Limit amount of code copierd by vpr launcher #2660
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…nel ram region There are cases when code is relocated and we want to copy code and part of data (e.g. data section) but avoid copying noinit section. To achieve that noinit section is placed at the end of kernel_ram region. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
…code In order to allow extract relocation code size from the binary add dummy instruction at the beginning which will write address of the end of the relocation part to the register. It is decoded by the host core which copies riscv code. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
Instead of copying whole partition dedicated for VPR decode end address from the beginning of the binary code. Only code and certain portion of data is copied (excluding noinit section). It reduces the boot time and fixes issue where noinit section is overwritten after reset. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
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I've prepared a hacky solution that adds address of the end of relocation region to the beginning of the vpr binary. Vpr launcher decodes this address and copies only that part to RAM. This approach speeds up boot time and does not overwrite noinit section but it's hacky.
I'm not expecting that it will be merged. Its purpose is rather to trigger the discussion.