U-boot is a bootloader responsible for hardware initialization, loading and booting linux kernel. It is also used for module flashing.
Build
Export toolchain variables for every related terminal session.
Initial steps
Create working directory
mkdir -pv ~/workdir/imx6/bootloader/
Set shell variables
U-Boot v2015.04
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.
IMX6 Basic module (Production)
Linux/Yocto
cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6rexbasic_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexbasic.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexbasic.bin
Linux/Yocto
cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6rexpro_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexpro.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexpro.bin
Linux/Yocto - Version for SD card for usage in combination with iMX6DQ_SPI_to_uSDHC3.bin.
cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6rexprosd_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexprosd.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexprosd.bin
cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6rexprosata_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexprosata.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexprosata.bin
Android 7.x
cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6rexproandroid_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexproandroid.imx
IMX6 Ultra module (Production)
Linux/Yocto
cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6rexultra_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexultra.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexultra.bin
cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6rexultrasata_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexultrasata.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexultrasata.bin
Android 7.x
cd ~/workdir/imx6/bootloader/uboot-imx-v2015.04-rex
make distclean
make mx6rexultraandroid_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexultraandroid.imx
How to Flash new version
Steps
SPI - from U-boot
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
tftp 0x177ff400 imx6/u-boot-imx6-rex*.bin
go 0x17800000
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6-rex*.imx
if sf probe 2:2; then sf erase 0x0 0x80000; sf write 0x10800000 0x400 0x7fc00; fi
SATA - from U-boot
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
tftp 0x177ff400 imx6/u-boot-imx6-rex*.bin
go 0x17800000
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6-rex*sata.imx
if sata init; then sata write 0x10800000 0x2 0x3ff; fi
Log
U-Boot 2015.04-g3e8754e-dirty (May 08 2017 - 15:31:43)
CPU: Freescale i.MX6Q rev1.2 at 792 MHz
CPU: Temperature 42 C
Reset cause: WDOG
Board: MX6 Rex - pro
I2C: ready
DRAM: 2 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1
SF: Detected SST25VF032B with page size 256 Bytes, erase size 4 KiB, total 4 MiB
In: serial
Out: serial
Err: serial
Fastboot: Normal
flash target is MMC:0
Bad partition index:5 for partition:system
Bad partition index:4 for partition:data
Net: FEC [PRIME]
Normal Boot
Hit any key to stop autoboot: 0
Rex U-Boot > setenv ipaddr 192.168.1.150
Rex U-Boot > setenv serverip 192.168.1.1
Rex U-Boot > mw.b 0x10800000 0xFF 0x80000
Rex U-Boot > tftp 0x10800000 imx6/u-boot-imx6-rexpro.imx
Using FEC device
TFTP from server 192.168.1.1; our IP address is 192.168.1.150
Filename 'imx6/u-boot-imx6-rexpro.imx'.
Load address: 0x10800000
Loading: #######################
2.9 MiB/s
done
Bytes transferred = 330752 (50c00 hex)
Rex U-Boot > sf probe 2:2;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
Rex U-Boot >
U-Boot v2014.10
cd ~/workdir/imx6/bootloader/
git clone -b uboot-imx-v2014.10 --single-branch https://github.com/voipac/uboot-imx uboot-imx-v2014.10-rex
cd uboot-imx-v2014.10-rex
Compile
Output file is called u-boot.imx.
IMX6 DualLite module (Prototype)
Linux/Yocto
cd ~/workdir/imx6/bootloader/uboot-imx-v2014.10-rex
make distclean
make mx6dlrex_config
make
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6dl-rex.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6dl-rex.bin
IMX6 Basic module (Production)
Linux/Yocto
cd ~/workdir/imx6/bootloader/uboot-imx-v2014.10-rex
make distclean
make mx6rexbasic_config
make
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexbasic.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexbasic.bin
Linux/Yocto
cd ~/workdir/imx6/bootloader/uboot-imx-v2014.10-rex
make distclean
make mx6rexpro_config
make
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexpro.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexpro.bin
Linux/Yocto - Version for SD card for usage in combination with iMX6DQ_SPI_to_uSDHC3.bin.
