RE: [PATCHv2 0/7] hw/arm: Adding Cortex-M7 Asym metric Multiprocessing boot support for i.MX8MP

Bernhard Beschow <[email protected]>
Newsgroups org.nongnu.qemu-devel
Message-ID <[email protected]> 

Am 23. August 2026 12:02:22 UTC schrieb Bernhard Beschow <[email protected]>:
>
>
>Am 11. August 2026 04:47:40 UTC schrieb Gaurav Sharma <[email protected]>:
>>ping
>>
>>> -----Original Message-----
>>> From: Gaurav Sharma <[email protected]>
>>> Sent: 24 July 2026 09:32
>>> To: Gaurav Sharma <[email protected]>; [email protected]
>>> Cc: [email protected]; [email protected]; Bernhard Beschow
>>> <[email protected]>
>>> Subject: RE: [PATCHv2 0/7] hw/arm: Adding Cortex-M7 Asymmetric
>>> Multiprocessing boot support for i.MX8MP
>>> 
>>> Ping
>
>Hi Gurav,
>
>I finally could test your series. I built Buildroot's freescale_imx8mpevk_defonfig (v2026.05) which has the required kernel options already enabled and passed imx8mp-evk-rpmsg.dtb to QEMU. QEMU starts successfully. However, when attempting to load an .elf image to remoteproc0/firmware, I get:
>
>    # echo zephyr.elf > /sys/devices/platform/imx8mp-cm7/remoteproc/remoteproc0/firm
>ware 
>    [  887.325597] imx-rproc imx8mp-cm7: can't change firmware while running
>    sh: write error: Device or resource busy
>
>Checking the state results in:
>
>    # cat /sys/devices/platform/imx8mp-cm7/remoteproc/remoteproc0/state 
>    attached
>
>I didn't dig into the Linux kernel sources to investigate this further. Do you have an idea of what is missing?

Okay, I missed the -mmio change as well as the reserved regions: https://docs.nxp.com/bundle/AN5317/page/topics/imx_linux_rproc_support.html . Fixed.

Then I set up MCUXpresso following this guide: https://mcuxpresso.nxp.com/mcuxsdk/latest/html/gsd/repo_setup.html

With an ARM eabi toolchain provided by my distrubution I created the .elf file:

    west build -b evkmimx8mp examples/driver_examples/uart/polling/ --config ddr_release

With the apporpriate .dtb I get in Buildroot guest:

    # modprobe rpmsg_char
    # echo uart_polling_cm7.elf > /sys/devices/platform/imx8mp-cm7/remoteproc/remoteproc0/firmware 
    # echo start > /sys/devices/platform/imx8mp-cm7/remoteproc/remoteproc0/state 
    [   52.182388] remoteproc remoteproc0: powering up imx-rproc
    [   52.195672] remoteproc remoteproc0: Direct firmware load for uart_polling_cm7.elf failed with error -2
    [   52.195895] remoteproc remoteproc0: Falling back to sysfs fallback for: uart_polling_cm7.elf
    [  113.748324] remoteproc remoteproc0: request_firmware failed: -110
    [  113.755836] remoteproc remoteproc0: Boot failed: -110
    sh: write error: Connection timed out

Any ideas?

