From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthias Brugger <mbrugger@suse.com>
Date: Fri, 8 Nov 2019 17:44:58 +0100
Subject: [U-Boot] Issues when saving environment in RK399 RockPI 4
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Hi Ezequiel,

On 07/11/2019 20:27, Fabio Estevam wrote:
> Hi Ezequiel,
> 
> On Thu, Nov 7, 2019 at 3:45 PM Ezequiel Garcia
> <ezequiel@vanguardiasur.com.ar> wrote:
>>
>> I decided to test latest U-Boot, following instructions in
>> doc/README.rockchip. The instructions seemed
>> clear and I could build this easily.
>>
>> However, there seems to be an issue when I save the environment. Any ideas?
>>
>> => saveenv
>> Saving Environment to MMC... Writing to MMC(0)... OK
>> => reset
>> resetting ...
>> U-Boot TPL 2020.01-rc1-00213-g0f282c1876af-dirty (Nov 07 2019 - 15:21:44)
>> Trying to boot from BOOTROM
>> Returning to boot ROM...
>>
>> U-Boot SPL 2020.01-rc1-00213-g0f282c1876af-dirty (Nov 07 2019 - 15:21:44 -0300)
>> Trying to boot from MMC2
>>
>>
>> U-Boot 2020.01-rc1-00213-g0f282c1876af-dirty (Nov 07 2019 - 15:21:44 -0300)
>>
>> Model: Radxa ROCK Pi 4
>> DRAM:  2 GiB
>> Cannot find regulator pwm init_voltage
>> MMC:   dwmmc at fe320000: 1, sdhci at fe330000: 0
>> Loading Environment from MMC... OK
>> In:    serial at ff1a0000
>> Out:   serial at ff1a0000
>> Err:   serial at ff1a0000
>> Model: Radxa ROCK Pi 4
>> ## Error: Can't overwrite "serial#"
>> ## Error inserting "serial#" variable, errno=1
>> initcall sequence 000000007ffc10b8 failed at call 0000000000202a20 (err=-1)
>> ### ERROR ### Please RESET the board ###
> 
> I have observed issues like this with i.MX when U-Boot size grew and
> overlapped the environment variable region.
> 
> Here is one commit that fixed the issue for mx53loco board:
> https://gitlab.denx.de/u-boot/u-boot/commit/033f6ea5fa5fce63d52c8c2b63d8284144415b88
> 
> Try to investigate if this could be cause of the issue you are seeing.
> 

You could also try the first two patches from this series:
https://patchwork.ozlabs.org/user/todo/uboot/?series=132338

Maybe you are hit by the over-writing discontiguous files bug in the FAT code.

Regards,
Matthias