cd ~/workdir/imx6/bootloader/uboot-imx-v2014.10-rex
make distclean
make mx6rexprosd_config
make
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexprosd.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexprosd.bin
IMX6 Ultra module (Production)
Linux/Yocto
cd ~/workdir/imx6/bootloader/uboot-imx-v2014.10-rex
make distclean
make mx6rexultra_config
make
cp u-boot.imx /srv/tftp/imx6/u-boot-imx6-rexultra.imx
cp u-boot.bin /srv/tftp/imx6/u-boot-imx6-rexultra.bin
How to Flash new version
IMX6 DualLite module (Prototype)
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
tftp 0x177ff400 imx6/u-boot-imx6dl-rex.bin
go 0x17800000
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6dl-rex.imx
sf probe 2:2;sf erase 0x0 0x80000;sf write 0x10800000 0x400 0x7fc00
IMX6 Basic module (Production)
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
tftp 0x177ff400 imx6/u-boot-imx6-rexbasic.imx
go 0x17800000
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6-rexbasic.imx
sf probe 2:2;sf erase 0x0 0x80000;sf write 0x10800000 0x400 0x7fc00
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
tftp 0x177ff400 imx6/u-boot-imx6-rexpro.imx
go 0x17800000
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6-rexpro.imx
sf probe 2:2;sf erase 0x0 0x80000;sf write 0x10800000 0x400 0x7fc00
Version for SD card for usage in combination with iMX6DQ_SPI_to_uSDHC3.bin.
Bootloader can be also stored directly into SD card using host system.
sudo dd if=u-boot-imx6-rexprosd.imx of=/dev/sdb bs=1k seek=1 skip=0 oflag=dsync
#setenv ipaddr 192.168.0.150
#setenv serverip 192.168.0.1
#tftp 0x177ff400 imx6/u-boot-imx6-rexpro.imx
#go 0x17800000
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6-rexprosd.imx
mmc dev 0
setexpr fw_sz ${filesize} / 0x200
setexpr fw_sz ${fw_sz} + 1
mmc write 0x10800000 0x2 ${fw_sz}
IMX6 Ultra module (Production)
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
tftp 0x177ff400 imx6/u-boot-imx6-rexultra.imx
go 0x17800000
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-imx6-rexultra.imx
sf probe 2:2;sf erase 0x0 0x80000;sf write 0x10800000 0x400 0x7fc00
U-Boot v2009.08
cd ~/workdir/imx6/bootloader/
git clone -b uboot-imx-v2009.08 --single-branch https://github.com/voipac/uboot-imx uboot-imx-v2009.08-rex
cd
cd uboot-imx-v2009.08-rex
Compile
IMX6 DualLite module (Prototype)
Linux/Yocto/Android 4.4.x
cd ~/workdir/imx6/bootloader/uboot-imx-v2009.08-rex
make distclean
make mx6dl_rex_config
make -j4
cp -av u-boot.bin /srv/tftp/imx6/u-boot-0x27800000_imx6dl_$(date "+%Y%m%d").bin
Linux/Yocto/Android 4.4.x
cd ~/workdir/imx6/bootloader/uboot-imx-v2009.08-rex
make distclean
make mx6q_rex_config
make -j4
cp -av u-boot.bin /srv/tftp/imx6/u-boot-0x27800000_imx6q_$(date "+%Y%m%d").bin
Output file is called u-boot.bin.
How to Flash new version
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/u-boot-0x27800000_imx6q_20160410.bin
sf probe 3:2;sf erase 0x0 0x80000;sf write 0x10800000 0x0 0x80000
Manually erase configuration
Rex U-Boot > sf probe 2:2
SF: Detected SST25VF032B with page size 256 Bytes, erase size 4 KiB, total 4 MiB
Rex U-Boot > sf erase 0x80000 0x2000
SF: 8192 bytes @ 0x80000 Erased: OK
Rex U-Boot > reset
Android 4.4.2 bootloader + Fedevel kernels
To boot kernels available at http://www.imx6rex.com/application/imx6-development-board/ the machid variable must be modified:
Rex U-Boot > setenv machid f8c
Rex U-Boot > saveenv
Running bootloader from SD card
Rex modules are configured to boot from SPI flash memory by efuses. This setting can be overwritten by running special firmware that must be stored into SPI flash memory.
setenv ipaddr 192.168.0.150
setenv serverip 192.168.0.1
mw.b 0x10800000 0xFF 0x80000
tftp 0x10800000 imx6/iMX6DQ_SPI_to_uSDHC3.bin
sf probe 2:2
sf erase 0x0 0x80000
sf write 0x10800000 0x0 0x80000
Edit boot options
Manually boot from SATA
mw.l 0x020d8040 0x00001020; mw.l 0x020d8044 0x10000000; reset