Added kernel-extra.config for customization

initramfs/init

@@ -1,20 +1,19 @@
 #!/bin/sh
 
-mount -t proc none /proc
-mount -t sysfs none /sys
+mount -t devtmpfs devtmpfs /dev
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
 
-cat <<!
+# Optional but nice
+mkdir -p /dev/pts
+mount -t devpts devpts /dev/pts
 
-  _    _ _     __  __                   _ 
- | |  | (_)   |  \/  |                 | |
- | |__| |_    | \  / | ___  _ __   ___ | |
- |  __  | |   | |\/| |/ _ \| '_ \ / _ \| |
- | |  | | |_  | |  | | (_) | | | | (_) |_|
- |_|  |_|_( ) |_|  |_|\___/|_| |_|\___/(_)
-          |/                              
+echo "Booting kernel took $(cut -d' ' -f1 /proc/uptime) seconds."
+echo "Dropping to shell on ttyS0..."
 
-Booting kernel took $(cut -d' ' -f1 /proc/uptime) seconds.
+while true; do
+    setsid cttyhack /bin/sh
+    echo "Shell exited. Starting another one..."
+done
 
-!
-exec /bin/sh
-EOF
+exec poweroff -f

initramfs/selective-mods.sh

@@ -0,0 +1,107 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Stage a subset of kernel modules into a target rootfs/initramfs tree.
+#
+# Example:
+#   ./stage-initramfs-modules.sh \
+#       /out/rootfs/lib/modules/6.18.2 \
+#       /out/initramfs
+#
+# Result:
+#   /out/initramfs/lib/modules/6.18.2/...
+#
+# Notes:
+# - This copies selected directories and modules.* metadata.
+# - It does NOT run depmod for you unless you uncomment that section.
+# - Best run after kernel modules have already been installed into the source tree.
+
+if [[ $# -ne 2 ]]; then
+    echo "Usage: $0 <source-lib-modules-version-dir> <dest-root>"
+    echo "Example: $0 /out/rootfs/lib/modules/6.18.2 /out/initramfs"
+    exit 1
+fi
+
+SRC_MODDIR="$1"   # e.g. /out/rootfs/lib/modules/6.18.2
+DEST_ROOT="$2"    # e.g. /out/initramfs
+
+if [[ ! -d "$SRC_MODDIR" ]]; then
+    echo "Source module dir does not exist: $SRC_MODDIR" >&2
+    exit 1
+fi
+
+KVER="$(basename "$SRC_MODDIR")"
+DEST_MODDIR="$DEST_ROOT/lib/modules/$KVER"
+
+mkdir -p "$DEST_MODDIR"
+
+echo "==> Source: $SRC_MODDIR"
+echo "==> Dest:   $DEST_MODDIR"
+echo
+
+# Relative paths under /lib/modules/<version>
+PATHS=(
+    # Metadata files used by modprobe/depmod.
+    "modules.builtin"
+    "modules.builtin.modinfo"
+    "modules.order"
+
+    "modules.dep"
+    "modules.dep.bin"
+    "modules.alias"
+    "modules.alias.bin"
+    "modules.symbols"
+    "modules.symbols.bin"
+    "modules.softdep"
+
+    # Core module dirs we may need.
+    "kernel/drivers/pwm"
+    "kernel/drivers/hwmon"
+    "kernel/drivers/thermal"
+
+    # Optional
+    # "kernel/drivers/i2c"
+    # "kernel/drivers/gpio"
+    # "kernel/drivers/base"
+    # "kernel/drivers/power"
+    # "kernel/drivers/platform"
+)
+
+copy_one() {
+    local rel="$1"
+    local src="$SRC_MODDIR/$rel"
+    local dst="$DEST_MODDIR/$rel"
+
+    if [[ -d "$src" ]]; then
+        echo "[DIR ] $rel"
+        mkdir -p "$(dirname "$dst")"
+        cp -a "$src" "$dst"
+    elif [[ -f "$src" ]]; then
+        echo "[FILE] $rel"
+        mkdir -p "$(dirname "$dst")"
+        cp -a "$src" "$dst"
+    else
+        echo "[MISS] $rel"
+    fi
+}
+
+for rel in "${PATHS[@]}"; do
+    copy_one "$rel"
+done
+
+echo
+echo "==> Done staging selected modules."
+
+# Optional: show what got copied
+echo
+echo "==> Staged files summary:"
+find "$DEST_MODDIR" -type f | sed "s#^$DEST_ROOT/##" | sort
+
+# Optional: if depmod exists INSIDE the build environment and you want to
+# regenerate metadata for the destination tree, uncomment this block.
+#
+# if command -v depmod >/dev/null 2>&1; then
+#     echo
+#     echo "==> Running depmod for destination tree..."
+#     depmod -b "$DEST_ROOT" "$KVER"
+# fi