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Currently I receive rustc crashes after memory usage get to 3GB (1GB RAM + 2GB SWAP) when building firefox. After looking around why, I found that kernel isn't build with lpae extension. Although H3 soc supports lpae (Large Physical Address Extension), but kernel has CONFIG_ARM_LPAE flag not set and so we can't use more than 3GB of memory (1GB is reserved for kernel). (Processors that implement the ARMv7-A Large Physical Address Extension (LPAE), expand the range of accessible physical addresses from 4GB (232 bytes) to 1024GB (240 bytes) a terabyte, by translating 32-bit virtual memory addresses into 40-bit physical memory addresses.) After looking around I found that there isn't any armbian release where this flag is enabled, but other distros have this correctly enabled by default, debian https://wiki.debian.org/DebianKernel/ARMMP openwrt I also wonder if used build options are generic or did they make use of CPU extensions. H3 also supports VFPv4 or VFPv4-D32 for H3 example: -march=armv7ve -mtune=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4 my output from cat /proc/cpuinfo orangepi-PC processor : 3 model name : ARMv7 Processor rev 5 (v7l) BogoMIPS : 65.14 Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x0 CPU part : 0xc07 CPU revision : 5