hi3518ev300_lite: drop dead kernel modules + build TUN in#2164
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Follow-up to #2163. After the vfat/fat builtin shift the variant had 24 KB of rootfs headroom against 155 KB of uImage headroom — lopsided. This rebalances by removing four kernel module families that have no plausible code path on an ARM IP camera, and folding TUN into the kernel so OpenVPN setups work without a separate .ko. Dropped (=n): - SCSI_FC_ATTRS (55 KB) — Fibre Channel HBA transport. No FC hardware on ARM camera. scsi_mod.ko also shrinks ~1.6 KB by losing the hooks. - USB_LIBCOMPOSITE + USB_CONFIGFS + CONFIGFS_FS (82 KB) — USB gadget mode. Camera is the USB host, never the device; no init script wires up gadget functions or mounts configfs. - I2C_TINY_USB (6 KB) — niche hobbyist USB→I2C bridge. - BRIDGE_NETFILTER (17 KB) — bridge firewalling. No br0 setup, no bridge interface brought up by any init script. Built-in (=y): - TUN (27 KB) — needed by OpenVPN. WireGuard creates wg* interfaces directly so doesn't need it, but the marginal kernel cost (~6 KB compressed) buys zero-config OpenVPN. Local build hi3518ev300_lite: - uImage: 1893 → 1898 KB / 2048 KB (150 KB headroom) - rootfs.squashfs: 5096 → 5036 KB / 5120 KB ( 84 KB headroom, was 24 KB) - total .ko bytes: 4860 → 4671 KB Confirmed absent from output/target/lib/modules/: tun.ko, scsi_transport_fc.ko, i2c-tiny-usb.ko, libcomposite.ko, configfs.ko, br_netfilter.ko. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Follow-up to #2163. After the vfat/fat builtin shift, the variant had 24 KB rootfs headroom against 155 KB uImage headroom — lopsided. This rebalances by removing four kernel module families with no plausible code path on an ARM IP camera, and folding
TUNinto the kernel so OpenVPN works without a separate.ko.Changes (
hi3518ev300.generic.config)Dropped (=n):
SCSI_FC_ATTRSscsi_transport_fc.ko)scsi_mod.koalso shrinks ~1.6 KB by losing the hooks.USB_LIBCOMPOSITE+USB_CONFIGFS+CONFIGFS_FSlibcomposite.ko+configfs.ko)configfs.I2C_TINY_USBBRIDGE_NETFILTERbr_netfilter.ko)br0setup, no bridge interface brought up by any init script.Built-in (=y):
TUNtun.ko)wg*interfaces directly so doesn't need it, but the marginal kernel cost (~6 KB compressed) gives zero-config OpenVPN.Local build results
hi3518ev300_lite:Confirmed absent from
output/target/lib/modules/:tun.ko,scsi_transport_fc.ko,i2c-tiny-usb.ko,libcomposite.ko,configfs.ko,br_netfilter.ko.Cross-variant note
Same
hi3518ev300.generic.configis shared withhi3518ev300_ultimate. Ultimate's last passing CI: uImage 1873/2048 (175 KB headroom), rootfs.squashfs 7664/8192 (528 KB headroom). The +25 KB combined uImage delta from this PR + #2163 fits well under cap, and ultimate gets ~60 KB rootfs headroom recovery too. CI will validate.Test plan
hi3518ev300_litehi3518ev300_ultimatehi3518ev300_litecamera with OpenVPN config works without manualmodprobe tun🤖 Generated with Claude Code