From mboxrd@z Thu Jan  1 00:00:00 1970
From: Fabio Estevam <festevam@gmail.com>
Date: Sat, 4 Jun 2016 17:38:29 -0300
Subject: [U-Boot] Between 2015.10 and 2016.01,
 SPI flash changed erase size, and saveenv stopped working
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 <20160530083315.GA18126@amd>
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 <20160602134158.GA19969@amd>
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On Thu, Jun 2, 2016 at 10:41 AM, Pavel Machek <pavel@denx.de> wrote:

>> Does this quick hack help? I am wondering if yous SPI flash power up
>> with the SR field protected:
>
> This may be stupid but... is it possible that changes made by
> write_sr() persist over powerdown?

Yes, they do.