I´ve created a minimal config for creating a ath79 image.
Should be easy to adopt this to a ar71xx image.
Notes for this config:
- no ppp/pppoe/...
- no opkg
- no dmesg
- no debugfs
- ...
You could use that as base and enable anything you need...
The resultant image size for wr841v7 with this config is 2.7 MB.
CONFIG_TARGET_ath79=y
CONFIG_TARGET_ath79_tiny=y
CONFIG_TARGET_MULTI_PROFILE=y
CONFIG_TARGET_DEVICE_ath79_tiny_DEVICE_tl-wr841-v7=y
# CONFIG_ATH9K_UBNTHSR is not set
# CONFIG_KERNEL_CRASHLOG is not set
# CONFIG_KERNEL_DEBUG_FS is not set
# CONFIG_KERNEL_DEBUG_INFO is not set
# CONFIG_KERNEL_DEBUG_KERNEL is not set
# CONFIG_KERNEL_ELF_CORE is not set
# CONFIG_KERNEL_IPV6_MROUTE is not set
# CONFIG_KERNEL_IP_MROUTE is not set
# CONFIG_KERNEL_MAGIC_SYSRQ is not set
# CONFIG_KERNEL_PRINTK is not set
# CONFIG_KERNEL_PRINTK_TIME is not set
# CONFIG_KERNEL_SWAP is not set
# CONFIG_PACKAGE_MAC80211_DEBUGFS is not set
# CONFIG_PACKAGE_MAC80211_MESH is not set
# CONFIG_PACKAGE_kmod-lib-crc-ccitt is not set
# CONFIG_PACKAGE_kmod-ppp is not set
# CONFIG_PACKAGE_libpthread is not set
# CONFIG_PACKAGE_libuclient is not set
# CONFIG_PACKAGE_odhcp6c is not set
# CONFIG_PACKAGE_odhcpd-ipv6only is not set
# CONFIG_PACKAGE_opkg is not set
# CONFIG_PACKAGE_ppp is not set
# CONFIG_PACKAGE_uclient-fetch is not set
CONFIG_STRIP_KERNEL_EXPORTS=y
CONFIG_TARGET_SQUASHFS_BLOCK_SIZE=1024
CONFIG_USE_MKLIBS=y
With this config as base i was able to add luci, openvpn-mbedtls and full wpad to a image for a 4mb device.