This note explains how to upgrade the i.MX 6SoloX SOM running an earlier release to Release 2.3.2 and newer. The procedure below assumes that you have configured networking in U-Boot and placed the release 2.3.2 images to the TFTP directory on your host.

Perform the following step-wise procedure to migrate:

• Reboot and stop at the U-Boot prompt:

U-Boot 2015.04-imx6sx-2.3.1 (Feb 28 2017 - 19:16:36)netw

CPU:    Freescale i.MX6SX rev1.2 at 792 MHz
CPU:    Temperature 50 C
Reset cause: WDOG
Board: Emcraft SLX-SOM rev 2A
I2C:     ready
DRAM:    512 MiB
NAND:    512 MiB
MMC:     FSL_SDHC: 0
Display: LCD-TN43 (480x272)
Video: 480x272x24
gis input --- No input
In:      serial
Out:     serial
Err:     serial
Net:     FEC [PRIME]
Normal Boot
Hit any key to stop autoboot: 0
SLX-SOM U-Boot >

• Print the current U-Boot environment:

SLX-SOM U-Boot > print
addip=setenv bootargs ${bootargs} 0
ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}:eth0:off fec_mac=${ethaddr} args=run args_quiet0
args_common=console=ttymxc0,1152000
args_nfs=setenv bootargs ${args_common} ignore_loglevel root=/dev/nfs0
nfsroot=${serverip}:/mnt/nfs/slx-som/rootfs,v3,nolock0
args_quiet=setenv bootargs ${args_common} ${ubirfs} quiet=quiet0
args_verbose=setenv bootargs ${args_common} ${ubirfs} ignore_loglevel0
autoload=yes0
baudrate=1152000
boot_dtb=nand read ${dtb_addr} ${dtb_offset} 0x20000 && bootm ${loadaddr} - ${dtb_addr}0
bootargs=console=ttymxc0,115200 rootwait=1 rw ubi.mtd=4,2048 rootfstype=ubifs root=ubi0:rootfs ubi.fm_autoconvert=1 quiet=quiet ip=172.17.80.3:172.17.0.1::::eth0:off fec_mac=3C:FB:96:77:88:AB bootcmd=run reliableboot0
bootdelay=10
dtb_addr=0x830000000
dtb_offset=0xe000000
dtbimage=slx-som/rootfs.dtb0
dtbupdate=tftp ${dtbimage} && nand erase.spread ${dtb_offset} ${filesize} && nand write ${loadaddr} ${dtb_offset} ${filesize}0
ethact=FEC0
ethaddr=3C:FB:96:77:88:AB0
ethprime=FEC0
fileaddr=807fffc00
filesize=51e5a00
flashsize=51e5a00
image=psl/slx/imx6sx-2.3.1/rootfs.uImage0
ipaddr=172.17.80.30
loadaddr=0x807fffc00
nandboot=nand read ${loadaddr} ${uImage_offset} ${flashsize} && run args addip && run boot_dtb0
netboot=tftp ${image} && run args addip && run boot_dtb0
panel=LCD-TN430
reliableboot=run nandboot0
rootfs_offset=0x1a200000
rootfsimage=rootfs.ubi0
rootfsupdate=tftp ${rootfsimage} && nand erase.spread ${rootfs_offset} 0xa000000 && nand write ${loadaddr} ${rootfs_offset} ${filesize}0
serverip=172.17.0.10
splash_offset=0x4000000
splashfile=slx-som/boot_screen.bmp0
splashimage=0x80007fc00
splashpos=m,m0
splashupdate=tftp ${splashfile} && nand erase.spread ${splash_offset} ${filesize} && nand write ${loadaddr} ${splash_offset} ${filesize}0
uImage_offset=0xe200000
ubirfs=rootwait=1 rw ubi.mtd=4,2048 rootfstype=ubifs root=ubi0:rootfs ubi.fm_autoconvert=10
update=tftp ${image} && nand erase.spread ${uImage_offset} ${filesize} && nand write ${loadaddr} ${uImage_offset} ${filesize} && setenv flashsize ${filesize} && saveenv
verify=no

