Hi Adam,
Thanks a lot for replying.
I spent some time trying to make the imx6q_logic board boot from SPL from NAND, but I needed to patch a few things. Some of them have yet to be approved, but if they work for you, maybe it will help get them approved.
There was a broken function pointer here that was fixed and applied the imx-master, but pending merge with master http://patchwork.ozlabs.org/patch/1019440/
Configure ECC from SPL here: http://patchwork.ozlabs.org/patch/1020160/
Remove hard-coded ECC parameters since the patch above can autoset them. http://patchwork.ozlabs.org/patch/1026638/
With those 3 patches and some minor changes to my individual board file and config file, I was able to boot 2019.01 via SPL from NAND. Since it was working for you before, I am guessing the board file stuff and config file stuff is probably already for you.
I did apply the above mentioned 3 patches but nand boot is still not working.
Here are debug enabled boot logs https://paste.ubuntu.com/p/dmcwqzv6Sk/
Best Regards, Shyam