zephyr/soc: Add MediaTek DSPs #34
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This was referenced Nov 26, 2024
Add HAL integration for mt8186/88 and mt8196 DSP processors. Also rename the existing mt8195 HAL directory to match the newer naming scheme in the Zephyr SOC family. Signed-off-by: Andy Ross <[email protected]>
First, recent Cadence toolchains have begun using the UINT32_C() to define constants, but don't include stdint.h to import it. And in any case the stdint.h headers in our toolchains aren't assembly-compatible. Give it a reasonable definition inline. Also, replace the use of the "addi.a" pseudoinstruction in the (unused by Zephyr) register context macros with a simple "addi". I'm unable to figure this one out, this isn't a documented mnemonic, it's not supported by any version of binutils (or even xt-clang in its default mode). When I disassemble the upstream HALs, I can verify that the emitted instruction for the sequence is a regular addi (though in the Cadence binaries it's packed in a VLIW bundle, which doesn't match the assembly source here...). My guess is that this is a hint for bundle packing, but I don't know. Regardless, our headers dating back into SOF have always just used "addi" here, which builds fine and will run compatibly. And again, Zephyr doesn't use this HAL feature anyway. Signed-off-by: Andy Ross <[email protected]>
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Add HAL integration for mt8186/88 and mt8196 DSP processors.