NetBSD workshop (4hours)

1. NetBSD workshop
Jun Ebihara
jun@soum.co.jp
jun@netbsd.org

2. OverView in 4hours
● Install NetBSD/i386 on VirtualBox
– Make earmv6hf cross-compiling toolchain
– Make RPI kernel
● Install NetBSD/earmv6hf on RPI
– Play RPI with NetBSD
– Feel difference between your favorite environment
● Copy your RPI kernel to RPI
– Update NetBSD-current kernel
● Boot RPI with your cross-compiled kernel

3. Hardwares
● Windows 10 PC with VirtualBox
● Raspberry PI
– MicroSD Card: 4 or 8GB class 10
– HDMI Display
– USB Keyboard/mouse
– USB power supply
– Ethernet Cable
● Internet access via Ethernet Cable
– RPI get IP address via DHCP
– RPI set time via NTP

4. Pre-Downloading
● NetBSD-7.0.1.i386.iso
● src.tar.gz
● VirtualBox
● Rawrite32.exe
● RPI Image
– 2016-07-29-netbsd-earmv6hf.img.gz

5. VirtualBox
● NetBSD on VirtualBox
● NetBSD-7.0.1-i386.iso
● cd /usr
● ftp
http://cdn.netbsd.org/pub/NetBSD/NetBSD-current/tar_files/src.tar.gz
● tar xzvf src.tar.gz

6. NetBSD RPI Image
● on Windows
● http://cdn.netbsd.org/pub/NetBSD/misc/jun/raspberry-
pi/2016-07-29-earmv6hf/2016-07-29-netbsd-raspi-
earmv6hf.img.gz
● http://www.netbsd.org/~martin/rawrite32/download.html
● Use rawrite32 to write RPI image to microSD
● Connect RPI:
● Boot
● Wait 10 min to resize partition

7. Using RPI image
● Login: root
● startx
● medit
● mikutter
● mlterm-fb
● omxplayer & youtube-dl
– pkg_add omxplayer
– pkg_add youtube-dl

8. PaX
● Some application exec failed on starting
● sysctl -a |grep pax
– security.pax.mprotect.enabled = 1
– security.pax.mprotect.global = 1
– security.pax.mprotect.ptrace = 1
– security.pax.mprotect.debug = 1
– security.pax.segvguard.enabled = 1
– security.pax.segvguard.global = 1
● Loooose protection: (bad manner)
– sysctl -w security.pax.mprotect.enabled=0

9. NTP time setting
● ntpq -p
● /etc/rc.d/ntpd stop
● /etc/rc.d/ntpdate start
● /etc/rc.d/ntpd start
● ntpq -p

10. Reboot and / mount failed
● Power supply cut down failure
– make file system damaged
● Reboot but / read only access
● drop on single usermode
– df
– fsck /dev/ld0a
– reboot
● /etc/fstab
– add “log,noatime”
– man 5 fstab

11. /etc/rc.conf
● sshd=YES
● ntpd=YES
● hostname=nandemoii

12. Kernel cross build
● cd /usr/src
● ./build.sh -j 6 -u -U -m evbarm -a earmv6hf
tools
● ./build.sh -j 6 -u -U -m evbarm -a earmv6hf
kernel=RPI
● Copy netbsd.bin to /boot/kernel.img

13. Kernel cross build for RPI2
● cd /usr/src
● ./build.sh -j 6 -u -U -m evbarm -a earmv6hf tools
● ./build.sh -j 6 -u -U -m evbarm -a earmv6hf kernel=RPI2
● Copy netbsd.bin to /boot/kernel7.img
● src/sys/arch/arm/broadcom/bcm2835_bsc.c:91
– if (strcmp(aaa->aaa_name, "bcmbsc") != 0) return 0;
– + if (aaa->aaa_addr == BCM2835_BSC0_BASE)
– + return 0;