[U-Boot] IMX6 NAND boot regression

[Tim Harvey]

Stefan,

I'm trying to track down an IMX6 SPL NAND boot regression that started
in v2018.07 with your patch series to mxs_nand.

I bisected it back to '5346c31e305a37d39f535cc0d5ae87d8b7e81230 mtd:
nand: mxs_nand: use self init'. With this particular patch nand bbt
scanning would crash the board because of nand_chip.scan_btt not being
assigned. This was later fixed in
'96d0be07e7498e7174daa6f3b56fc807b9feb71d MTD: nand: mxs_nand_spl: Fix
empty function pointer for BBT' but cherry-picking that on top of
5346c31 fixes the immediate crash while scanning but then I find that
mxs_read_page_ecc() hangs on the 4th page of reading u-boot.img from
the NAND. This gets worse 2 patches later where in
'28897e8d21f8e197e259a91c693de09cd81f2d5a: mtd: nand: mxs_nand: use
structure for BCH geometry' I find that the first byte of every page
read is wrong because mxs_nand_swap_block_mark() is getting called on
the page which swaps the first bytes with oob.

There are several IMX6 boards out there using both NAND and SPL I
believe that I would assume were broken by this series. Any ideas on
the proper resolution?

Regards,

Tim