[meta-ti][master/wrynose][PATCH v2 2/2] initramfs: Add initramfs-module-netsetup recipe for DHCP network configuration

Add a standalone initramfs-module-netsetup recipe that installs 83-netsetup,
an initramfs-framework module that configures the network interface via DHCP
before the NFS root mount. Needed when the Ethernet driver is a loadable
module and the deferred probe chain requires time to settle after udev loads
the modules. Add initramfs-module-netsetup to packagegroup-ti-core-initramfs
to pull it into the initramfs image.

Signed-off-by: Moteen Shah <[email protected]>
---
 .../initramfs-module-netsetup/83-netsetup     | 54 +++++++++++++++++++
 .../initramfs-module-netsetup_1.0.bb          | 24 +++++++++
 .../packagegroup-ti-core-initramfs.bb         |  1 +
 3 files changed, 79 insertions(+)
 create mode 100644 meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup/83-netsetup
 create mode 100644 meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb

diff --git a/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup/83-netsetup b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup/83-netsetup
new file mode 100644
index 00000000..b71bc3b3
--- /dev/null
+++ b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup/83-netsetup
@@ -0,0 +1,54 @@
+#!/bin/sh
+# Configure network via DHCP before NFS root mount. Polls for an Ethernet
+# interface with sleep 1 per iteration to allow the Ethernet driver deferred
+# probe chain to settle after udev loads the modules.
+
+netsetup_enabled() {
+    [ "${bootparam_root}" = "/dev/nfs" ] || return 1
+    return 0
+}
+
+netsetup_run() {
+    local iface timeout devtype
+
+    # Extract interface from ip= kernel param (format: client:server:gw:mask:host:device:autoconf)
+    iface=""
+    case "${bootparam_ip}" in
+        dhcp|on|any|"")
+            ;;
+        *)
+            iface=$(echo "${bootparam_ip}" | cut -d: -f6)
+            ;;
+    esac
+
+    udevadm trigger --action=add --subsystem-match=net
+    udevadm settle --timeout=10
+
+    # Poll up to 60 seconds for an Ethernet interface (ARPHRD_ETHER = type 1).
+    msg "netsetup: waiting for ethernet interface..."
+    timeout=60
+    while [ "${timeout}" -gt 0 ]; do
+        if [ -n "${iface}" ] && [ -d "/sys/class/net/${iface}" ]; then
+            break
+        fi
+        for dev in /sys/class/net/*; do
+            [ -f "${dev}/type" ] || continue
+            devtype=$(cat "${dev}/type")
+            [ "${devtype}" = "1" ] || continue
+            iface=$(basename "${dev}")
+            break
+        done
+        [ -n "${iface}" ] && [ -d "/sys/class/net/${iface}" ] && break
+        sleep 1
+        timeout=$((timeout - 1))
+    done
+
+    if [ -z "${iface}" ] || [ ! -d "/sys/class/net/${iface}" ]; then
+        msg "netsetup: no ethernet interface found after 60s, skipping DHCP"
+        return
+    fi
+
+    msg "netsetup: configuring ${iface} via DHCP"
+
+    dhcpcd --waitip "${iface}"
+}
diff --git a/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb
new file mode 100644
index 00000000..a4565a25
--- /dev/null
+++ b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb
@@ -0,0 +1,24 @@
+SUMMARY = "initramfs support for DHCP network configuration before NFS root mount"
+
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
+
+SRC_URI = "file://83-netsetup"
+
+S = "${UNPACKDIR}"
+
+do_install() {
+    install -d ${D}/init.d
+    install -m 0755 ${UNPACKDIR}/83-netsetup ${D}/init.d/83-netsetup
+}
+
+FILES:${PN} = "/init.d/83-netsetup"
+
+RDEPENDS:${PN} = "\
+    initramfs-framework-base \
+    dhcpcd \
+"
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"
diff --git a/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb b/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
index a9eff847..2e68366d 100644
--- a/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
+++ b/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
@@ -19,6 +19,7 @@ RDEPENDS:${PN} += "\
     base-files \
     base-passwd \
     initramfs-framework-base \
+    initramfs-module-netsetup \
     initramfs-module-udev \
     initramfs-module-nfsrootfs \
     nfs-utils-mount \
-- 
2.34.1