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

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?

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
>