Latest revision as of 18:48, 31 July 2016

VAR-SOM-MX6 - eMMC Flash Burning Dart

Introduction

Variscite DART-MX6 SOM uses eMMC to boot.

NOTE:
This WIKI is only valid for DART-MX6.

Yocto Build results

The resulted images are locaated in tmp/deploy/images/var-som-mx6.
Looking at tmp/deploy/images/var-som-mx6 you will find 6 main files that are linked to the actual file

Image Name	How to use
fsl-image-qt5-minimal-var-som-mx6.ext3	Not in Use
fsl-image-qt5-minimal-var-som-mx6.sdcard	This image is for SD-Card boot. Default u-boot is built for SDCARD. Booting from SD-Card is explained in details below. See section 8.1 below for the sdcard structure.
fsl-image-qt5-minimal-var-som-mx6.tar.bz2	Used to create an NFS root file system on the host. See apendix for setting an NFS server
fsl-image-qt5-minimal-var-som-mx6.ubi	Use the sdcard created above. Copy the file into it and use the following commands to flash them into nand. Coping files (mount the sd-card created above first):
uImage	Linux kernel image
SPL-nand,u-boot-nand-2014.04-r0.img	SPl and u-boot built for nand
SPL-sd,u-boot-sd-2014.04-r0.img	SPl and u-boot built for sdcard/eMMC
Device Tree Name	SOM type	Carrier Board type	LCD Type	Evaluation Kit name
uImage-imx6q-var-som.dtb	VAR-SOM-MX6_V2 (Quad / Dual)	VAR-MX6CustomBoard	Capacitive/Resistive touch	VAR-DVK-MX6_V2-PRO VAR-STK-MX6_V2
uImage-imx6q-var-som-vsc.dtb	VAR-SOM-MX6_V2 (Quad / Dual)	VAR-SOLOCustomBoard	Capacitive LVDS touch	N/A
uImage-imx6dl-var-som.dtb	VAR-SOM-MX6_V2 (DualLite/ Solo)	VAR-MX6CustomBoard	Capacitive/Resistive touch	N/A
uImage-imx6dl-var-som-solo-vsc.dtb	VAR-SOM-SOLO / VAR-SOM-DUAL	VAR-SOLOCustomBoard	Capacitive LVDS touch	VAR-DVK-SOLO/DUAL VAR-STK-SOLO/DUAL
uImage-imx6dl-var-som-solo.dtb	VAR-SOM-SOLO / VAR-SOM-DUAL	VAR-MX6CustomBoard	Capacitive/Resistive touch	N/A
uImage-imx6q-var-dart.dtb	VAR-SOM-SOLO / VAR-SOM-DUAL	VAR-DT6CustomBoard	Capacitive LVDS touch	VAR-STK-DT6.VAR-DVK-DT6

NAND recovery file tree

We copy the image files into the NAND recovery utility. We also change the names of the products above. The NAND recovery utlity contains Android and Yocto.

/media/rootfs/opt/images/
├── Android
│   └── Emmc
│       ├── boot.img
│       ├── boot-imx6q-var-dart.img
│       ├── boot-som-mx6dl-c.img
│       ├── boot-som-mx6dl-r.img
│       ├── boot-som-mx6q-c.img
│       ├── boot-som-mx6q-r.img
│       ├── boot-som-mx6q-vsc.img
│       ├── boot-som-solo-c.img
│       ├── boot-som-solo-r.img
│       ├── boot-som-solo-vsc.img
│       ├── recovery.img
│       ├── recovery-imx6q-var-dart.img
│       ├── recovery-som-mx6dl-c.img
│       ├── recovery-som-mx6dl-r.img
│       ├── recovery-som-mx6q-c.img
│       ├── recovery-som-mx6q-r.img
│       ├── recovery-som-mx6q-vsc.img
│       ├── recovery-som-solo-c.img
│       ├── recovery-som-solo-r.img
│       ├── recovery-som-solo-vsc.img
│       ├── SPL
│       ├── SPL.mmc
│       ├── SPL.new
│       ├── system.img
│       ├── u-boot-var-imx6-nand.img
│       └── u-boot-var-imx6-sd.img
└── Yocto
    ├── rootfs.tar.bz2
    ├── rootfs.ubi.img
    ├── SPL
    ├── SPL.mmc
    ├── u-boot.img
    ├── u-boot.img.mmc
    ├── uImage
    ├── uImage-imx6dl-var-som.dtb
    ├── uImage-imx6dl-var-som-solo.dtb
    ├── uImage-imx6dl-var-som-solo-vsc.dtb
    ├── uImage-imx6q-var-dart.dtb
    ├── uImage-imx6q-var-som.dtb
    └── uImage-imx6q-var-som-vsc.dtb

Script files located on /media/rootfs/sbin/
android-emmc.sh
mkmmc_yocto.sh    
yocto-dart.sh  
yocto-nand.sh
mkmmc_android.sh
nand-recovery.sh
yocto-emmc.sh

Copy Yocto files into SDCARD

Plug the NAND recovery SDCARD into your host machine. Then your host machine should mount the rootfs partition on /media/rootfs.

