From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pierre-Jean Texier <pjtexier@koncepto.io>
Date: Mon, 7 Oct 2019 20:44:44 +0200
Subject: [U-Boot] [u-boot-imx/next] WaRP7 & Pico-Pi i.MX7 NOK
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Stefano, Peng,

I just compiled a fresh U-Boot with u-boot-imx/next and It looks
like commit 34f2feb ("imx: mmc_env: update runtime SD/MMC boot env 
device") [1]
breaks my WaRP7 (but the same for the Pico-Pi i.MX7, tested by Joris in 
CC),
see logs after:

U-Boot 2019.10-rc4-00232-gd03193d (Oct 07 2019 - 18:44:25 +0200)

CPU:   Freescale i.MX7S rev1.2 800 MHz (running at 792 MHz)
CPU:   Extended Commercial temperature grade (-20C to 105C) at 33C
Reset cause: POR
Model: Warp i.MX7 Board
Board: WARP7 in secure mode OPTEE DRAM 0x9d000000-0xa0000000
DRAM:  464 MiB
MMC:   FSL_SDHC: 1, FSL_SDHC: 0
Loading Environment from MMC... MMC Device 2 not found
*** Warning - No MMC card found, using default environment
...
=> env default -f -a
## Resetting to default environment
=> env save
Saving Environment to MMC... MMC Device 2 not found
No MMC card found
Failed (1)

FYI, with a git revert -s 34f2feb92db6146831bafa696b7b46785c9f6b10,
all is working fine:

=> env default -f -a
## Resetting to default environment
=> env save
Saving Environment to MMC... Writing to MMC(0)... OK

So, can you consider this commit 'not applicable' for 2019.10 ?

BR

[1] - 
https://github.com/sbabic/u-boot-imx/commit/34f2feb92db6146831bafa696b7b46785c9f6b10
-- 
Pierre-Jean Texier
Embedded Linux Engineer
https://koncepto.io