From 46b67d2b72ac87b4c81cf02807f99a985d77f110 Mon Sep 17 00:00:00 2001
From: Dmitry Ermakov <7954832+dimerr@users.noreply.github.com>
Date: Sun, 8 Nov 2026 19:01:13 +0000
Subject: [PATCH] S40network: do not run udhcpc on an eth0 that cannot be
 opened

A board without a PHY still gets an eth0 from a MAC driver such as the
V83x sunxi-gmac, but opening it fails. busybox udhcpc then gets a read
error from every poll, logs "read error: Network is down, reopening
socket" and starts over. It only backgrounds on a poll timeout, so -b
never takes effect, S40network never returns and getty never starts.

Try to open eth0 first and skip ifup when that fails. Close it again
before ifup, which sets hwaddress.
---
 general/overlay/etc/init.d/S40network | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/general/overlay/etc/init.d/S40network b/general/overlay/etc/init.d/S40network
index d4eb925575..04679ad197 100755
--- a/general/overlay/etc/init.d/S40network
+++ b/general/overlay/etc/init.d/S40network
@@ -287,7 +287,7 @@ start() {
 	if [ -n "$dev" ]; then
 		set_wireless
 	else
-		ifup eth0
+		ip link set eth0 up 2>/dev/null && ip link set eth0 down && ifup eth0
 	fi
 }