$ export YOCTO_ROOT=~/var-som-mx6-yocto-fido

$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/uImage /media/rootfs/opt/images/Yocto
$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/fsl-image-qt5-var-som-mx6.tar.bz2 /media/rootfs/opt/images/Yocto/rootfs.tar.bz2
$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/fsl-image-qt5-minimal-var-som-mx6.ubi /media/rootfs/opt/images/Yocto/rootfs.ubi.img

$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/uImage-imx6dl-var-som-solo.dtb /media/rootfs/opt/images/Yocto/
$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/uImage-imx6dl-var-som-solo-vsc.dtb /media/rootfs/opt/images/Yocto/
$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/uImage-imx6dl-var-som.dtb /media/rootfs/opt/images/Yocto/
$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/uImage-imx6q-var-som.dtb /media/rootfs/opt/images/Yocto/
$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/uImage-imx6q-var-som-vsc.dtb /media/rootfs/opt/images/Yocto/
$ sudo cp ${YOCTO_ROOT}/build_x11/tmp/deploy/images/var-som-mx6/uImage-imx6q-var-dart.dtb /media/rootfs/opt/images/Yocto/

Flash File System to eMMC

Flashing eMMC is a complex task. It requires several steps including partition, format and untar the file system. We highly recommend to use our provided scripts to perform this task. Assuming that you use our NAND recovery utility.

Make sure the eMMC is not mounted.

$ cd /opt/images/Yocto
$ umount /dev/mmcblk1p*
$ node=/dev/mmcblk2

Delete all partition from the eMMC.

$ fdisk ${node} <<EOF
d
1
d
2
d
3
d
w
EOF

$ sync

Delete MBR

$ dd if=/dev/zero of=${node} bs=512 count=1000
$ sync

Call fdisk to create partition table

$ fdisk /dev/mmcblk2 <<EOF 
n
p
1
8192
24575
t
c
n
p
2
24576

p
w
EOF

Format eMMC

$ umount /run/media/mmcblk2p1 2>/dev/null
$ umount /run/media/mmcblk2p2 2>/dev/null
$ mkfs.vfat /dev/mmcblk2p1 -nBOT_varsomi
$ mkfs.ext4 /dev/mmcblk2p2 -Lrootfs
$ sync

Flash u-boot

$ cd /opt/images/Yocto
$ sudo dd if=u-boot.img.mmc of=/dev/mmcblk2 bs=1K seek=69; sync
$ sudo dd if=SPL.mmc of=/dev/mmcblk2 bs=1K seek=1; sync

Flash Yocto BOOT partition

$ mkdir -p /tmp/media/mmcblk2p1
$ mount -t vfat /dev/mmcblk2p1  /tmp/media/mmcblk2p1
$ cp uImage-imx6q-var-dart.dtb /tmp/media/mmcblk2p1/imx6q-var-dart.dtb
$ cp uImage /tmp/media/mmcblk2p1/uImage
$ umount /tmp/media/mmcblk2p1

Flashing Yocto Root file System

$ mount /dev/mmcblk2p2  /tmp/media/mmcblk2p2
$ mkdir -p /tmp/media/mmcblk2p2
$ rm -rf /tmp/media/mmcblk2p2/*
$ tar xvpf rootfs.tar.bz2 -C /tmp/media/mmcblk2p2/
$ umount /tmp/media/mmcblk2p2

Summary

We describe the results of Yocto build, how to copy it to SDCARD and how to flash it to eMMC. This page is only valid for DART-MX6. With the NAND recovery utility we provide a set of scripts located on /sbin and listed below. It is much safer to use them instead of the manual operation.
/media/rootfs/sbin/:
android-emmc.sh mkmmc_yocto.sh yocto-dart.sh yocto-nand.sh mkmmc_android.sh nand-recovery.sh yocto-emmc.sh. Some of the scripts are used by the others.
Please use:

android-emmc.sh to flash Android int eMMC
yocto-dart.sh To flash Yocto into eMMC on DART-MX6
yocto-nand.sh To flash Yocto into NAND (not relevant on DART-MX6)
yocto-emmc.sh To flash Yocto into eMMC (not relevant on DART-MX6)

VAR-SOM-MX6 NAND Flash Burning Dart: Difference between revisions