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AM2634 : Debugger Cannot Read Any MPU Registers

Kier
Mastermind 8075 points
Other Parts Discussed in Thread: AM2631, SYSCONFIG

Hello,

The debugger is unable to read the MPU registers. e.g. MPU_L2OCRAM_BANK0_PROGRAMMABLE_1_START_ADDRESS

Why is that please?

  • 0
    TI__Guru*** 135135 points

    Hello Kier,

    I was hoping to find some preliminary information for you on this but I was not able to and need to defer to our MPU expert who, as I mentioned on your other post regarding the MPU, is currently out of office. Sorry for the delay in support.

    Best Regards,

    Ralph Jacobi

  • 0 in reply to Ralph Jacobi
    TI__Mastermind 49275 points

    Hi Kier,

    It could be caused by one of the two following issues:

    1. The incorrect CCXML:

    I am using the CCS 12.4.0 and AM263x CC with the above settings. The MPU registers look OK:

    2. The incorrect MPU settings in example.syscfg:

    I am using the nortos empty project, the MPU registers look OK:

    Best regards,

    Ming

  • 0 in reply to Ming Wei
    Mastermind 8075 points

    Hi Ming,

    Thanks for the reply.

    Ming Wei said:
    1. The incorrect CCXML:

    Do you mean incorrect settings in the CCXML?

    I started with the empty project. It contained AM2631.ccxml. This seemed reasonable to me but I changed the board selection to AM263x_CC like yours but this made no difference.

    Ming Wei said:
    2. The incorrect MPU settings in example.syscfg:

    I'm assuming the empty project from TI has the correct settings. How would I know I had incorrect settings if I cannot view the registers? Maybe I misunderstand your point.

    Please find attached my empty project. Can you check if you can see the MPU registers with my project please? If so, then I would like help to debug why I cannot see the MPU registers on my PC/EVM board.

    Thank you.empty_am263x-cc_r5fss0-0_nortos_ti-arm-clang.zip

  • 0 in reply to Aakash Kedia
    Mastermind 8075 points

    Hi Aakash,

    Aakash Kedia said:
    Also what is the boot mode that you are using ?

    I'm using Dev Boot mode. Since I'm not using any kind of image, is the the first part of your request still relevant in this case?

  • 0 in reply to Kier
    TI__Mastermind 26025 points

    Hi ,

    Can you please share the first part of request as well ?

    Best Regards,
    Aakash

  • 0 in reply to Aakash Kedia
    Mastermind 8075 points

    Hi Aakash,

    Sorry but I'm not familiar with UART boot mode.

    Does it require connection via UART1? If so, I don't have a USB to UART cable with me. I'll have to try it when I'm in the office.

  • 0 in reply to Kier
    TI__Mastermind 26025 points

    Hi Kier,

    Please check this documentation - https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/latest/exports/docs/api_guide_am263x/EVM_SETUP_PAGE.html#BOOTMODE_UART to enable the UART boot mode and get the RBL meta data prints.

    Best Regards,
    Aakash

  • 0 in reply to Aakash Kedia
    Mastermind 8075 points

    Hi Aakash,

    The first attempt complained of "binascii.Error: Odd-length string" so I deleted character 'C' from Data.txt. The next attempt seemed to produce something which is attached.

    parsed.txt
    Fullscreen
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
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    ---------------------------
    SoC ID HW Info:
    ---------------------------
    partID : 0x0
    partNumber : 0x2
    PGVer : 0x2
    ROMVer : 0x1
    MetalVer : 0x0
    ---------------------------
    SoC ID R5 ROM Info:
    ---------------------------
    r5 ROM Ver : 0x10000
    ---------------------------
    SoC ID HSM Pub ROM Info:
    ---------------------------
    devName : AM263X
    devType : 0xabcd0004 --> HS_FS
    hsm ROM Ver : 0x10000
    ---------------------------
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  • 0 in reply to Kier
    Mastermind 8075 points

    Hi Aakash,

    What's the verdict on the RBL string please?

    I take it your line of thinking is that MPU registers are masked due to some security setting that is local to my EVM?

  • 0 in reply to Kier
    TI__Mastermind 26025 points

    Hi Kier,

    Kier said:
    I take it your line of thinking is that MPU registers are masked due to some security setting that is local to my EVM?

    This is correct.

    The device you have is PGVer : 0x2 which is not supported for security hence you cannot use MPU Firewalls on this device. You need to get the PGVer : 0x3 or SR1.1 device of AM263x. Also you should be using SBLs instead of GELs which will load the TIFS firmware on the device in order to use the MPU features.

    Best Regards,
    Aakash

  • 0 in reply to Aakash Kedia
    Mastermind 8075 points

    Thank you but this raises more questions than it answers.

    1) So I can configure and use the MPU (through SYSCONFIG) but I can't monitor the MPU registers, is that correct?

    2) Regarding "PGVer : 0x3" etc., how might I get these particular devices then? Are they available on a particular EVM that I can buy? More data required please.

    3) Why doesn't the TRM mention any of this?

  • 0 in reply to Kier
    TI__Mastermind 26025 points

    Hi Kier,

    Kier said:
    So I can configure and use the MPU (through SYSCONFIG) but I can't monitor the MPU registers, is that correct?

    What you can configure via syscfg is ARMv7r MPU not the System MPU Firewall which is part of Security.

    Kier said:
    2) Regarding "PGVer : 0x3" etc., how might I get these particular devices then? Are they available on a particular EVM that I can buy? More data required please

    Can you reach out to your TI representative ? In our current inventory, we have SR1.1 devices available and are ordered by default.

    Kier said:
    3) Why doesn't the TRM mention any of this?

    System MPU Firewalls and its information are part of HSM Security Addendum, which is disclosed to customers after the NDA is in place. The access mechanism for the same is My Secure SW.

    Best Regards,
    Aakash

  • 0 in reply to Aakash Kedia
    Mastermind 8075 points

    Hi Aakash,

    The original question is to do with ARMv7r MPU. For some reason you've assumed the question is to do with System MPU Firewall.

    My original post mentions MPU_L2OCRAM_BANK0_PROGRAMMABLE_1_START_ADDRESS. As you have confirmed, it can be configured with SYSCONFIG so what is the reason I cannot see it in the debugger?

    Please confine your answer to ARMv7r MPU.

  • 0 in reply to Ming Wei
    Mastermind 8075 points

    Please can you try my empty project attached?

    Do you have a special version of the AM263x_CC or is it off the shelf?

    Thank you.

  • +1 in reply to Kier
    TI__Mastermind 26025 points

    Hi ,

    Kier said:
    My original post mentions MPU_L2OCRAM_BANK0_PROGRAMMABLE_1_START_ADDRESS.

    This is System MPU Firewall.

    For ARMv7 MPUs, you need to check in the Core Registers.

    Best Regards,
    Aakash

  • 0 in reply to Aakash Kedia
    Mastermind 8075 points

    Thanks for the clarification.

    Aakash Kedia said:
    System MPU Firewalls and its information are part of HSM Security Addendum, which is disclosed to customers after the NDA is in place. The access mechanism for the same is My Secure SW.

    It would save a lot of time if the TRM mentioned this in "3.8 Memory Protection Units (MPU)". Without it, the TRM gives the impression that these registers are accessible in the same way as any other.