Re: [PATCH 0/4] Add i.MX94 remoteproc support and reset vector handling improvements

[Daniel Baluta]

On 3/12/26 14:36, Peng Fan (OSS) wrote:
> This series adds remoteproc support for the i.MX94 family, including the
> CM70, CM71, and CM33S cores, and introduces a new device‑tree property to
> correctly derive the hardware reset vector for Cortex‑M processors whose
> ELF entry point does not directly correspond to the actual reset address.
>
> Background:
> Cortex‑M processors fetch their initial SP and PC from a fixed reset vector
> table. While ELF images embed the entry point (e_entry), this value is
> not always aligned to the hardware reset address. On platforms such as
> i.MX94 CM33S, masking is required to compute the correct reset vector
> address before programming the SoC reset registers.

What happens if the reset vector is at 0 and the e_entry point is at 0x800...?

In this case masking will no longer work! Can we implement a generic approach?


>
> Similarly, on i.MX95, the existing implementation always programs a reset
> vector of 0x0, which only works when executing entirely from TCM. When
> firmware is loaded into DDR, the driver must pass the correct reset vector
> to the SM CPU/LMM interfaces.
>
> This series addresses these issues and provides the necessary DT bindings
> and driver support.
>
> Summary of patches:
> [1]dt-bindings: remoteproc: imx-rproc: Introduce fsl,reset-vector-mask
> Adds a new DT property allowing SoCs to specify a mask for deriving the
> hardware reset vector from the ELF entry point.
>
> [2]dt-bindings: remoteproc: imx-rproc: Support i.MX9[4,52]
> Adds compatible strings for i.MX94 CM70, CM71, and CM33S processors.
>
> [3]remoteproc: imx_rproc: Pass bootaddr to SM CPU/LMM reset vector
> Ensures the correct reset vector is passed to SM APIs by introducing a
> driver‑level helper (imx_rproc_get_boot_addr()) that applies the
> reset‑vector mask.
>
> [4]remoteproc: imx_rproc: Add support for i.MX94 remoteproc
> Adds address translation tables and configuration data for CM70, CM71,
> and CM33S, enabling full remoteproc operation on i.MX94.
>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
> Peng Fan (4):
>       dt-bindings: remoteproc: imx-rproc: Introduce fsl,reset-vector-mask
>       dt-bindings: remoteproc: imx-rproc: Support i.MX94
>       remoteproc: imx_rproc: Pass bootaddr to SM CPU/LMM reset vector
>       remoteproc: imx_rproc: Add support for i.MX94
>
>  .../bindings/remoteproc/fsl,imx-rproc.yaml         |  9 +++
>  drivers/remoteproc/imx_rproc.c                     | 85 +++++++++++++++++++++-
>  2 files changed, 91 insertions(+), 3 deletions(-)
> ---
> base-commit: 7109a2155340cc7b21f27e832ece6df03592f2e8
> change-id: 20260311-imx943-rproc-2050e00b65f7
>
> Best regards,