Environment size: 2164/65531 bytes
SLX-SOM U-Boot >

• Update the rootfs image:

SLX-SOM U-Boot > setenv rootfsimage psl/slx/imx6sx-2.3.2/rootfs.ubi
SLX-SOM U-Boot > save
Saving Environment to NAND...
Erasing NAND...
Erasing at 0x220000 -- 100% complete.
Writing to NAND... OK
SLX-SOM U-Boot > run rootfsupdate
Using FEC device
TFTP from server 172.17.0.1; our IP address is 172.17.80.3
Filename 'psl/slx/imx6sx-2.3.2/rootfs.ubi'.
Load address: 0x807fffc0
Loading:#########################################################
#################################################################
#################################################################
#################################################################
...


• Update the kernel image:

SLX-SOM U-Boot > setenv image psl/slx/imx6sx-2.3.2/rootfs.uImage
SLX-SOM U-Boot > save
Saving Environment to NAND...
Erasing NAND...
Erasing at 0x220000 -- 100% complete.
Writing to NAND... OK
SLX-SOM U-Boot >
SLX-SOM U-Boot > run update
Using FEC device
TFTP from server 172.17.0.1; our IP address is 172.17.80.3
Filename 'psl/slx/imx6sx-2.3.2/rootfs.uImage'.
Load address: 0x807fffc0
Loading:#########################################################
#################################################################
#################################################################
#################################################################
#################################################################
#########################################
7.1 MiB/s
done
Bytes transferred = 5367472 (51e6b0 hex)

NAND erase.spread: device 0 offset 0xe20000, size 0x51e6b0
Erasing at 0x1320000 -- 100% complete.
OK

NAND write: device 0 offset 0xe20000, size 0x51e6b0
5367472 bytes written: OK
Saving Environment to NAND...
Erasing redundant NAND...
Erasing at 0x240000 -- 100% complete.
Writing to redundant NAND... OK
SLX-SOM U-Boot >

• Update the DTB image:

SLX-SOM U-Boot > setenv dtbimage psl/slx/imx6sx-2.3.2/rootfs.dtb
SLX-SOM U-Boot > save
Saving Environment to NAND...
Erasing NAND...
Erasing at 0x220000 -- 100% complete.
Writing to NAND... OK
SLX-SOM U-Boot >
SLX-SOM U-Boot >
SLX-SOM U-Boot > run dtbupdate
Using FEC device
TFTP from server 172.17.0.1; our IP address is 172.17.80.3
Filename 'psl/slx/imx6sx-2.3.2/rootfs.dtb'.
Load address: 0x807fffc0
Loading: ###
437.5 KiB/s
done
Bytes transferred = 37651 (9313 hex)

NAND erase.spread: device 0 offset 0xe00000, size 0x9313
Erasing at 0xe00000 -- 100% complete.
OK

NAND write: device 0 offset 0xe00000, size 0x9313
37651 bytes written: OK
SLX-SOM U-Boot >

• Boot to the shell prompt:

SLX-SOM U-Boot > re
resetting ...

U-Boot 2015.04-imx6sx-2.3.1 (Feb 28 2017 - 19:16:36)

CPU: Freescale i.MX6SX rev1.2 at 792 MHz
CPU: Temperature 55 C
Reset cause: WDOG
Board: Emcraft SLX-SOM rev 2A
I2C: ready
...
fec 21b4000.ethernet (unnamed net_device) (uninitialized): Invalid MAC address: 00:00:00:00:00:00 fsl-asoc-card sound: ASoC: CPU DAI (null) not registered
init started: BusyBox v1.17.0 (2017-04-18 17:41:00 +0400)
~ #
~ #
~ # main: GUI started
~ #

• Update the U-Boot image and reboot:

~ # kobs-ng -x -v /u-boot.imx
MTD CONFIG:
chip_0_device_path = "/dev/mtd0"
chip_1_device_path = "(null)"
search_exponent = 2
data_setup_time = 80
data_hold_time = 60
address_setup_time = 25
data_sample_time = 6
...
mtd: We write one page for save guard. *
~ # reboot
The system is going down NOW!
Sent SIGTERM to all processes
TERM
Requesting system rebootesses
reboot: Restarting system


U-Boot 2015.04-imx6sx-2.3.2 (Apr 18 2017 - 17:33:59)

CPU:Freescale i.MX6SX rev1.2 at 792 MHz
CPU:Temperature 51 C
Reset cause: WDOG
...


