• State Not Answered
  • Locked Locked
  • Replies 3 replies
  • Subscribers 350 subscribers
  • Views 15566 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Arm Trusted firmware as bootloader for A53

segfault

Hi,

I can build bl31.bin for my i.MX8QM EVK (Arm Trusted Firmware open source reference) which can act as an Armv8-A bootloader.

I am NOT intending to include any u-boot binary in my test image.  Is this possible ?

Can anyone suggest how to build a Cortex-A53 test image for i.MX8QM EVK with bl31.bin as the bootloader ? Any documentation or information ?

Thanks

  • 0

    Following up with more info:

    I'm able to boot the imx8qm using Arm Trusted FW and start an A53 core without u-boot. Just used the scfw_tcm.bin,  mx8qm-ahab-container.img and bl31.bin to boot it. The debug console (for bl31) looks like this:

    -- 0x1bffffff
    NOTICE: Memreg 2 0x34000000 -- 0x37ffffff
    NOTICE: Memreg 3 0x38000000 -- 0x3bffffff
    NOTICE: Memreg 4 0x60000000 -- 0x6fffffff
    NOTICE: Memreg 5 0x70000000 -- 0x7fffffff
    NOTICE: Memreg 6 0x80000000 -- 0xffffffff
    NOTICE: Memreg 7 0x400000000 -- 0x43fffffff
    NOTICE: Memreg 8 0x880000000 -- 0x97fffffff
    NOTICE: Non-secure Partitioning Succeeded
    NOTICE: BL31: v2.3():
    NOTICE: BL31: Built : 15:21:46, Aug 24 2020
    INFO: GICv3 with legacy support detected.
    INFO: ARM GICv3 driver initialized in EL3
    INFO: BL31: Initializing runtime services
    INFO: BL31: cortex_a53: CPU workaround for 855873 was applied
    INFO: BL31: Preparing for EL3 exit to normal world
    INFO: Entry point address = 0x80020000
    INFO: SPSR = 0x3c9

    Can someone explain the "Entry point address" ? Is it possible to launch secondary BL or app or other A53 cores ? Any examples ?

    Thanks

  • 0 Arm Employee Badge in reply to segfault

    > Is it possible to launch secondary BL or app or other A53 cores ? Any examples ?

    Yes, you can boot the secondary BL on other CA53 cores.  Actually Arm Trusted Firmware is a good example for MP core booting.

      - git.trustedfirmware.org/.../

      -