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  • Case ID: 340557
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No RTT output when enabling mcuboot

mackz

I am working on a custom board featuring a nrf9160, when i run the zephyr hello_world application with:

CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y 
CONFIG_SEGGER_RTT_BUFFER_SIZE_UP=4096
CONFIG_LOG_MODE_IMMEDIATE=y

Everything works and i can see the output in JLinkRTTViewer. But when i enable:


CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_MCUBOOT_BOOTUTIL_LIB=y

i get no output at all. The application seems to be running since i can see the current consumption changing.


I found this: Cannot see both bootloader and application RTT output #53544 Closed which seems to be an issue with only being able to see either mcuboot logs or applications logs which is not really the case for me. I cant see anything.

But i tried to add the patches suggested by giansta but it still does not work. This is part of what i got from objdump on the .elf file:

objdump -t zephyr.elf | grep RTT
2000c568 l    d  _RTT_SECTION_NAME      00000000 _RTT_SECTION_NAME
00000000 l    df *ABS*  00000000 SEGGER_RTT.c
2000c578 l     O _RTT_SECTION_NAME      00001000 _acUpBuffer
2000c568 l     O _RTT_SECTION_NAME      00000010 _acDownBuffer
2000c568 l       _RTT_SECTION_NAME      00000000 $d
00000000 l    df *ABS*  00000000 SEGGER_RTT_zephyr.c
00000001 g     O *ABS*  00000000 CONFIG_SEGGER_RTT_SECTION_CUSTOM
0002843d g     F text   00000058 SEGGER_RTT_WriteNoLock
000284d9 g     F text   00000030 SEGGER_RTT_Init
00000000 g     O *ABS*  00000000 CONFIG_SEGGER_RTT_MODE
2000c568 g       _RTT_SECTION_NAME      00000000 __rtt_buff_data_start
00000001 g     O *ABS*  00000000 CONFIG_SEGGER_RTT_SECTION_CUSTOM_NAME
2000c580 g       _RTT_SECTION_NAME      00000000 _image_ram_start
2000d578 g     O _RTT_SECTION_NAME      000000a8 _SEGGER_RTT
2000d620 g       _RTT_SECTION_NAME      00000000 __rtt_buff_data_end


I have also tried to disable logs from mcuboot by adding a child_image/mcuboot.conf with:

CONFIG_USE_SEGGER_RTT=n
CONFIG_LOG_BACKEND_RTT=n
CONFIG_MCUBOOT_UTIL_LOG_LEVEL_OFF=y
CONFIG_LOG=n

but this also did not work.

I am on Ubuntu 22.04.5 LTS
using nrf connect sdk 2.6.1 and J Link V7.94i.

Parents
  • 0

    Hi,

    Can you start by verifying that the application is actually started? For instance by toggling a GPIO, or checking something else that is observable from the outside?

    Other than that, RTT is tricky because it uses a buffer in RAM that is allocated build time, so it will typically move when you re-build the application. Therefore, you normally always need to open the RTT viewer again after flashign new firmware. (The RTT viewer seraches for a magic pattern, and decides on where the buffer is. It will not serch again automatically unless you re-open it).

  • 0 in reply to Einar Thorsrud

    I have confirmed that the application actually is started, i am reopening and reconnecting each time after flashing the device but I still get no output I even tried to set the adress manually from the output that I got from the objdump.

