Linked by Thom Holwerda on Sat 12th Jan 2013 22:53 UTC
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Member since:
2007-04-18
ARM doesn't have a machine architecture standard such as x86 has (IBM PC), so no wonder there is little to no homebrew when compared to x86. At a fundamental level, from a software perspective, every PC looks the same. There's a BIOS mapped at a certain address which has certain standard functions you can invoke, every PC has a standard ISA and (later) PCI bus interface that is largely probed in the same way, etc. ARM lacks that. Even a single ARM CPU model can be implemented and firmware-coded to wildly different behavior (which is why bootloaders and firmware blobs are often times highly vendor-specific).
IBM's (and their clone maker's) contribution is easily taken for granted, but it was by no means a small thing in the industry.