[U-Boot] i.MX6Q SPL won't boot U-Boot from NAND

[Adam Ford]

I am trying to boot an i.MX6Q via SPL to U-Boot and eventually, use
Falcon mode to start the kernel.  I can boot via SPL over USB.  I have
enabled the NAND and SPL NAND, and i can confirm that mxs_nand_spl.c
is being built in.  The board is imx6q_logic

Unfortunately, I have run into two issues.

1.  Imxs_nand_init from mxs_nand_spl.c is trying to run
nand_chip.scan_bbt(mtd), but nand_chip.scan_bbt hasn't been defined
from what i can tell.

There is a function called nand_default_bb which looks like it should
be setup as the default for this, but I am not sure.  As-is, the
system crashes when it attempts to run because it's a broken/NULL
function pointer.  Is there something that should initialize this
pointer and/or what should it reference?

2.  With the #1 commented out,  I get some error messages, but I am
mostly concerned about the BCH read timeout.  I am asking if there is
something missing.

#define CONFIG_SYS_NAND_U_BOOT_OFFS    0x200000


U-Boot SPL 2018.07-00031-g771af54de4-dirty (Jul 24 2018 - 14:18:14 -0500)
>>spl:board_init_r()
spl_early_init()
Trying to boot from NAND
spl: nand - using hw ecc
0x01:0xd3 erasesize=131072 (>>17)
writesize=2048 (>>11)
oobsize=64
chipsize=1073741824
nand_spl_load_image offset:0x00200000 len:64 page:1024
MXS NAND: BCH read timeout
mkimage signature not found - ih_magic = d4aa74ca
nand_spl_load_image offset:0x00200000 len:204800 page:1024
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
is_badblock offs=0x00220000 block:17 page:1088
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
MXS NAND: BCH read timeout
Jumping to U-Boot
loaded - jumping to U-Boot...
image entry point: 0x17800000