[U-Boot] SPDX-License-Identifier: adding a comment section?

[Tom Rini <trini@ti.com>]

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On 07/28/2013 11:40 AM, Wolfgang Denk wrote:
> Hello all,
> 
> I need some help / recommendations how we should handle
> non-trivial license issues.  For example, please have a look at the
> NE2000 network driver code:
> 
> drivers/net/ne2000.h drivers/net/ne2000.c 
> drivers/net/ne2000_base.h drivers/net/ne2000_base.c
> 
> - First, these files include a statement that this code has been 
> derived from Linux kernel and from eCOS sources and that it's 
> released unter "GPL", but without stating wehter this means GPL-v2 
> or GPL-v2+ or whatever.
> 
> - Second, it includes the eCOS license header which basically says 
> it's GPLv2+ plus some additional rights.
> 
> - Third, if you track down the Linux source code mentioned above, 
> this again says only "GPL" without additional specification.
> 
> 
> Two questions arise:
> 
> - What should the resulting license(s) be in this specific case? I
> tend to interpret plain "GPL" as "GPLv2+", so we could probably 
> summarize the license terms here as "eCos-2.0".
> 
> What do you think?

I grabbed (because of the omap watchdog patch) 2.4.17, and that's (a)
older than our ne2k driver and (b) Already a GPLv2 and not 'or later'.
 This is, I think, GPL-2.0.

> - I feel it would be helpful for future investigations if we are
> able to document our current understanding, so we don't have to 
> re-investigate all this again and again each time we run into
> these files.  My proposal is to define an additional "magic
> string"
> 
> SPDX-License-Comments:
> 
> which could be used to mark a text section that would contain such 
> explanations.
> 
> Wound this make sense, or do you have a better suggestion?

Sounds good.  In this case we would say something like "Linux Kernel
driver and eCos driver files both used as reference".

- -- 
Tom
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