Some do, some ARM-based devices have tightly coupled memory (TCM). The RP2040 in the original Raspberry Pi also has a 4K bank for each core intended for stack and per-core variables, though it is not limited to access only by that core.
The main disadvantage of such dedicated memory is inefficient usage compared to using that same amount of fast local memory to cache _all_ of main memory.
Comments
Some do, some ARM-based devices have tightly coupled memory (TCM). The RP2040 in the original Raspberry Pi also has a 4K bank for each core intended for stack and per-core variables, though it is not limited to access only by that core.
The main disadvantage of such dedicated memory is inefficient usage compared to using that same amount of fast local memory to cache _all_ of main memory.