From owner-freebsd-arm@freebsd.org  Wed Jul  4 09:45:49 2018
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Date: Wed, 4 Jul 2018 11:45:39 +0200
From: "Herbert J. Skuhra" <herbert@gojira.at>
To: freebsd-arm@freebsd.org
Subject: Re: gpart trouble
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On Tue, Jul 03, 2018 at 09:16:39PM -0700, bob prohaska wrote:
> 
> I want to add some swap partitions to the June 28th RPI3 snapshot image on microSD. 
> Growfs was suppressed, so the card has 12 GB of free space:
> 
> Enter full pathname of shell or RETURN for /bin/sh: 
> Cannot read termcap database;
> using dumb terminal settings.
> # mount -o rw /
> # gpart show mmcsd0
> =>      63  31116225  mmcsd0  MBR  (15G)
>         63      2016          - free -  (1.0M)
>       2079    102312       1  fat32lba  [active]  (50M)
>     104391   5138469       2  freebsd  (2.5G)
>    5242860  25873428          - free -  (12G)
> 
> # gpart add -t freebsd-swap -s 1G mmcsd0
> gpart: Invalid argument
> # gpart add -t freebsd-swap -s 1G /dev/mmcsd0
> gpart: Invalid argument
> # gpart add -t freebsd-swap -s 1GB -l swap mmcsd0
> gpart: Invalid argument

Try:

# gpart show mmcsd0s2
# gpart resize -i 2 mmcsd0
# gpart add -t freebsd-swap -s 1GB mmcsd0s2

-- 
Herbert