iMX6 TinyRex Ultra U-Boot

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U-boot is a bootloader responsible for hardware initialization, loading and booting linux kernel. It is also used for module flashing.

Build

Set toolchain

Export toolchain variables for every related terminal session.

Initial steps

Create working directory 

mkdir -pv ~/workdir/imx6/bootloader/

U-Boot v2015.04

Download & Extract source code

cd ~/workdir/imx6/bootloader/
git clone -b uboot-imx-v2015.04 --single-branch https://github.com/voipac/uboot-imx uboot-imx-v2015.04-rex
cd uboot-imx-v2015.04-rex

Compile

Output file is called u-boot.imx

Compile for SD3 and Linux/Yocto

cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6tinyrexultra_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp -av u-boot.imx /srv/tftp/imx6/u-boot-imx6-tinyrexultra.imx

Compile for SD3 and Android 7.x

cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6tinyrexultraandroid_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp -av u-boot.imx /srv/tftp/imx6/u-boot-imx6-tinyrexultraandroid.imx

Compile for SPI1 and Linux/Yocto

cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6tinyrexultrarecovery_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp -av u-boot.imx /srv/tftp/imx6/u-boot-imx6-tinyrexultrarecovery.imx

Compile for SATA

cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6tinyrexultrasata_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp -av u-boot.imx /srv/tftp/imx6/u-boot-imx6-tinyrexultrasata.imx

How to Flash new version

Flash Normal image on SD3

sudo dd if=u-boot-imx6-tinyrex*.imx of=/dev/sdc bs=1k seek=1 skip=0 oflag=dsync

Flash Recovery image on SPI1

setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6-tinyrex*recovery.imx
if sf probe 0:0; then sf erase 0x0 0x80000;sf write 0x10800000 0x400 0x7fc00; fi

Log during flashing 

U-Boot 2015.04-g9de6034-dirty (Jan 08 2017 - 18:27:05)

CPU:   Freescale i.MX6D rev1.2 at 792 MHz
CPU:   Temperature 32 C
Reset cause: POR
Board: MX6 TinyRex - pro
I2C:   ready
DRAM:  1 GiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
Card did not respond to voltage select!
MMC init failed
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   FEC [PRIME]
Boot from USB for mfgtools
Use default environment for                              mfgtools
Run bootcmd_mfg: <NULL>
TinyRex U-Boot > setenv ipaddr 192.168.1.150
TinyRex U-Boot > setenv serverip 192.168.1.1
TinyRex U-Boot > mw.b 0x10800000 0xFF 0x80000
TinyRex U-Boot > tftp 0x10800000 imx6/u-boot-imx6-tinyrexprorecovery.imx
Using FEC device
TFTP from server 192.168.1.1; our IP address is 192.168.1.150
Filename 'imx6/u-boot-imx6-tinyrexprorecovery.imx'.
Load address: 0x10800000
Loading: #######################
         3.5 MiB/s
done
Bytes transferred = 334848 (51c00 hex)
TinyRex U-Boot > sf probe 0:0;sf erase 0x0 0x80000;sf write 0x10800000 0x400 0x7fc00
SF: Detected SST25VF032B with page size 256 Bytes, erase size 4 KiB, total 4 MiB
SF: 524288 bytes @ 0x0 Erased: OK
SF: 523264 bytes @ 0x400 Written: OK
TinyRex U-Boot >

Flash on SATA

setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6-tinyrex*sata.imx
if sata init; then sata write 0x10800000 0x2 0x3ff; fi

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