From mboxrd@z Thu Jan  1 00:00:00 1970
From: Fabio Estevam <festevam@gmail.com>
Date: Fri, 17 May 2019 09:39:31 -0300
Subject: [U-Boot] Cannot boot mx6qsabred with 2019.07-rc2
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On Thu, May 16, 2019 at 11:29 PM Peng Fan <peng.fan@nxp.com> wrote:

> You could enable DEBUG in SPL, and disable SPL_SDP because of size will exceeds.
> Then see what happends.

Even without DEBUG enabled we get useful error messages:

U-Boot SPL 2019.07-rc2 (May 17 2019 - 09:30:33 -0300)
Trying to boot from MMC1
spl: could not find mmc device 0. error: -19
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

This means that
err = uclass_get_device(UCLASS_MMC, mmc_dev, &dev); fails inside
common/spl/spl_mmc.c

Why does this happen?

About the size difference:

Original defconfig generates an SPL of 76800 bytes
With CONFIG_SPL_DM=y removed the SPL size goes to 68608 bytes.

> I have no idea, then. My board is REV C4, chip 1.5

Mine is rev C2 with i.MX6Q rev1.2