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From: John Baldwin <jhb@freebsd.org>
To: Ngie Cooper <ngie@freebsd.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r316132 - head/sys/boot/i386/boot2
Date: Wed, 29 Mar 2017 14:27:59 -0700
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On Wednesday, March 29, 2017 09:30:03 AM Ngie Cooper wrote:
> Author: ngie
> Date: Wed Mar 29 09:30:03 2017
> New Revision: 316132
> URL: https://svnweb.freebsd.org/changeset/base/316132
> 
> Log:
>   Parameterize out 7680 (15 * 512) as BOOT2SIZE, similar to sys/boot/i386/zfsboot/...
>   
>   This is being done to make it easier to change in the future--this action might be
>   needed sooner rather than later because of gcc 6.3.0 bailing, stating that there
>   is negative free space left (deficit) in the boot2 bootloader.
>   
>   MFC after:	2 months
>   Sponsored by:	Dell EMC Isilon

This can't be changed.  It's baked into the BSD disklabel format.

-- 
John Baldwin