Supported Devices

EfikaMX SmartTop

Introduction

The EFIKA MX Smarttop is a network computer based on Freescale i.MX515 (ARM Cortex-A8 800MHz).

CPU Information Processor : ARMv7 Processor rev 5 (v7l) BogoMIPS : 799.53 Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x2 CPU part : 0xc08 CPU revision : 5 Hardware : Genesi Efika MX (Smarttop) Revision : 51030 Serial : 0000000000000000 boot.log

Installation

Media preparation

• For the install media you will need a SD card with at least one 100MB ext2 partition
• Mount the first partition and place these files at top level dir:
  • boot-ramdisk.scr (bootloader for efikamx device)
    • After download then rename it to boot.scr which is the name used by u-boot to boot correctly
    • Note that if you only have a serial console way to install then you will use this file: boot-ramdisk_serial.scr
  • uImage-2.6.31.14.27-efikamx_20130723 (linux kernel image coverted to u-boot format)
    • After download then rename it to uImage which is the name used by boot.scr
  • uInitrd (initrd.gz image converted to u-boot format)
  • modules-2.6.31.14.27-efikamx_20130723.tar.xz (linux kernel modules for efikamx device)
  • crux-arm-rootfs-3.1-efikamx.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

• Mount the partition on which you want to install

$ mount /dev/sd?? /mnt

• Uncompress latest rootfs

$ tar -C /mnt -pxvf /media/crux-arm-rootfs-3.1-efikamx.tar.xz

• Uncompress linux kernel modules

$ tar -C /mnt -pxvf /media/modules-2.6.31.14.27-efikamx_20130723.tar.xz

• Copy linux kernel image
  (This step is not required if you want to install in a secondary partition on the same SD used to boot)

$ cp /media/uImage /mnt

• Copy boot.scr
  • To install on efikamx internal hard drive (with root=/dev/sda1):
    • Download boot-sda.scr or boot-sda_serial.scr if you only will use the serial console
    • Copy to /mnt and rename it to boot.scr
  • To install in the secondary partition on the same SD you used to boot (with root=/dev/mmcblkp2):
    • Download boot-mmc.scr or boot-mmc_serial.scr if you only will use the serial console
    • Copy to /media (the first partition of SD) and rename it to boot.scr
• 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 ttymxc0 vt100

• and in /etc/securetty:

ttymxc0

• In the client side (using minicom here) it's needed to disable hardware flow control to get input events working.

Wifi

• You should install rt2870usb-firmware from efikamx-arm repository:

# prt-get install rt2870usb-firmware

Audio Support

• Add audio modules to /etc/rc.modules in the right order:

modprobe snd_spdif
modprobe snd_soc_imx_3stack_sgtl5000

Sysctl Tricks

• Add these values to /etc/sysctl.conf:

vm.lowmem_reserve_ratio=1
vm.min_free_kbytes=16384

Udev Rules

• Add these values to/etc/udev/rules.d/10-imx.rules

# Anyone has readonly permission to IIM device file
KERNEL=="mxc_iim",  MODE="0444", SYMLINK+="mxc_mem"
KERNEL=="mxc_ipu",  MODE="0666"
KERNEL=="fb0",      MODE="0666"
KERNEL=="fb1",      MODE="0666"
KERNEL=="fb2",      MODE="0666"
KERNEL=="mxc_vpu",  MODE="0666"
SUBSYSTEM=="video", MODE="0666"
KERNEL=="gsl_kmod", MODE="0666"