SIM_SDID reads 0 after mass erase

[bm31416]

Hi *,

I am using MCU_Link and openocd to flash mkv31f devices. I've noticed that after I perform a mass erase the value of SIM_SDID is 0.

I read this value using the debugger and openocd.

If the chip has a valid image, the expected value is read back.

Is this the expected behavior? Isn't this register read only?

[Update 2024-05-27]:

When I run the command dap info from open ocd I get the answer:

AP ID register 0x24770011
Type is MEM-AP AHB3
MEM-AP BASE 0xe00ff003
Valid ROM table present
Component base address 0xe00ff000
Can't read component, the corresponding core might be turned off 

[Pablo_Ramos]

Hi @bm31416 ,
I test your issue using an FRDM-KV31F and the value of the SIM_SDID isn't 0, the way I test it is the following:

Use the erase flash action that MCUXpresso have (I use PEMicro because of the bootloader please check which one do you have)

Pablo_Ramos_0-1717535948179.png

Once the flash is erased use the Attach to running target option.

Pablo_Ramos_2-1717535977989.png

With this you should be able to see the memory via MCUXpresso even though the flash is empty.

Search the SIM_SDID with the address of the Reference Manual

Pablo_Ramos_3-1717535984937.png

Knowing that I was using an MKV31F512 the lasts bits match the register of the SIM_SDID
0011 0001 0110 or 316

Pablo_Ramos_5-1717536023801.png

Try this method.
Hope it help you!

[bm31416]

Thanks for the support here.

I see two main differences between the two setups: Debugger and Software. I don't know the details of how openOcd erases the memory, but I do know it is erased afterwards.

My assumption is that MCUExpresso sets some other HW registers which allow/activate the reading of the SIM_ID.

Would be possible to share the logfile of the reading process from the MCUExpresso... maybe there is listed all the necessary steps.

Thanks in advance

[Pablo_Ramos]

Hi @bm31416 ,
There is no log file of the reading process because this a tool that is directly on MCUXpresso but I can share you the erase log file, I'm using P&E so this log file may change.

Executing flash operation 'Erase' (Erase flash) - Wed Jun 05 09:51:24 CST 2024
Checking MCU info...
Scanning for targets...
Executing flash action...
P&E GDB Server for Arm(R) devices, Version 9.45.00.00
Copyright 2018, P&E Microcomputer Systems Inc, All rights reserved
Loading library C:\nxp\MCUXpressoIDE_11.9.1_2170\ide\plugins\com.pemicro.debug.gdbjtag.pne_5.7.8.202404031741\win32\gdi\unit_ngs_arm_internal.dll ... Done.
Command line arguments: -device=NXP_KVx_KV31F512M12 -startserver -singlesession -serverport=7225 -gdbmiport=6225 -interface=OPENSDA -speed=5000 -port=USB1 -streamingport=10224 -configfile=C:/workspace/MCUXpresso11.9.1/.metadata/.plugins/com.pemicro.debug.gdbjtag.pne/config.ini -programmingtype=3 -flashobjectfile=C:\workspace\MCUXpresso11.9.1\frdmkv31f_led_blinky_aaaaah\Debug\frdmkv31f_led_blinky_aaaaah.axf -quitafterprogramming
Config file selected: C:/workspace/MCUXpresso11.9.1/.metadata/.plugins/com.pemicro.debug.gdbjtag.pne/config.ini
Device selected is NXP_KVx_KV31F512M12
User Specified Hardware Selection : Interface=OPENSDA and Port=USB1
Connecting to target.
Unable to load libusb0.dll
OpenSDA detected - Flash Version 1.18
Device is NXP_KVx_KV31F512M12.
Mode is In-Circuit Debug.
(C)opyright 2012, P&E Microcomputer Systems, Inc. (www.pemicro.com)
API version is 101
TARGET XML PATH is C:\nxp\MCUXpressoIDE_11.9.1_2170\ide\plugins\com.pemicro.debug.gdbjtag.pne_5.7.8.202404031741\supportFiles_ARM\target_v7m_vfp.xml
Server 1 running on 127.0.0.1:7225
Server 2 running on 127.0.0.1:7227
Server 3 running on 127.0.0.1:7229
Server 4 running on 127.0.0.1:7231
Server 5 running on 127.0.0.1:7233
Server 6 running on 127.0.0.1:7235
Server 7 running on 127.0.0.1:7237
Server 8 running on 127.0.0.1:7239
Server 9 running on 127.0.0.1:7241
Server 10 running on 127.0.0.1:7243
Server 11 running on 127.0.0.1:6225
Unable to load libusb0.dll
Copyright 2024 P&E Microcomputer Systems,Inc.
Command Line :C:\nxp\MCUXpressoIDE_11.9.1_2170\ide\plugins\com.pemicro.debug.gdbjtag.pne_5.7.8.202404031741\win32\pegdbserver_console -device=NXP_KVx_KV31F512M12 -startserver -singlesession -serverport=7225 -gdbmiport=6225 -interface=OPENSDA -speed=5000 Ð
OpenSDA detected - Flash Version 1.18
CMD>RE
Initializing.
Target has been RESET and is active.
CMD>CM C:\nxp\MCUXpressoIDE_11.9.1_2170\ide\plugins\com.pemicro.debug.gdbjtag.pne_5.7.8.202404031741\supportFiles_ARM\NXP\KVx\freescale_kv31f512m12_1x32x128k_pflash.arp
Initializing.
Initialized.
;version 1.06, 05/18/2017, Copyright 2017 P&E Microcomputer Systems, Inc. All rights reserved. www.pemicro.com [kv_31f512_n_pflash]
;device freescale, kv31f512m12, 1x32x128k, desc=pflash
;begin_cs device=$00000000, length=$00080000, ram=$20000000
Loading programming algorithm ...
Inaccessible blocks ...
block 0007E000-0007FFFF : Flash Access Control Enabled
Programming sequency is : erase only
CMD>EO
Erasing ranges ...
Range 00000000-00001FFF
Erased successfully.
CMD>RE
Initializing.
Target has been RESET and is active.
All Servers Running
Target Disconnected.

There is a chance where you can try to read the SIM_SDID in the way I explain before? this in order to narrow more what could be the issue.