From mboxrd@z Thu Jan  1 00:00:00 1970
From: Martin Husemann <martin@NetBSD.org>
Date: Fri, 8 Mar 2019 18:28:16 +0100
Subject: [U-Boot] [U-Boot,
 v2] Enable expression support for CONFIG_BOARD_SIZE_LIMIT
In-Reply-To: <20190308171709.GG5026@bill-the-cat>
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On Fri, Mar 08, 2019 at 12:17:09PM -0500, Tom Rini wrote:
> OK, so a few thoughts here.
> - What's the portable way to do hex-based math?  If we really need it?

Use printf(3) to convert to/from hex, and standard shell arithmetic
with $(( )).

Looks horrible, but something like:

v=$(( $( printf "%d\n" 0xa0 ) + $( printf "%d\n" 0x10 ) ))
printf "v = %d (%x)\n" $v $v


... maybe arranged into some sh helper functions.

Martin