[U-Boot] IMX6 NAND boot regression

[Jagan Teki]

+Adam, Shyam

On Sat, 2 Feb, 2019, 8:49 AM Stefan Agner <stefan.agner at toradex.com wrote:

> Hi Tim,
>
> On 02.02.19 03:32, Tim Harvey wrote:
> > 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 am sorry about that. Unfortunately I did not had a design at hand where
> I was able to test the NAND driver in SPL...
>
> >
> > 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?
>

Look like 2017.03 can be stable boot from nand as for as my test is concern.

We are also trying hard using git bisect, but seems like multiple breakings.

Will keep posted if something move further.