fix: Switch to space-separated sources.conf format

- Change from colon to space separation to avoid URL parsing issues
- Update sources.conf format: TYPE NAME URL VERSION BUILD_FUNCTION [EXTRA]
- Implement awk-based parsing for reliable field extraction
- Fix firmware package list (remove unavailable linux-firmware-marvell)

initramfs/usr/share/dhcpcd/hooks/50-yp.conf

@@ -0,0 +1,59 @@
+# Sample dhcpcd hook for ypbind
+# This script is only suitable for the Linux version.
+
+ypbind_pid()
+{
+	[ -s /var/run/ypbind.pid ] && cat /var/run/ypbind.pid
+}
+
+make_yp_conf()
+{
+	[ -z "${new_nis_domain}${new_nis_servers}" ] && return 0
+	cf=/etc/yp.conf."$ifname"
+	rm -f "$cf"
+	echo "$signature" > "$cf"
+	prefix=
+	if [ -n "$new_nis_domain" ]; then
+		if ! valid_domainname "$new_nis_domain"; then
+			syslog err "Invalid NIS domain name: $new_nis_domain"
+			rm -f "$cf"
+			return 1
+		fi
+		domainname "$new_nis_domain"
+		if [ -n "$new_nis_servers" ]; then
+			prefix="domain $new_nis_domain server "
+		else
+			echo "domain $new_nis_domain broadcast" >> "$cf"
+		fi
+	else
+		prefix="ypserver "
+	fi
+	for x in $new_nis_servers; do
+		echo "$prefix$x" >> "$cf"
+	done
+	save_conf /etc/yp.conf
+	cat "$cf" > /etc/yp.conf
+	rm -f "$cf"
+	pid="$(ypbind_pid)"
+	if [ -n "$pid" ]; then
+		kill -HUP "$pid"
+	fi
+}
+
+restore_yp_conf()
+{
+	[ -n "$old_nis_domain" ] && domainname ""
+	restore_conf /etc/yp.conf || return 0
+	pid="$(ypbind_pid)"
+	if [ -n "$pid" ]; then
+		kill -HUP "$pid"
+	fi
+}
+
+if $if_configured; then
+	if $if_up; then
+		make_yp_conf
+	elif $if_down; then
+		restore_yp_conf
+	fi
+fi