..

BeagleBone BusyBox RFS

Using the toolchain I built previously in the BeagleBone Black from Scratch

Clone Buildroot

git clone https://gitlab.com/buildroot.org/buildroot.git
git checkout -b 2024.02

ncurses fix for menuconfig

  • its not the exact file/location but you can infer
diff --git a/tools/kconfig/lxdialog/check-lxdialog.sh b/tools/kconfig/lxdialog/check-lxdialog.sh
index e9daa627..6408baae 100755
--- a/tools/kconfig/lxdialog/check-lxdialog.sh
+++ b/tools/kconfig/lxdialog/check-lxdialog.sh
@@ -63,7 +63,7 @@ trap "rm -f $tmp ${tmp%.tmp}.d" 0 1 2 3 15
 check() {
         $cc -x c - -o $tmp 2>/dev/null <<'EOF'
 #include CURSES_LOC
-main() {}
+int main() {}
 EOF
 	if [ $? != 0 ]; then
 	    echo " *** Unable to find the ncurses libraries or the"       1>&2

make menuconfig

Target Options

  • Target Architecture: Arm (little endian)
  • Target Architecture Variant: cortex-A8
  • Target ABI: EABIhf
  • Floating Point Strategy: NEON
  • ARM instruction set: ARM
  • Target Binary Format: ELF

Toolchain

  • Toolchain type: External
  • Toolchain: Custom toolchain
  • Toolchain origin: Pre-installed toolchain
  • Toolchain path: ../../x-tools/arm-cortex_a8-linux-gnueabihf
  • External toolchain gcc version: 13.x
  • External kernel headers series: 5.15.x
  • SSP support & SSP strong support: y
  • C++ support: y

System Configuration

  • set the hostname
  • set the system banner
  • enabled root login with password and run a getty after boot

(Optional) Modify the busybox config

If you want to make more specific changes to the RFS. You’ll probably have to do the same ncurses fix if you’re on Arch

make busybox-menuconfig

Build

make

libffi work around

I had an issue building libffi 3.4.2 due to my gcc version being too high. Just updated its config with a new a newer package.

diff --git a/package/libffi/libffi.mk b/package/libffi/libffi.mk
index 6249023eae..d3e3e1e1a9 100644
--- a/package/libffi/libffi.mk
+++ b/package/libffi/libffi.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################

-LIBFFI_VERSION = 3.4.4
+LIBFFI_VERSION = 3.4.6
 LIBFFI_SITE = \
 	https://github.com/libffi/libffi/releases/download/v$(LIBFFI_VERSION)
 LIBFFI_LICENSE = MIT
diff --git a/package/libffi/libffi.hash b/package/libffi/libffi.hash
index 8d2349ec21..a4326eb9cc 100644
--- a/package/libffi/libffi.hash
+++ b/package/libffi/libffi.hash
@@ -1,4 +1,5 @@
 # Locally calculated
 sha256  d66c56ad259a82cf2a9dfc408b32bf5da52371500b84745f7fb8b645712df676  libffi-3.4.4.tar.gz
+sha256  b0dea9df23c863a7a50e825440f3ebffabd65df1497108e5d437747843895a4e  libffi-3.4.6.tar.gz
 # License files, locally calculated
 sha256  2c9c2acb9743e6b007b91350475308aee44691d96aa20eacef8e199988c8c388  LICENSE

Format the sd card bruh

sdb is my sdcard

sudo cfdisk /dev/sdb
sdb1 (boot)
- 128M, FAT32, bootable flag
sdb2 (rfs)
- Rest of the storage space, Linux (ext4)

sudo mkfs.vfat -a -F 32 -n boot /dev/sdb1
sudo mkfs.ext4 -L rootfs -E nodiscard /dev/sdb2

“-E nodiscard disables bad block discarding. While this should be a useful option for cards with bad blocks, skipping this step saves long minutes in SD cards” - nerds at bootlin

Remove the sd card and plug it back in

the rootfs.tar is located at busybox/output/images

sudo mkdir -p /mnt/boot
sudo mkdir -p /mnt/rootfs
sudo mount /dev/sdb1 /mnt/boot
sudo mount /dev/sdb2 /mnt/rootfs

cp MLO am335x-boneblack.dtb u-boot.img zImage /mnt/boot
sudo tar -C /mnt/rootfs -xf rootfs.tar

Create extlinux.conf

mkdir /mnt/boot/extlinux
${EDITOR} /mnt/boot/extlinux/extlinux.conf

label buildroot
	kernel /zImage
	devicetree /am335x-boneblack-wireless.dtb
	append console=ttyO0,115200 root=/dev/mmcblk0p2 rootwait

Boot

ifconfig eth0 up
ifconfig eth0 192.168.1.101
#host
sudo ip addr add 192.168.1.100/24 dev eno1