  • 0 in reply to mackz

    This is what i get when i connect via JLinkRTTViewer:
    LOG: Cortex-M: The connected J-Link (S/N 1050014356) uses an old firmware module: V1 (current is 2)
    LOG: Cortex-M (ARMv8-M and later): The connected J-Link (S/N 1050014356) uses an old firmware module that does not handle I/D-cache correctly. Proper debugging functionality cannot be guaranteed if cache is enabled
    LOG: FPUnit: 8 code (BP) slots and 0 literal slots
    LOG: Security extension: implemented
    LOG: Secure debug: enabled
    LOG: CoreSight components:
    LOG: ROMTbl[0] @ E00FF000
    LOG: [0][0]: E000E000 CID B105900D PID 000BBD21 DEVARCH 47702A04 DEVTYPE 00 Cortex-M33
    LOG: [0][1]: E0001000 CID B105900D PID 000BBD21 DEVARCH 47701A02 DEVTYPE 00 DWT
    LOG: [0][2]: E0002000 CID B105900D PID 000BBD21 DEVARCH 47701A03 DEVTYPE 00 FPB
    LOG: [0][3]: E0000000 CID B105900D PID 000BBD21 DEVARCH 47701A01 DEVTYPE 43 ITM
    LOG: [0][5]: E0041000 CID B105900D PID 002BBD21 DEVARCH 47724A13 DEVTYPE 13 ETM
    LOG: [0][6]: E0042000 CID B105900D PID 000BBD21 DEVARCH 47701A14 DEVTYPE 14 CSS600-CTI
    LOG: RTT Viewer connected.

    But i get no output.


    I am using a nrf5340dk to communicate with the nrf9160.

  • 0 in reply to mackz

    I see. Can you dump the RAM of the device and search for the RTT buffer in it (see this post)? Do you find the magic string marking the start of the RTT buffer? Do you find only one instance or multiple? And does it work if you explicitly configure the RTT viewer to look in that address?

Reply Children
  • 0 in reply to Einar Thorsrud

    nrfjprog --memrd 0x20000000 --n 0x40000 > full_ram_dump.txt i ran this

    and then used ctrl + F with "SE" and "RT" but could not find the magic string.

  • 0 in reply to mackz

    I see. Can you share the exact project you are using with your changes? I ask because I am not able to reproduce. If I use the unmodified hello_world sample from SDK 2.6, and add this to prj.conf:

    CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_SEGGER_RTT_BUFFER_SIZE_UP=4096
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_PRINTK=y
CONFIG_UART_CONSOLE=n
CONFIG_CONSOLE=y
CONFIG_RTT_CONSOLE=y

CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_MCUBOOT_BOOTUTIL_LIB=y

    I get this RTT output:

    SEGGER J-Link V8.12c - Real time terminal output
SEGGER J-Link (unknown) V1.0, SN=960061150
Process: JLinkExe
Hello World! nrf9160dk_nrf9160
*** Booting nRF Connect SDK v3.5.99-ncs1-2 ***

    Note that there is a difference in the config here, as with your config, the printf is not forwarded ot RTT (but you should stil see the bot banner ("*** Booting nRF Connect SDK v3.5.99-ncs1-2 ***"), and I do that if I test your exact configuration).

  • 0 in reply to Einar Thorsrud

    It works for me aswell if i run it on nrf9160 devkit. It is on the custom board it is not working. I tried to copy your conf but still could not get any output. build.tar.gz

    I have included my build folder that is not working.

    If i try to run the build for the custom board on the devkit i can see in serial terminal that i get:

    [Sec Thread] Secure image initializing!
TF-M isolation level is: 0x00000001
Booting TF-M v2.0.0
FATAL ERROR: SecureFault
Here is some context for the exception:
    EXC_RETURN (LR): 0xFFFFFFBD
    Exception came from non-secure FW in thread mode.
    xPSR:    0x60000007
    MSP:     0x20000BF8
    PSP:     0x200018B8
    MSP_NS:  0x2000E770
    PSP_NS:  0x2000E590
    Exception frame at: 0x2000E590
        R0:   0x40000105
        R1:   0x020103F5
        R2:   0x2000E660
        R3:   0x2000E688
        R12:  0x00019850
        LR:   0x0001B78F
        PC:   0x00007C20
        xPSR: 0x61000000
    Callee saved register state:        R4:   0x00007C21
        R5:   0x40000105
        R6:   0x020103F5
        R7:   0x2000E660
        R8:   0x00000000
        R9:   0x00019850
        R10:  0x00019850
        R11:  0x00019850
    CFSR:  0x00000000
    BFSR:  0x00000000
    BFAR:  Not Valid
    MMFSR: 0x00000000
    MMFAR: Not Valid
    UFSR:  0x00000000
    HFSR:  0x00000000
    SFSR:  0x00000001
    SFAR: Not Valid

    repeatedly.

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