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IRQ[n] In ELF images, the corresponding layout is: reset_vectors: --> hardware reset address .word __stack_end__ .word Reset_Handler .word NMI_Handler .word HardFault_Handler ... .word UART_IRQHandler .word SPI_IRQHandler ... Reset_Handler: --> ELF entry point address ... The hardware fetches the first two words from reset_vectors and populates SP with __stack_end__ and PC with Reset_Handler. Execution proceeds from Reset_Handler. However, the ELF entry point does not always match the hardware reset address. For example, on i.MX94 CM33S: ELF entry point: 0x0ffc211d CM33S hardware reset base: 0x0ffc0000 To derive the correct hardware reset address, the unused lower bits must be masked off. The boot code should apply a SoC=E2=80=91specific mask before programming the reset address registers, e.g.: reset_address =3D entry & reset-vector-mask This reset address derivation method is also applicable to i.MX8M Cortex-M7/4 cores. Introduces the optional DT property `fsl,reset-vector-mask` to specify the mask used for deriving the hardware reset address from the ELF entry point. Signed-off-by: Peng Fan --- Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yam= l b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml index ce8ec0119469c8fc0979a192b6e3d3a03108d7d2..683f0c36293c08616621daa79c0= b8914b0f48bba 100644 --- a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml +++ b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml @@ -85,6 +85,12 @@ properties: This property is to specify the resource id of the remote processor = in SoC which supports SCFW =20 + fsl,reset-vector-mask: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + This property is to specify the reset vector mask which is used + to mask off unused bits from ELF entry address. + required: - compatible =20 --=20 2.37.1