For example, look at all of the legacy stuff in an x86 system. You have the strange structure of the interrupt descriptor table/global descriptor table. You have the good old Intel 8042 keyboard controller, Intel 8259 programmable interrupt controller, old-style programmable interval timer, A20 gate and so much more.
There's so much legacy baggage inherent in the x86 architecture, all because of software compatibility. (ROM-BASIC will still run on a modern PC!)
ARM on the other hand has less to really worry about, sure there's some legacy infrastructure, such as the ARM vector table. Modern ARM architectures such as ARMv8-A remove old legacy baggage in favor of completely renovating it. (Look at the old coprocessor interface for instance. In A64 mode, it is completely gone. You must use 'mrs/msr' instructions compared to 'mrc/mcr'). There's also far less legacy software to worry about.
Comments
For example, look at all of the legacy stuff in an x86 system. You have the strange structure of the interrupt descriptor table/global descriptor table. You have the good old Intel 8042 keyboard controller, Intel 8259 programmable interrupt controller, old-style programmable interval timer, A20 gate and so much more.
There's so much legacy baggage inherent in the x86 architecture, all because of software compatibility. (ROM-BASIC will still run on a modern PC!)
ARM on the other hand has less to really worry about, sure there's some legacy infrastructure, such as the ARM vector table. Modern ARM architectures such as ARMv8-A remove old legacy baggage in favor of completely renovating it. (Look at the old coprocessor interface for instance. In A64 mode, it is completely gone. You must use 'mrs/msr' instructions compared to 'mrc/mcr'). There's also far less legacy software to worry about.