Build&Integration systems

Build systems

Yocto

OpenWRT

OpenWrt is described as a Linux distribution for embedded devices.

$ git clone git://github.com/openwrt/openwrt.git && cd openwrt
$ make menuconfig
  [choose Target System (like Broadcom BCM63xx or Malta if you want Qemu) and then Target Profile (like Netgear DG834G v4)]
$ make -j 8

Some of the targets available are

clean
dirclean
distclean
defconfig
menuconfig

If you want to test it into Qemu you can launch it with the following oneliner (for more info look at the wiki)

$ qemu-system-mipsel -kernel bin/malta/openwrt-malta-le-vmlinux-initramfs.elf -nographic -m 256
[    0.000000] Linux version 3.18.45 (packz@durruti) (gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r49389) ) #2 SMP Sun May 14 20:02:35 CEST 2017
[    0.000000] Early serial console at I/O port 0x3f8 (options '38400n8')
[    0.000000] bootconsole [uart0] enabled
 ...
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[    5.000000] procd: - early -
[    6.110000] procd: - ubus -
[    7.160000] procd: - init -
Please press Enter to activate this console.


BusyBox v1.23.2 (2017-05-14 19:59:13 CEST) built-in shell (ash)

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 CHAOS CALMER (Chaos Calmer, r49389)
 -----------------------------------------------------
  * 1 1/2 oz Gin            Shake with a glassful
  * 1/4 oz Triple Sec       of broken ice and pour
  * 3/4 oz Lime Juice       unstrained into a goblet.
  * 1 1/2 oz Orange Juice
  * 1 tsp. Grenadine Syrup
 -----------------------------------------------------
root@(none):/#

Multistrap

In order to generate a rootfs for testing on QEMU of architecture on your desktop you can use multistrap

$ sudo multistrap -a mips -d /tmp/RFS -f mips-multistrap.conf
$ sudo mount -o bind /dev/ /tmp/RFS/dev/
$ sudo cp /usr/bin/qemu-mips-static /tmp/RFS/usr/bin/
$ sudo LC_ALL=C LANGUAGE=C LANG=C chroot /tmp/RFS/ dpkg --configure -a

After that mith binfmt-support is possible to use a chroot directly

$ uname -a
Linux 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2 (2017-06-12) x86_64 GNU/Linux
$ sudo chroot /tmp/RFS/ /bin/bash
/# uname -a
Linux 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2 (2017-06-12) mips GNU/Linux

Mips in Debian

Some hints from this answer

# apt-get install emdebian-archive-keyring
# tee /etc/apt/sources.list.d/emdebian.list << EOF
deb http://mirrors.mit.edu/debian squeeze main
deb http://www.emdebian.org/debian squeeze main
EOF
# apt-get update
# apt-get install libc6-mipsel-cross
# apt-get install gcc-mipsel-linux-gnu