RPC/OpenAMP: Support loading sketches to SDRAM. #934
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Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
facchinm
requested changes
Aug 1, 2024
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 <i.abdalkader@gmail.com>
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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 <i.abdalkader@gmail.com>
…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 <i.abdalkader@gmail.com>
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Signed-off-by: Martino Facchin <m.facchin@arduino.cc>
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To use this with MicroPython, to load Arduino sketches to SDRAM, it requires micropython/micropython#15499
Which has been merged, so a nightly build will work.