"My point is that there is no difference between software and hardware."
Okay, now I see where you're coming from. Theoretically I agree. However, practically there are a number of things that make hardware different:
* Hardware has inherent "buy-in". The software systems you describe as also solving the memory access problem are basically opt-in frameworks. While you can make software frameworks hard to opt-out of (e.g. OS integration etc.) by definition... software runs on hardware...
* hardware solutions are often much more transparent. Again, your software example require a great deal of re-tooling. One of the most elegant aspects of the classic 80's memory access solution was how transparent it was.
* The ratio of software to hardware vendors has far fewer hardware vendors. Combine this with the fact that, as you point out, hardware is so expensive to retool and you create an environment where it is much more likely that a single hardware solution will be "correct enough" to enforce a constraint on software than it is the case that the majority of software will properly opt-in to a framework/code-correctly.
Okay, now I see where you're coming from. Theoretically I agree. However, practically there are a number of things that make hardware different:
* Hardware has inherent "buy-in". The software systems you describe as also solving the memory access problem are basically opt-in frameworks. While you can make software frameworks hard to opt-out of (e.g. OS integration etc.) by definition... software runs on hardware...
* hardware solutions are often much more transparent. Again, your software example require a great deal of re-tooling. One of the most elegant aspects of the classic 80's memory access solution was how transparent it was.
* The ratio of software to hardware vendors has far fewer hardware vendors. Combine this with the fact that, as you point out, hardware is so expensive to retool and you create an environment where it is much more likely that a single hardware solution will be "correct enough" to enforce a constraint on software than it is the case that the majority of software will properly opt-in to a framework/code-correctly.