Supported Devices

Raspberrypi

Introduction

The raspberrypi is a credit card sized single-board computer based on Broadcom BCM2835 (ARM1176JZF-S 700 MHz)

CPU Information Processor : ARMv6-compatible processor rev 7 (v6l) BogoMIPS : 697.95 Features : swp half thumb fastmult vfp edsp java tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x0 CPU part : 0xb76 CPU revision : 7 Hardware : BCM2708 Revision : 0002 Serial : 000000001d747c36 boot.log

Installation

Booting the release from SD (or external device)

• To install the current release we need to setup an SD card or an external USB device with one vfat partition (the first one)

and a second partition to uncompress the release and current kernel modules.kernel.img_3.6.1_20151024

• On the first partition we need:
  • boot needed files
    • bootcode.bin cmdline.txt config.txt kernel.img start.elf
  • kernel.img_3.6.1_20151024 rename it to kernel.img
  • cmdline-mmcblkp2_tty1.txt rename it to cmdline.txt
  • cmdline-sda1_tty1.txt This exampe shows a modification to boot from USB
• Second partition:
  • Filesystem used should be supported by current kernel.
  • crux-arm-rootfs-3.2-raspberrypi.tar.xz (last rootfs released)
  • modules-3.6.1-raspberrypi_20130305.tar.xz (Raspberrypi linux kernel modules)

Media installer preparation (development)

• For the install media you will need a SD card with at least one 128MB vfat partition
• Mount the first partition and place these files at top level dir:
  • boot needed files
  • kernel.img_3.6.1_20151024 rename it to kernel.img
    • They provide a kernel but you can update it with ours.
  • initrd.gz or initramfs.cpio
  • cmdline-ramdisk.txt rename it to cmdline.txt
    • Note that if you only have serial console access to install then you will use this file: cmdline-ramdisk_serial.txt
  • modules-3.6.1-raspberrypi_20130305.tar.xz (Raspberrypi linux kernel modules)
  • crux-arm-rootfs-3.2-raspberrypi.tar.xz (last rootfs released)
• To finish media preparation then you should create one more file at top level dir:

$ touch <mount-dir>/crux-media

Booting from the media installer initrd

• Mount the partition on which you want to install

$ mount /dev/sd?? /mnt

• Uncompress latest rootfs

$ tar -C /mnt -pxvf /media/crux-arm-rootfs-3.2-raspberrypi.tar.xz

• Uncompress linux kernel modules

$ tar -C /mnt -pxvf /media/modules-3.6.11-raspberrypi_20130305.tar.xz

• Now you need to update cmdline.txt to boot from your new rootfs partition specifying rootfs partition, file system type and console if necessary. Examples:

smsc95xx.turbo_mode=N dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext2 rootwait

• Booting from second SD's partition using ext2 file system.

smsc95xx.turbo_mode=N dwc_otg.lpm_enable=0 console=tty1 root=/dev/sda1 rootfstype=ext4 rootwait

• Booting from first USB device using ext4 file system.

• Now it's time to do basic system configuration

Configuration

We should setup all the important files: inittab, securetty, fstab, rc.conf, net ...

Serial Console

To obtain serial access we need to make some modifications to two files:

• Adding in /etc/inittab:

s0:12345:respawn:/sbin/agetty 115200 ttyAMA0 vt100

• and in /etc/securetty:

ttyAMA0