The Problem with Backwards Compatibility
One feature that has been a major aspect of mainstream processors such as the x86 range is backwards compatibility. For over 40 years, this feature has allowed software from past platforms to remain functional on newer hardware.
While this may have been a necessary feature in the early days of computing, it is something that needs to be dropped. Trying to make a CPU support older systems not only wastes precious silicon space, but also introduces inefficiencies into both the CPU and the operating system.
On top of that, bugs and security flaws need to be carefully patched, it restricts what new hardware can do, and it prevents us from fully utilising modern concepts. To make matters worse, Microsoft DOS can boot on a modern platform, and that, in my opinion, is just plain wrong!
Linux Dropping Support for Intel 486 After 37 Years
After 37 years, Linux is gradually phasing out support for the Intel 486 processor. According to Linus Torvalds (creator of Linux), there is no reason for the Linux community to continue supporting the Intel 486 processor. Linux developer Ingo Molnar has created a patch to remove support for the Intel 486, which is expected to be merged into Linux 7.1.
The resulting update, Linux 7.1, will prevent users from building Intel486 kernel images, and the support code for the Intel486 will be removed in subsequent versions of the kernel after the release of Linux 7.1. According to Molnar, supporting older 32-bit CPUs presents ongoing maintenance challenges due to the requirement of complex hardware emulations.
The removal of support for the Intel486 and the early Intel586 will result in the removal of over 10,000 lines of code, according to Molnar.
Finally, A Step In The Right Direction
There is nothing more frustrating than trying to support older systems. Not only is it a waste of resources, but it causes headaches for engineers and wastes engineering time, which could be better spent on improving newer systems. By removing older systems, we can move towards modern solutions for modern systems, but this doesn’t mean we can drop support in favour for slop.
But that doesn’t mean we can be careless; knowing modern engineers, we need to be careful with the new software we write, and not being reliant on AI to do it for us. This is a golden opportunity to create systems that are strong, better, and faster.
Cleaner architectures become possible without decades of legacy constraints holding back design decisions. We also get reduced attack surfaces as legacy code paths and outdated features are eliminated. Designs become easier to maintain and debug due to smaller, more focused codebases and fewer edge cases.
Better performance per watt also becomes a reality as hardware is no longer burdened with inefficient compatibility layers. And finally, we get to see more efficient use of silicon as unnecessary legacy logic can be removed from processor designs.
This situation presents an opportunity to rethink OS design from the ground up with modern requirements and hardware capabilities in mind.
