
(14) t6 (/32): 0x19999999
(15) t7 (/32): 0x00000000
(16) s0 (/32): 0x80341E70
(17) s1 (/32): 0x00000000
(18) s2 (/32): 0x803029FC
(19) s3 (/32): 0x43464531
(20) s4 (/32): 0x00000002
(21) s5 (/32): 0x00000400
(22) s6 (/32): 0x00000001
(23) s7 (/32): 0x00000400
(24) t8 (/32): 0x00000000
(25) t9 (/32): 0x2AC716E0
(26) k0 (/32): 0x8015FF58
(27) k1 (/32): 0x8015FF58
(28) gp (/32): 0x8015E000
(29) sp (/32): 0x8015FF58
(30) fp (/32): 0x00000000
(31) ra (/32): 0x80003070
(32) status (/32): 0x1000FC01
(33) lo (/32): 0x00000BC0
(34) hi (/32): 0x00000000
(35) badvaddr (/32): 0xC0074298
(36) cause (/32): 0x00008400
(37) pc (/32): 0x80003054
> reset halt
JTAG tap: bcm5352e.cpu tap/device found: 0x0535217f (mfg: 0x0bf, part:
0x5352, ver: 0x0)
timed out while waiting for target halted
TARGET: bcm5352e.cpu - Not halted

in procedure 'reset'
Halt timed out, wake up GDB.
>

I have also attached a log generated with the "-d" option.

Thanks,
Brendan

On Tue, Feb 11, 2014 at 8:44 PM, Brendan Dolan-Gavitt
<bre...@ga...> wrote:
> Hi,
>
> I'm trying to use OpenOCD to talk to a Linksys WRT54GL via a
> Flyswatter2. OpenOCD correctly reads the JTAG ID of the device
> (0x0535217f), but I can't seem to get it to halt the target. Just
> issuing "halt" causes the device to reboot. A "reset halt" doesn't
> reboot the device, but it times out. Here's the OpenOCD output when
> starting it with "sudo src/openocd -s tcl -f interface/flyswatter2.cfg
> -f target/bcm5352e.cfg":
>
> === BEGIN OPENOCD OUTPUT ===
> $ telnet localhost 4444
> Trying 127.0.0.1...
> Connected to localhost.
> Escape character is '^]'.
> Open On-Chip Debugger
>> halt
> target state: halted
> target halted in MIPS32 mode due to debug-request, pc: 0x00000000
>> targets
>     TargetName         Type       Endian TapName            State
> --  ------------------ ---------- ------ ------------------ ------------
>  0* bcm5352e.cpu       mips_m4k   little bcm5352e.cpu       running
>> reset halt
> JTAG tap: bcm5352e.cpu tap/device found: 0x0535217f (mfg: 0x0bf, part:
> 0x5352, ver: 0x0)
> Halt timed out, wake up GDB.
> timed out while waiting for target halted
> TARGET: bcm5352e.cpu - Not halted
>
> in procedure 'reset'
>>
> === END OPENOCD OUTPUT ===
>
> Any ideas? My config files are pasted below.
>
> Thanks,
> Brendan
>
> === BEGIN flyswatter2.cfg ===
> #
> # TinCanTools Flyswatter 2
> #
> # http://www.tincantools.com/product.php?productid=16153
> #
>
> interface ft2232
> ft2232_device_desc "Flyswatter2"
> ft2232_layout "flyswatter2"
> ft2232_vid_pid 0x0403 0x6010
> adapter_khz 6000
> === END flyswatter2.cfg ===
>
> === BEGIN bcm5352e.cfg ===
> set _CHIPNAME bcm5352e
> set _CPUID 0x0535217f
>
> jtag newtap $_CHIPNAME cpu -irlen 8 -ircapture 0x1 -irmask 0x1f
> -expected-id $_CPUID
>
> set _TARGETNAME $_CHIPNAME.cpu
> target create $_TARGETNAME mips_m4k -endian little -chain-position $_TARGETNAME
> == END bcm5352e.cfg ===