[U-Boot] VAR-SOM-MX6 - Boot Count Limit support?

[brendan]

Hello,

I have a VAR-SOM-MX6 with the following details:

Board: Variscite VAR_SOM_MX6 SOM-Solo
SOC_FAMILY = "mx6:mx6q:mx6dl"
PREFERRED_PROVIDER_virtual/kernel_var-som-mx6 ?= "linux-variscite"
PREFERRED_VERSION_linux-imx_mx6 = "4.1.15"

and the following u-boot details:

U-Boot SPL 2013.10-00027-g58782ac (Mar 09 2015 - 13:33:44)
i.MX6SOLO SOC DDR EEPROM configuration
Part number: VSM-SOLO-102
Assembly: AS151004858
Date: 2016 Feb 08
Ram size 1024
Boot Device: NAND
NAND: 512 MiB


U-Boot 2013.10-00027-g58782ac (Mar 09 2015 - 13:33:44)

CPU:   Freescale i.MX6SOLO rev1.2 at 792 MHz
CPU:   Temperature 51 C, calibration data: 0x5744e269
Reset cause: POR
Board: Variscite VAR_SOM_MX6 SOM-Solo
I2C:   ready
DRAM:  1 GiB
NAND:  512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
In:    serial
Out:   serial
Err:   serial
Board: Variscite VAR_SOM_MX6 SOM-Solo
Net:   using phy at 7


I am using Yocto to create my images (.swu) to update my board through 
swupdate <https://sbabic.github.io/swupdate/swupdate.html>  .  The update
process and loading process via NFS and NAND causes no issues. 

I am trying to implement a system whereby if the board fails to boot, it
should boot to a recovery configuration where the user is presented with the
swupdate landing page to allow for an image (.swu) upload to update or boot
to a recovery .img (uImage, .dtb, rootfs stored on MMC or NAND). 

I have read about uboot's  Boot Count Limit
<http://www.denx.de/wiki/view/DULG/UBootBootCountLimit>   which is along the
lines of what I would like to implement i.e. after x failed boot attempts
use an alternate boot action.  However this functionality is not supported
by my board.  

I am new to this and was wondering if anyone could shed any light on what I
need to look at or how I can somehow implement the Boot Count Limit
functionality or similar.  

Thanks for your help.






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