Re: [Buildroot] [PATCH v2 1/2] package/zynqmp-firmware: new package

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

On Fri, 7 Apr 2023 17:16:48 +0200
Luca Ceresoli via buildroot <buildroot@buildroot.org> wrote:

> These two patches look good, and I appreciate a lot your effort, however
> I'm not sure it's a good idea to support both an external and a
> generated toolchain. It makes things more complicated on the Buildroot
> side and I'm not aware of any actual benefits.
> 
> Moreover if we take these patches now we would to some extent encourage
> users to use an external Microblaze toolchain, possibly reducing usage
> of the generated one for initial users. And I guess we would stick to
> the external toolchain as a default for the future because it's what
> was there initially.
> 
> So I would prefer waiting until we have a working
> Buildroot-generated toolchain and initially support only that. Support
> for an external toolchain can be added easily later, in case the
> generated one were not suitable for good reasons.
> 
> Do you have any updates on your work to generate a minimal Microblaze
> toolchain within Buildroot? Should you be facing any issues, remember
> the Buildroot community can be very helpful!

I agree with Luca, but I would relax a bit the requirement and say I
would be fine with a pre-built external toolchain to be packaged, like
package/arm-gnu-toolchain/ does for a pre-built ARM32 bare-metal
toolchain.

I looked a bit for such a pre-built Microblaze toolchain, but all what
Xilinx provides is hidden inside multi-GB archives with zillions of
things, and these archives are themselves accessible with a proper
login on the Xilinx site.

So either Xilinx puts online a bare-metal toolchain that we can package
like package/arm-gnu-toolchain/, or we look at adding support for
building a bare-metal toolchain in Buildroot.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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