Best regards,
Bernhard

>
>Note that I built Zephyr's imx8mp_evk for the M7 [1] which produces zephyr.elf. Does the series provide everything to use Zephyr or do we need to add ITCM memory? Adding a dedicated memory map including ITCM for the M7 core doesn't seem too complicated. Using Zephyr may allow for having a functional test in our CI, though of course binary images had to be provided.
>
>Best regards,
>Bernhard
>
>[1] https://docs.zephyrproject.org/latest/boards/nxp/imx8mp_evk/doc/index.html#programming-and-debugging-m7
>
>
>>> 
>>> > -----Original Message-----
>>> > From: Gaurav Sharma <[email protected]>
>>> > Sent: 06 July 2026 21:59
>>> > To: [email protected]
>>> > Cc: [email protected]; [email protected]; Gaurav Sharma
>>> > <[email protected]>
>>> > Subject: [PATCHv2 0/7] hw/arm: Adding Cortex-M7 Asymmetric
>>> > Multiprocessing boot support for i.MX8MP
>>> >
>>> > Changes in v1:
>>> >
>>> > This series adds Asymmetric Multiprocessing (AMP) boot support for the
>>> > Cortex-M7 core on the i.MX8MP SoC. The M7 firmware can be loaded and
>>> > started from Linux running on the Cortex-A53 cores via the remoteproc
>>> > framework.
>>> >
>>> > The series introduces the following peripheral models needed for AMP:
>>> >   - GPC (General Power Controller)
>>> >   - GPR (General Purpose Registers)
>>> >   - SRC (System Reset Controller) authored by Bernhard Beschow
>>> > <[email protected]>
>>> >   - MU (Messaging Unit)
>>> >   - Extends the CCM with M7 clock outputs and wires into the i.MX8MP SoC
>>> >   - Enable Cortex-M7 boot in i.MX8MP EVK functional test
>>> >
>>> > Changes in v2:
>>> >
>>> > - Removed the usage of device_class_set_legacy_reset in imx8mp
>>> > gpc,gpr,mu and
>>> >   src.
>>> > - Removed the usage of 'smp' , 'maxcpus' and 'enable-cm7' to make the
>>> >   invocation simpler.
>>> > - Cleaned up imx8mp_src by removing redundant/unused code.
>>> > - Updated Maintainers and improved the imx8mp documentation
>>> >
>>> > Signed-off-by: Gaurav Sharma <[email protected]>
>>> >
>>> > Bernhard Beschow (1):
>>> >   hw/misc: Add SRC (System Reset Controller) to i.MX8MP
>>> >
>>> > Gaurav Sharma (6):
>>> >   hw/misc: Add i.MX8MP GPC (General Power Controller) IP
>>> >   hw/misc: Add GPR (General Purpose Register) IP to iMX8MP
>>> >   hw/misc: Add MU (Messaging Unit) IP to i.MX8MP device model
>>> >   hw/misc: Extend i.MX8MP CCM with Cortex-M7 clock outputs
>>> >   hw/arm: Enable Cortex-M7 AMP boot on i.MX8MP
>>> >   tests/functional: Enable Cortex-M7 boot in i.MX8MP EVK functional
>>> > test
>>> >
>>> >  MAINTAINERS                                 |  13 +-
>>> >  docs/system/arm/imx8m.rst                   | 188 ++++++++++-
>>> >  hw/arm/Kconfig                              |   4 +
>>> >  hw/arm/fsl-imx8mp.c                         | 220 ++++++++++++-
>>> >  hw/arm/imx8mp-evk.c                         |   3 +-
>>> >  hw/misc/Kconfig                             |  12 +
>>> >  hw/misc/imx8mp_ccm.c                        |   9 +
>>> >  hw/misc/imx8mp_gpc.c                        | 146 +++++++++
>>> >  hw/misc/imx8mp_gpr.c                        | 153 +++++++++
>>> >  hw/misc/imx8mp_mu.c                         | 328 ++++++++++++++++++++
>>> >  hw/misc/imx8mp_src.c                        | 275 ++++++++++++++++
>>> >  hw/misc/meson.build                         |   4 +
>>> >  hw/misc/trace-events                        |   5 +
>>> >  include/hw/arm/fsl-imx8mp.h                 |  29 +-
>>> >  include/hw/misc/imx8mp_ccm.h                |   3 +
>>> >  include/hw/misc/imx8mp_gpc.h                |  34 ++
>>> >  include/hw/misc/imx8mp_gpr.h                |  56 ++++
>>> >  include/hw/misc/imx8mp_mu.h                 |  53 ++++
>>> >  include/hw/misc/imx8mp_src.h                |  31 ++
>>> >  tests/functional/aarch64/test_imx8mp_evk.py |   1 -
>>> >  20 files changed, 1539 insertions(+), 28 deletions(-)  create mode
>>> > 100644 hw/misc/imx8mp_gpc.c  create mode 100644
>>> hw/misc/imx8mp_gpr.c
>>> > create mode 100644 hw/misc/imx8mp_mu.c  create mode 100644
>>> > hw/misc/imx8mp_src.c  create mode 100644
>>> include/hw/misc/imx8mp_gpc.h
>>> > create mode 100644 include/hw/misc/imx8mp_gpr.h  create mode 100644
>>> > include/hw/misc/imx8mp_mu.h  create mode 100644
>>> > include/hw/misc/imx8mp_src.h
>>> >
>>> > --
>>> > 2.34.1
>>
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