• Stop at the U-Boot prompt:

U-Boot 2015.04-imx6sx-2.3.2 (Apr 18 2017 - 17:33:59)
CPU:   Freescale i.MX6SX rev1.2 at 792 MHz
CPU:   Temperature 55 C
Reset cause: WDOG
Board: Emcraft SLX-SOM rev 2A
I2C:   ready
DRAM:  512 MiB
NAND:  512 MiB
MMC:   FSL_SDHC: 0
Display: LCD-TN43 (480x272)
Video: 480x272x24
gis input --- No input
In:    serial
Out:   serial
Err:   serial
Net:   FEC [PRIME]
Normal Boot
Hit any key to stop autoboot:  0
SLX-SOM U-Boot >

• Reset the U-Boot environment to default:

SLX-SOM U-Boot > env default -f -a
## Resetting to default environment
SLX-SOM U-Boot > save
Saving Environment to NAND...
Erasing NAND...
Erasing at 0x220000 -- 100% complete.
Writing to NAND... OK
SLX-SOM U-Boot >

• Restore the networking parameters saved at step 1:

SLX-SOM U-Boot > setenv ethaddr 3C:FB:96:77:88:AB
SLX-SOM U-Boot > setenv ipaddr 172.17.80.3
SLX-SOM U-Boot > setenv serverip 172.17.0.1
SLX-SOM U-Boot > save
Saving Environment to NAND...
Erasing redundant NAND...
Erasing at 0x260000 -- 100% complete.
Writing to redundant NAND... OK
SLX-SOM U-Boot >

• Optionally, restore other custom macros and variables saved on step 1.
• Reset and boot to the new Linux image:

SLX-SOM U-Boot > reset

resetting ...

U-Boot 2015.04-imx6sx-2.3.2 (Apr 18 2017 - 17:33:59)

CPU:   Freescale i.MX6SX rev1.2 at 792 MHz
CPU:   Temperature 55 C
Reset cause: WDOG
Board: Emcraft SLX-SOM rev 2A
I2C:   ready
DRAM:  512 MiB
NAND:  512 MiB
MMC:   FSL_SDHC: 0
Display: LCD-TN43 (480x272)
Video: 480x272x24
gis input --- No input
In:    serial
Out:   serial
Err:   serial
Net:   FEC [PRIME]
Normal Boot
Hit any key to stop autoboot:  0 


Loading from nand0, offset 0xe20000
Image Name:   Linux-4.5.0-imx6sx-2.3.2
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    5367408 Bytes = 5.1 MiB
Load Address: 80008000
Entry Point:  80008000

NAND read: device 0 offset 0xe00000, size 0x20000
131072 bytes read: OK
## Booting kernel from Legacy Image at 807fffc0 ...
Image Name:   Linux-4.5.0-imx6sx-2.3.2
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    5367408 Bytes = 5.1 MiB
Load Address: 80008000
Entry Point:  80008000
Verifying Checksum ... OK
## Flattened Device Tree blob at 83000000
Booting using the fdt blob at 0x83000000
Loading Kernel Image ... OK
Loading Device Tree to 9df30000, end 9df3c312 ... OK

Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Booting Linux on physical CPU 0x0
Linux version 4.5.0-imx6sx-2.3.2 ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it ) (gcc version 4.9.3 (GCC) ) #1 SMP PREEMPT Tue Apr 18 17:40:24 +0400 2017
CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c5387d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine model: Emcraft SLX-SOM board
debug: ignoring loglevel setting.
Memory policy: Data cache writealloc
>On node 0 totalpages: 131072
free_area_init_node: node 0, pgdat 8094e8c0, node_mem_map 9fbf8000
...