From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ijc+uboot@hellion.org.uk>
Date: Sat, 12 Sep 2015 12:58:07 +0100
Subject: [U-Boot] [RFC PATCH 1/2] sunxi: retrieve FEL-provided values to
 environment variables
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 <1441289520-22749-2-git-send-email-bernhard.nortmann@web.de>
 <55F1CD2C.9080803@redhat.com>
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On Thu, 2015-09-10 at 20:34 +0200, Hans de Goede wrote:
> [...]
> 
> What if the user interrupts auto-boot with a fel provided boot.scr
> and then does "saveenv" ?

This is an interesting question which is more generic than just these
variable, i.e. it applies to some extent to "ipaddr" when someone does
"dhcp ; saveenv" too.

Grepping around to see if there was any special handling for ipaddr I
came across "Vendor Parameter Protection" in the top-level README as
well as "CONFIG_ENV_FLAGS_LIST_DEFAULT" (and _STATIC) and various
default settings in include/env_flags.h.

I think CONFIG_ENV_FLAGS_LIST_* are what we want, and we want fel* to
be flagged "r" for read only and perhaps given an appropriate type
(either "d" or "x" for decimal or hex respectively, I suppose).

Ian.