[U-Boot] Licensing Question on ARM Semihosting Code

[Darwin Rambo <drambo@broadcom.com>]

On 14-02-28 10:49 AM, Tom Rini wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On 02/28/2014 01:18 PM, Darwin Rambo wrote:
>> Given the ARM header below, is this code possible to put into
>> u-boot?
>>
>> For reference, I see this discussion below. 
>> http://lists.denx.de/pipermail/u-boot/2011-November/110884.html
>>
>> If this is not acceptable, presumably due to the "All rights
>> reserved" and "Redistribution in binary form..." clauses below, we
>> could try to find an alternative implementation that is GPL2.0+
>> licensed or rewrite the parts we need from scratch.
>>
>> Any suggestions you have would be most welcome. Thanks.
> 
> So, that particular discussion was about fastboot, and in that
> particular case everything is OK, in the long run (I poked TI's
> lawyers about that).  We're just missing a clean design version being
> ported and I know of a few groups / companies leaning on another
> entity to do so.
> 
> But with your particular quoted header, I think we cannot use it as it
> puts restrictions on the binary redistribution as well.

Thanks Tom. If we were to create a small bit of arm-specific semihosting
code without the licensing restrictions, and it were acceptable to the
maintainers to upstream, would it best live in
u-boot/arch/arm/lib/semihosting.c or in u-boot/lib/semihosting.c? I was
thinking that arch/arm/lib might be the better place for it, especially
since it can support both armv7 and armv8 platforms. The semihosting.h
file might live in arch/arm/include/asm?

BTW the proposal for this is to be able to use the ARM Trusted Firmware
(ATF) to load the various ATF images, plus u-boot, which can then load
the kernel/ramdisk/dtb from a standard arm board file using semihosting,
and then launch the kernel without a bootwrapper. This gives us a more
realistic boot sequence. Thanks!

Regards,
Darwin

> 
> - -- 
> Tom
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.11 (GNU/Linux)
> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
> 
> iQIcBAEBAgAGBQJTENovAAoJENk4IS6UOR1WuUYP/RukZAEnPLM4IEEIMpa9tAir
> J7FUa+zIJKerQfNQ+rrW5/sWGG2Zj/1A8twjcs7W8KXrbbaQEr+jpQRPspS3pa5q
> bmfeBDclNpuwqXtzeQvm6eNWVbkq0+4fJ25AI7fL1EuhpGFmcPfXoAW4DOFBJBUW
> B11BHzHO1PuWl+7fm5PLBT/kMjB8rv8gx6rhyNxp0f3/aN+U4GkSNvVBXo8cBOWm
> 4gO2dqWM299e3x2GYVKBbYwbAydBXXOjwpa3VoGljJPiz5iBT1DrMJV9R37kTRkj
> D07PUlV2aMNdZv+dNxV1FOce/bhcT8iRWyzUSlecPrNWDWp7nFaIaGBpDHh8iRKA
> thB7LlT1hQI88ksQH923CBaa2N1N/HgYtXYSiwRXx8bQexLIBieCvfUsHxqtWKRQ
> r+bf3febP0MYiU5BCHKHHpY3zfERGRIVmgAs/7khtm038ORAIxWLX7myvQyubfBz
> jRbwkZfpR1UXQ8g6zcbRah9mB12foVURF8a67v+9JC7p4/Jrrjb3ARgw8LwA61de
> kiqjUr3qDfEcow9KTxZPVFi5gLJXTSdMPzgrs/2cCJ2jFnN/olGd//eGaIZUzf6P
> 7L2oOEwv2i7p4FwwciTGhQWCfLO3YzU0MHnFJsHu+NaDdUxhpf/X/zwcAHvQqrc+
> L6bmYpnta9ViVwJHzOSS
> =Si6y
> -----END PGP SIGNATURE-----
>