Funtoo ARM64 CPU WIKI

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https://www.funtoo.org/Funtoo_CPU_Database

Unfortunately This page has nil for Arm64 CPU's and documentation however THIS page below Will hopefully grow till added to above.

https://wiki.gentoo.org/wiki/Safe_CFLAGS#ARM still has older Settings , included for reference and or adding in.

RPI4/Rock64 Rock64pro and Pinebookpro laptop.

filename=/etc/portage/make.conf

COMMON_FLAGS="-O2 -pipe -march=armv8-a+crc+crypto -mcpu=cortex-a72.cortex-a53 ${GRAPHITE} ${CPU_FLAGS_ARM64}"

CPU_FLAGS_ARM64="edsp neon thumb vfp vfpv3 vfpv4 vfp-d32 crc32 v4 v5 v6 v7 v8 thumb2"

https://raw.githubusercontent.com/necrose99/arm64-portage/master/package.use/00cpu-flags (app-portage/cpuid2cpuflags output)

For Rpi4 soon Vulkan-vc? gpu for now Vc4 , Odroid-X4 ? Rock64/Pine64/Pinebook varriants also mali/bifrost panfrost kernel mode drivers , Panfrost being opensource. https://raw.githubusercontent.com/necrose99/arm64-portage/master/mesa template ...