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Building a Yocto image for the UDOO Neo

Introduction

In a previous post I described how to run a prebuilt Yocto Project image on my UDOO Neo.

This post explains how to build the micro SD card image directly from sources.

References

Step-by-step instructions

Building the image from sources

Testing the image on the target

  • Download file core-image-minimal-udooneo-20151114142058.rootfs.sdcard

    gmacario@ITM-GMACARIO-W7 ~/Downloads
$ md5sum core-image-minimal-udooneo-20151114142058.rootfs.sdcard
610e75f4410cd70e32e3bb90e4edabd9 *core-image-minimal-udooneo-20151114142058.rootfs.sdcard

gmacario@ITM-GMACARIO-W7 ~/Downloads
$

  • Write the *.rootfs.sdcard file (i.e. on Windows, use Win32DiskImager) onto a blank Micro SD

  • Insert the Micro SD

  • Watch U-Boot and Linux console messages on the debug serial

    ``` U-Boot 2014.04 (Nov 14 2015 - 16:02:05)

    CPU: Freescale i.MX6SX rev1.2 at 792 MHz

    CPU: Temperature 35 C, calibration data: 0x59b50469

    Reset cause: POR

    Board: MX6SX UDOO NEO

    I2C: ready

    DRAM: 1 GiB

    MMC: FSL_SDHC: 0, FSL_SDHC: 1

    *** Warning - bad CRC, using default environment

    In: serial

    Out: serial

    Err: serial

    Found PFUZE300! deviceid 0x30, revid 0x11

    Net: CPU Net Initialization Failed

    No ethernet found.

    Normal Boot

    Hit any key to stop autoboot: 3 2 1 0

    mmc0 is current device

    reading uEnv.txt

    ** Unable to read file uEnv.txt **

    reading /zImage

    4399520 bytes read in 247 ms (17 MiB/s)

    Booting from mmc ...

    reading imx6sx-udoo-neo-hdmi-m4.dtb

    39414 bytes read in 19 ms (2 MiB/s)

    Kernel image @ 0x80800000 [ 0x000000 - 0x4321a0 ]

    Flattened Device Tree blob at 83000000

    Booting using the fdt blob at 0x83000000

    Using Device Tree in place at 83000000, end 8300c9f5

    sono entrato in ldo_mode_set

    setto i valori

    valore di vddarm 19

    switch to ldo_bypass mode!

    Starting kernel ...

    [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 3.14.28_1.0.0_ga-udooboard+gb15f827 (root@148b793524e5) (gcc version 4.9.1 (GCC) ) #1 SMP PREEMPT Sat Nov 14 14:51:58 UTC 2015 [ 0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] Machine model: UDoo Neo (based on imx6 SoloX) [ 0.000000] Reserved memory: reserved region for node 'm4@0x84000000': base 0x84000000, size 8 MiB [ 0.000000] cma: CMA: reserved 320 MiB at aa000000 [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] PERCPU: Embedded 8 pages/cpu @bf63c000 s9152 r8192 d15424 u32768 [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 257794 [ 0.000000] Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk0p2 rootwait rw consoleblank=0 [ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes) [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) [ 0.000000] Memory: 690168K/1039360K available (5058K kernel code, 332K rwdata, 5656K rodata, 260K init, 384K bss, 349192K reserved, 0K highmem) [ 0.000000] Virtual kernel memory layout: ...


  [Complete logfile](/images/20151115-1206-core-image-minimal-udooneo-20151114142058.txt)

- When getting the `udooneo login:` prompt

Poky (Yocto Project Reference Distro) 1.7.1 udooneo /dev/ttymxc0

udooneo login:

login as `root` (the default image has no password)

### Some commands to inspect the target

#### df -h

root@udooneo:# df -h Filesystem Size Used Available Use% Mounted on /dev/root 6.7M 4.7M 1.6M 75% / devtmpfs 337.0M 0 337.0M 0% /dev tmpfs 497.1M 88.0K 497.0M 0% /run tmpfs 497.1M 56.0K 497.1M 0% /var/volatile root@udooneo:#


#### cat /proc/cpuinfo

root@udooneo:~# cat /proc/cpuinfo processor : 0 model name : ARMv7 Processor rev 10 (v7l) Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpd32 CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x2 CPU part : 0xc09 CPU revision : 10

Hardware : Freescale i.MX6 SoloX (Device Tree) Revision : 0000 Serial : 0000000000000000 root@udooneo:~#


#### cat /proc/version

root@udooneo:# cat /proc/version Linux version 3.14.28_1.0.0_ga-udooboard+gb15f827 (root@148b793524e5) (gcc version 4.9.1 (GCC) ) #1 SMP PREEMPT Sat Nov 14 14:51:58 UTC 2015 root@udooneo:#


#### ifconfig -a

root@udooneo:~# ifconfig -a eth0 Link encap:Ethernet HWaddr 00:C0:08:8C:14:E6 inet addr:192.168.64.107 Bcast:192.168.64.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:264 errors:0 dropped:0 overruns:0 frame:0 TX packets:2 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:30071 (29.3 KiB) TX bytes:684 (684.0 B)

lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

root@udooneo:~#


**NOTE:** The (wired) Ethernet cable was connected to my home network, so I can test Internet connection:

root@udooneo:~# ping -c 5 www.cisco.com PING www.cisco.com (95.100.224.170): 56 data bytes 64 bytes from 95.100.224.170: seq=0 ttl=55 time=7.091 ms 64 bytes from 95.100.224.170: seq=1 ttl=55 time=103.499 ms 64 bytes from 95.100.224.170: seq=2 ttl=55 time=23.828 ms 64 bytes from 95.100.224.170: seq=3 ttl=55 time=7.683 ms 64 bytes from 95.100.224.170: seq=4 ttl=55 time=7.321 ms

--- www.cisco.com ping statistics --- 5 packets transmitted, 5 packets received, 0% packet loss round-trip min/avg/max = 7.091/29.884/103.499 ms root@udooneo:~#


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