75 lines
2.8 KiB
Bash
75 lines
2.8 KiB
Bash
#!/usr/bin/env bash
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#
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# Armbian Optimizations for Low-Memory Boards
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#
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# Boards with less than *256MB* RAM need special optimizations to run Armbian smoothly.
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# This extension applies the necessary *userland* (not-kernel) optimizations
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# at build time.
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#
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function post_family_tweaks_bsp__initramfs() {
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local LOWMEM_TMPFS_RUN_MB=${LOWMEM_TMPFS_RUN_MB:-20}
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display_alert "${EXTENSION}" "Set initramfs config for low memory" "debug"
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# Create /etc/initramfs-tools/conf.d/armbian-lowmem.conf configuration file
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if [ ! -f "$destination/etc/initramfs-tools/conf.d/armbian-lowmem.conf" ]; then
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mkdir -p "$destination/etc/initramfs-tools/conf.d"
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install -m 644 /dev/null "$destination/etc/initramfs-tools/conf.d/armbian-lowmem.conf"
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# Load only modules needed for boot
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echo "MODULES=dep" >> "$destination/etc/initramfs-tools/conf.d/armbian-lowmem.conf"
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# /run is 10% of RAM by default
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# systemd throws errors when <16MB is *free* in this partition
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# during daemon-reload operations.
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# Address with a fixed /run size of ${LOWMEM_TMPFS_RUN_MB}
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echo "RUNSIZE=${LOWMEM_TMPFS_RUN_MB}M" >> "$destination/etc/initramfs-tools/conf.d/armbian-lowmem.conf"
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fi
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return 0
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}
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function post_family_tweaks_bsp__copy_lowmem_config() {
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display_alert "${EXTENSION}" "Installing default configuration" "debug"
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# Copy /etc/default/armbian-lowmem configuration file
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# Allows user to customize swapfile size / location
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if [ ! -f "$destination/etc/default/armbian-lowmem" ]; then
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install -m 664 "$SRC/packages/bsp/armbian-lowmem/etc/default/armbian-lowmem.dpkg-dist" "$destination/etc/default/armbian-lowmem"
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fi
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return 0
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}
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function post_family_tweaks_bsp__copy_lowmem_mkswap() {
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local service_name="lowmem-mkswap"
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# Devices with very low memory need a swapfile to operate smoothly (apt, locale-gen, etc)
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display_alert "${EXTENSION}" "Installing ${service_name}.service" "debug"
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# Copy systemd service and script to create swapfile
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install -m 755 "$SRC/packages/bsp/armbian-lowmem/${service_name}.sh" "$destination/usr/bin/${service_name}.sh"
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install -m 644 "$SRC/packages/bsp/armbian-lowmem/${service_name}.service" "$destination/lib/systemd/system/${service_name}.service"
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return 0
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}
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function post_family_tweaks__enable_lowmem_mkswap() {
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local service_name="lowmem-mkswap"
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display_alert "${EXTENSION}" "Enabling ${service_name}.service" "debug"
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chroot_sdcard systemctl enable "${service_name}.service"
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return 0
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}
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function pre_umount_final_image__memory_optimize_defaults() {
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# Optimize /etc/default settings to reduce memory usage
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display_alert "${EXTENSION}" "Disabling ramlog by default to save memory" "debug"
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sed -i "s/^ENABLED=.*/ENABLED=false/" "${MOUNT}"/etc/default/armbian-ramlog
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display_alert "${EXTENSION}" "Disabling zram swap by default" "debug"
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sed -i "s/^#\?\s*SWAP=.*/SWAP=false/" "${MOUNT}"/etc/default/armbian-zram-config
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return 0
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}
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