Re: [Buildroot] [PATCH v3 1/6] package/binutils-bare-metal: new package

From: Thomas Petazzoni via buildroot <buildroot@buildroot.org>
To: Luca Ceresoli <luca.ceresoli@bootlin.com>
Cc: "Simek, Michal" <michal.simek@amd.com>,
	"Erkiaga Elorza, Ibai" <ibai.erkiaga-elorza@amd.com>,
	"buildroot@buildroot.org" <buildroot@buildroot.org>,
	"Frager, Neal" <neal.frager@amd.com>
Subject: Re: [Buildroot] [PATCH v3 1/6] package/binutils-bare-metal: new package
Date: Wed, 4 Oct 2023 23:57:56 +0200	[thread overview]
Message-ID: <20231004235756.255601f7@windsurf> (raw)
In-Reply-To: <20231003091539.5e26d558@booty>

Hello Luca,

On Tue, 3 Oct 2023 09:15:39 +0200
Luca Ceresoli <luca.ceresoli@bootlin.com> wrote:

> > > This series instead goes to the other extreme, E.G. we build the
> > > entire microblaze toolchain from scratch and then use it to build
> > > the firmware and use it in the u-boot package - This is nice
> > > because it is all in Buildroot and we have it all under control,
> > > but also brings quite some build time overhead for building the
> > > toolchain before building the    
> > (small) toolchain. You can naturally "solve" it by using two
> > defconfigs, E.G. one that builds the pmufw and another that uses
> > the prebuilt one, but it isn't very handy either.  
> 
> I think the approach taken here by Neal and Ibai is valuable,
> especially as it would allow Buildroot defconfigs to be self-standing.
> Additionally it is already proving useful as it prompted "the
> community" (mostly Neal -- thanks about that) to upstream patches
> needed to support Microblaze in binutils and gcc, that are currently
> downstream.

I agree.

> I fyou are thinking about toolchains.bootlin.com, I am not the
> maintainer of those toolchains but I think the idea is to only have
> Linux toolchains there, not bare metal ones, thus newlib is not
> supported. Also I'm pretty sure downstream feature patches are
> absolutely not welcome there.

Regarding providing a bare-metal toolchain on toolchains.bootlin.com,
we have a chicken-and-egg problem: the toolchains on
toolchains.bootlin.com are built using... Buildroot. So if we want
toolchains.bootlin.com to offer pre-built bare-metal toolchains, we
need Buildroot to be able to generate such bare-metal toolchains in the
first place :-)

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