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From: Peter Maydell <peter.maydell@linaro.org>
Date: Wed, 8 Feb 2017 23:33:43 +0000
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Subject: Re: [Qemu-devel] [PATCH v3 1/1] nios2: Add Altera JTAG UART
 emulation
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To: Marek Vasut <marex@denx.de>
Cc: Juro Bystricky <juro.bystricky@intel.com>, QEMU Developers <qemu-devel@nongnu.org>, jurobystricky@hotmail.com, Chris Wulff <crwulff@gmail.com>

On 8 February 2017 at 23:22, Marek Vasut <marex@denx.de> wrote:
> On 02/09/2017 12:06 AM, Juro Bystricky wrote:
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License
>> + * as published by the Free Software Foundation; either version
>> + * 2 of the License, or (at your option) any later version.
>> + *
>> + * You should have received a copy of the GNU General Public License along
>> + * with this program; if not, see <http://www.gnu.org/licenses/>.
>
> Isn't QEMU GPLv2 only and NOT GPLv2+ ?

As a binary as a whole QEMU is GPLv2, because that is the most
restrictive and thus the controlling license. Individual
source files are under a variety of licenses, which is
fine as long as those licenses are GPL-2-compatible.
We have a preference against 2-only (see the LICENSE file),
and also you should at least use a license we're already
using. GPL2-or-later is fine and a common choice.

> btw for trivial patches like this, cover letter is not necessary .

The rough rule is "single patches don't need a cover letter;
series of more than one patch always do."

thanks
-- PMM