feat(buildroot): Update buildroot to 2025.08.1; Fix nix.

.gitignore

@@ -17,6 +17,6 @@
 !/hardware
 !/software
 !/scripts
-/software/OS_build
+#/software/OS_build
 !/submodules
 /submodules/*/*

Makefile

@@ -49,11 +49,13 @@ build-dts: $(OS_BUILD_DIR)
 	rm $(OS_BUILD_DIR)/$(SYSTEM_NAME)_tmp.dts
 
 ## Buildroot Makefile Variables and Targets
-BUILDROOT_VERSION=buildroot-2022.02.10
+BUILDROOT_VERSION=buildroot-2025.08.1
 BUILDROOT_DIR=$(OS_SUBMODULES_DIR)/$(BUILDROOT_VERSION)
 
 build-buildroot: $(OS_BUILD_DIR) $(BUILDROOT_DIR)
 	$(MAKE) -C $(BUILDROOT_DIR) BR2_EXTERNAL=$(OS_SOFTWARE_DIR)/buildroot iob_soc_defconfig
+	# PATCH: Apply patch for buildroot-2025.08.1 micropython: https://github.com/buildroot/buildroot/commit/ab906018c98e5f0838b023fa886c6c52a1cc5cf6
+	-cd $(BUILDROOT_DIR) && curl -L https://github.com/buildroot/buildroot/commit/ab906018c98e5f0838b023fa886c6c52a1cc5cf6.patch | patch -p1 -N
 	$(MAKE) -C $(BUILDROOT_DIR) -j`nproc`
 	cp $(BUILDROOT_DIR)/output/images/rootfs.cpio.gz $(OS_BUILD_DIR)
 

scripts/shell.nix

@@ -1,11 +1,4 @@
-{ pkgs ? import (builtins.fetchTarball {
-  # Descriptive name to make the store path easier to identify
-  name = "nixos-22.11";
-  # Commit hash for nixos-22.11
-  url = "https://github.com/NixOS/nixpkgs/archive/refs/tags/22.11.tar.gz";
-  # Hash obtained using `nix-prefetch-url --unpack <url>`
-  sha256 = "11w3wn2yjhaa5pv20gbfbirvjq6i3m7pqrq2msf0g7cv44vijwgw";
-}) {}}:
+{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/25.05.tar.gz") {}}:
 pkgs.mkShell {
   name = "iob-shell";
   buildInputs = with pkgs; [     
@@ -15,5 +8,14 @@ pkgs.mkShell {
     (callPackage ./scripts/riscv-gnu-toolchain.nix { })
     # Linux kernel build packages
     libyaml
+    ncurses
   ];
+  shellHook = ''
+    # fixes libstdc++.so.6 issues of buildroot's patchelf
+    export LD_LIBRARY_PATH=${pkgs.stdenv.cc.cc.lib}/lib
+  '';
+
+  # Disable hardening flags for gcc. Prevents errors when running buildroot, like these:
+  # https://github.com/riscv-collab/riscv-gnu-toolchain/issues/901
+  hardeningDisable = [ "all" ];
 }

software/buildroot/board/IObundle/iob-soc/rootfs-overlay/etc/init.d/S10mdev

@@ -0,0 +1,47 @@
+#!/bin/sh
+
+# SPDX-FileCopyrightText: 2025 IObundle
+#
+# SPDX-License-Identifier: MIT
+
+#
+# Run the mdev daemon
+#
+
+DAEMON="mdev"
+PIDFILE="/var/run/$DAEMON.pid"
+
+
+start() {
+	echo -n "Starting $DAEMON... "
+	start-stop-daemon -S -b -m -p $PIDFILE -x /sbin/mdev -- -df
+	[ $? -eq 0 ] && echo "OK" || echo "ERROR"
+
+	# coldplug modules
+	find /sys/ -name modalias -print0 | \
+		xargs -0 sort -u | \
+		tr '\n' '\0' | \
+		xargs -0 modprobe -abq
+}
+
+stop() {
+	echo -n "Stopping $DAEMON... "
+	start-stop-daemon -K -p $PIDFILE
+	[ $? -eq 0 ] && echo "OK" || echo "ERROR"
+}
+
+restart() {
+	stop
+	start
+}
+
+case "$1" in
+  start|stop|restart)
+	"$1"
+	;;
+  *)
+	echo "Usage: $0 {start|stop|restart}"
+	exit 1
+esac
+
+exit $?

software/buildroot/board/IObundle/iob-soc/rootfs-overlay/etc/mdev.conf

@@ -0,0 +1,43 @@
+# SPDX-FileCopyrightText: 2025 IObundle
+#
+# SPDX-License-Identifier: MIT
+
+# null may already exist; therefore ownership has to be changed with command
+null		root:root 666 @chmod 666 $MDEV
+zero		root:root 666
+full		root:root 666
+random		root:root 444
+urandom		root:root 444
+hwrandom	root:root 444
+grsec		root:root 660
+
+kmem		root:root 640
+mem		root:root 640
+port		root:root 640
+# console may already exist; therefore ownership has to be changed with command
+console		root:tty 600 @chmod 600 $MDEV
+ptmx		root:tty 666
+pty.*		root:tty 660
+
+# Typical devices
+tty		root:tty 666
+tty[0-9]*	root:tty 660
+vcsa*[0-9]*	root:tty 660
+ttyS[0-9]*	root:root 660
+ttyUSB[0-9]*	root:root 660
+
+# alsa sound devices
+snd/pcm.*	root:audio 660
+snd/control.*	root:audio 660
+snd/midi.*	root:audio 660
+snd/seq		root:audio 660
+snd/timer	root:audio 660
+
+# input stuff
+input/event[0-9]+	root:root 640
+input/mice		root:root 640
+input/mouse[0-9]	root:root 640
+input/ts[0-9]		root:root 600
+
+# load modules
+$MODALIAS=.*	root:root 660 @modprobe "$MODALIAS"

software/buildroot/configs/iob_soc_defconfig

@@ -4,13 +4,13 @@ BR2_CCACHE_DIR="$(HOME)/.buildroot-ccache-saxon_default"
 
 ## Target options
 BR2_riscv=y
-BR2_RISCV_32=y
 
 ## Instruction Set Extensions
 BR2_riscv_custom=y
-BR2_RISCV_ISA_CUSTOM_RVM=y
-BR2_RISCV_ISA_CUSTOM_RVA=y
-BR2_RISCV_ISA_CUSTOM_RVC=y
+BR2_RISCV_ISA_RVM=y
+BR2_RISCV_ISA_RVA=y
+BR2_RISCV_ISA_RVC=y
+BR2_RISCV_32=y
 BR2_RISCV_ABI_ILP32=y
 
 ## Linux headers same as kernel