ace-buildroot

Buildroot External template generator

Usage

Init minimal buildroot external

1. Tweak the configuration file br-external.conf
2. Run make to quickly setup a layout of a br2-external tree as document

Buildroot Configuration

1. Run make build-container to config buildroot
2. Run the following cmds in sequence to tweak buildroot/kernel/busybox config

make menuconfig
make kernalconfig
make busyboxconfig

3. Run make to generate a QEMU disk image
4. Run make boot-img to launch QEMU

Note:
you can find all buildroot configs in br2_external/configs and extra packages tarball in br2_external/dl
Highly recommend to track them with git, especially using git-lfs to store the files in br2_external/dl

TODO

1. Use git lfs to store packages in $(BASEDIR)/dl
2. Enable CCACHE

Known Issues

BUILDROOT ip: can't find device eth0

Press ctrl+a+c to qemu cli, and run info network (or info pci), we can find the default net device model is e1000.

(qemu) info network
hub 0
\ hub0port1: user.0: index=0,type=user,net=10.0.2.0,restrict=off
\ hub0port0: e1000.0: index=0,type=nic,model=e1000,macaddr=52:54:00:12:34:56

so there are two ways to solve this.

1. Enable e1000 driver and ensure CONFIG_E1000=y in linux.config

make linux-menuconfig
Device drivers —>
Network device support —>
Ethernet driver support—>
<*>     Intel(R) PRO/1000 Gigabit Ethernet support               
<*>     Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support

2. Run qemu with -net nic,model=virtio -net user options, refer to this and you might need to know why Qemu user mode networking doesn't work

Can't find buildroot login prompt using qemu

Use qemu_x86_defconfig for qemu-system-i386. Change tty1 to ttyS0 for using QEMU nographic option, refer to Build buildroot and run QEMU

/boot/bzImage not found when qemu booting up.

Enable Install kernel image to /boot in target in the kernel menu to populate a /boot directory with bzImage, refer to Notes on using Grub2 for ARM u-boot-based platforms

Reference

• guestfs-faq
• BIOS boot partition
• Why does the partition start on sector 2048 instead of 63?
• How to Setup QEMU Output to Console and Automate Using Shell Script