https://www.merriam-webster.com/dictionary/subarch
SUBARCH Definition & Meaning - Merriam-Webster
The meaning of SUBARCH is a subordinate arch especially when one of two or more grouped in a larger arch.
definitionmeaningmerriamwebster
https://android.googlesource.com/kernel/common/+/refs/heads/android-mainline/scripts/subarch.include
scripts/subarch.include - kernel/common - Git at Google
scriptsincludekernelcommongit
https://lwn.net/Articles/353856/
Runtime PM: ARM: subarch-specific extensions of pdev_archdata [LWN.net]
runtimepmarmspecific