Re: [OpenOCD-user] Advice on Snapdragon 820

[Sergei A. <sa...@gm...>]

On 5 January 2017 at 18:59, Sergei Antonov <sa...@gm...> wrote:
> On 5 January 2017 at 10:11, Matthias Welwarsky <mat...@we...> wrote:
>> Hello Sergei,
>>
>> On Thursday 05 January 2017 01:25:35 Sergei Antonov wrote:
>>> Hello!
>>> I'd like to use OpenOCD with a development board containing a Qualcomm
>>> Snapdragon 820 (APQ8096) processor, its architecture is AArch64. Here
>>> is the scanned JTAG chain:
>>>
>>> Info : JTAG tap: auto0.tap tap/device found: 0x5ba00477 (mfg: 0x23b
>>> (ARM Ltd.), part: 0xba00, ver: 0x5)
>>> Info : JTAG tap: auto1.tap tap/device found: 0x000016dd (mfg: 0x36e
>>> (Certicom Corporation), part: 0x0001, ver: 0x0)
>>> Info : JTAG tap: auto2.tap tap/device found: 0x4003e0e1 (mfg: 0x070
>>> (Qualcomm), part: 0x003e, ver: 0x4)
>>>
>>> I suppose, I can debug device 0x5ba00477 as aarch64 target using
>>> development source code. What repo/branch of OpenOCD should I use?
>>> On Gerrit there are lots of patches for aarch64, I'm confused about
>>> what exactly is state-of-the-art or has best chances to work on my
>>> hardware.
>>
>> If you checkout http://openocd.zylin.com/#/c/3832, you get a pretty good base
>> for aarch64 debugging. You will also likely need this patch:
>>
>> http://openocd.zylin.com/#/c/3710 on top, you should be able to cherry-pick
>> it.
>
> Thanks, Matthias! I took c/3832, cherry-picked changes from c/3710,
> and added -ignore-syspwrupack to my .cfg. Unfortunately, target
> examination fails. Details are below.
>
> == openocd.cfg ==
> source [find interface/altera-usb-blaster.cfg]
> jtag newtap auto0 tap -irlen 4 -expected-id 0x5ba00477 -ignore-syspwrupack
> jtag newtap auto1 tap -irlen 5 -expected-id 0x000016dd
> jtag newtap auto2 tap -irlen 11 -expected-id 0x4003e0e1
> target create target0 aarch64 -endian little -chain-position auto0.tap
> init
>
> == Relevant part of debug output ==
> Debug: 193 21 core.c:1399 jtag_init_inner(): Init JTAG chain
> Debug: 194 21 core.c:327 jtag_call_event_callbacks(): jtag event: TAP reset
> Debug: 195 21 core.c:1060 jtag_examine_chain(): DR scan interrogation
> for IDCODE/BYPASS
> Debug: 196 21 core.c:327 jtag_call_event_callbacks(): jtag event: TAP reset
> Info : 197 29 core.c:959 jtag_examine_chain_display(): JTAG tap:
> auto0.tap tap/device found: 0x5ba00477 (mfg: 0x23b (ARM Ltd.), part:
> 0xba00, ver: 0x5)
> Info : 198 29 core.c:959 jtag_examine_chain_display(): JTAG tap:
> auto1.tap tap/device found: 0x000016dd (mfg: 0x36e (Certicom
> Corporation), part: 0x0001, ver: 0x0)
> Info : 199 29 core.c:959 jtag_examine_chain_display(): JTAG tap:
> auto2.tap tap/device found: 0x4003e0e1 (mfg: 0x070 (Qualcomm), part:
> 0x003e, ver: 0x4)
> Debug: 200 29 core.c:1190 jtag_validate_ircapture(): IR capture validation scan
> Debug: 201 34 core.c:1248 jtag_validate_ircapture(): auto0.tap: IR capture 0x01
> Debug: 202 34 core.c:1248 jtag_validate_ircapture(): auto1.tap: IR capture 0x01
> Debug: 203 34 core.c:1248 jtag_validate_ircapture(): auto2.tap: IR capture 0x1
> Debug: 204 34 openocd.c:148 handle_init_command(): Examining targets...
> Debug: 205 34 target.c:1513 target_call_event_callbacks(): target
> event 21 (examine-start)
> Debug: 206 34 arm_adi_v5.c:603 dap_dp_init():
> Debug: 207 34 arm_adi_v5.c:636 dap_dp_init(): DAP: wait CDBGPWRUPACK
> Debug: 208 34 arm_adi_v5.h:432 dap_dp_poll_register(): DAP: poll 4,
> mask 0x20000000, value 0x20000000
> Debug: 209 135 arm_adi_v5.c:789 dap_find_ap(): Found APB-AP at AP
> index: 1 (IDR=0x44770002)
> Debug: 210 173 adi_v5_jtag.c:572 jtagdp_transaction_endcheck():
> jtag-dp: CTRL/STAT 0x70000021
> Error: 211 173 adi_v5_jtag.c:584 jtagdp_transaction_endcheck():
> JTAG-DP STICKY ERROR
> Error: 212 178 aarch64.c:1825 aarch64_examine_first(): Could not
> initialize the APB-AP
> Debug: 213 178 openocd.c:150 handle_init_command(): target examination failed

The first time I try to connect after rebooting the device, behavior
is different (though examination fails anyway):

Debug: 206 35 arm_adi_v5.c:603 dap_dp_init():
Debug: 207 35 arm_adi_v5.c:636 dap_dp_init(): DAP: wait CDBGPWRUPACK
Debug: 208 35 arm_adi_v5.h:432 dap_dp_poll_register(): DAP: poll 4,
mask 0x20000000, value 0x20000000
Debug: 209 136 arm_adi_v5.c:789 dap_find_ap(): Found APB-AP at AP
index: 1 (IDR=0x44770002)
Debug: 210 174 arm_adi_v5.c:716 mem_ap_init(): MEM_AP Packed Transfers: disabled
Debug: 211 174 arm_adi_v5.c:727 mem_ap_init(): MEM_AP CFG: large data
0, long address 0, big-endian 0
Error: 212 3761 adi_v5_jtag.c:450 jtagdp_overrun_check(): Timeout
during WAIT recovery
Error: 213 3780 arm_adi_v5.c:845 dap_lookup_cs_component(): Can't read
component with base address 0x80030000, the corresponding core might
be turned off
Debug: 214 3780 openocd.c:150 handle_init_command(): target examination failed