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RPC/OpenAMP: Support loading sketches to SDRAM. #934

Merged
merged 5 commits into from
Sep 9, 2024
Merged

RPC/OpenAMP: Support loading sketches to SDRAM. #934

merged 5 commits into from
Sep 9, 2024

Commits on Aug 1, 2024

  1. RPC: Add license file and headers. 

    Signed-off-by: iabdalkader <[email protected]>
    @iabdalkader
    iabdalkader committed Aug 1, 2024
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  2. RPC: Configure M4 memory as strongly ordered if booting from SDRAM. 

    If the Cortex-M4 core is booting from SDRAM, the memory region must be
configured as Strongly Ordered. Note that the Cortex-M4 core does not
seem to implement speculative prefetching, so there is no need to protect
the whole region from speculative prefetching with a second MPU region.

Signed-off-by: iabdalkader <[email protected]>
    @iabdalkader
    iabdalkader committed Aug 1, 2024
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  3. openamp: Load the resource table manually in resource_table_init. 

    This patch allows removing the Open-AMP section used for the resource table
by loading it manually. The Open-AMP ELF loader would attempt to load this
section if the firmware is built for SDRAM.
Note that since we're not using copy tables or ARM CC, the resource table
has always been copied manually.

Signed-off-by: iabdalkader <[email protected]>
    @iabdalkader
    iabdalkader committed Aug 1, 2024
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  4. variants/GENERIC_STM32H747_M4: Update linker_script to support DRAM f… 

    …irmware.

To load the M4 firmware into SDRAM, we must ensure the linker script does not
include any loadable sections that are placed in the shared memory region. If
such sections exist, the ELF loader will overwrite the shared memory region
when loading the firmware.

Additionally, the Open-AMP section is no longer required, as the resource table
is now populated manually in resource_table_init. Therefore, this section can
be removed.

Signed-off-by: iabdalkader <[email protected]>
    @iabdalkader
    iabdalkader committed Aug 1, 2024
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  5. Add linker script patch. 

    Signed-off-by: Martino Facchin <[email protected]>
    @iabdalkader
    iabdalkader committed Aug 1, 2024
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