[PATCH v6 09/25] arm: xenguest_arm64: Add a fake devicetree file

[Tom Rini]

On Thu, Dec 02, 2021 at 12:23:10PM -0700, Simon Glass wrote:
> Hi François,
> 
> On Thu, 2 Dec 2021 at 11:44, François Ozog <francois.ozog at linaro.org> wrote:
> >
> > Hi Simon
> >
> > On Thu, 2 Dec 2021 at 19:29, Simon Glass <sjg at chromium.org> wrote:
> >>
> >> Hi François,
> >>
> >> On Thu, 2 Dec 2021 at 11:17, François Ozog <francois.ozog at linaro.org> wrote:
> >> >
> >> > Hi Simon
> >> >
> >> > On Thu, 2 Dec 2021 at 19:05, Simon Glass <sjg at chromium.org> wrote:
> >> >>
> >> >> Hi Tom,
> >> >>
> >> >> On Thu, 2 Dec 2021 at 10:56, Tom Rini <trini at konsulko.com> wrote:
> >> >> >
> >> >> > On Thu, Dec 02, 2021 at 05:40:46PM +0000, Oleksandr Andrushchenko wrote:
> >> >> > > Hi, Simon!
> >> >> > >
> >> >> > > Sorry for being late to the party
> >> >> > >
> >> >> > > On 02.12.21 17:59, Simon Glass wrote:
> >> >> > > > Add an empty file to prevent build errors when building with
> >> >> > > > CONFIG_OF_SEPARATE enabled.
> >> >> > > >
> >> >> > > > The build instructions in U-Boot do not provide enough detail to build a
> >> >> > > > useful devicetree, unfortunately.
> >> >> > > Xen guest doesn't use any built-in device trees as the guest's device tree is provided
> >> >> > > by the Xen hypervisor itself and is generated at the virtual machine creation time: it is
> >> >> > > populated with memory size, number of CPUs etc. based on [1].
> >> >> > > So, even if we provide some device tree here it must not be used by U-boot at
> >> >> > > the end of the day. Thus, it might be a reasonable solution to provide an empty device
> >> >> > > tree as you do, but put a comment that it is not used.
> >> >> >
> >> >> > So another example of why this series is taking things in the wrong
> >> >> > direction.
> >> >>
> >> >> Why?
> >> >
> >> > I only had that comment in mind: "there is none so deaf as he who will not hear."
> >>
> >> Hey, stop the pile-on. It's not useful.
> >>
> >> I've guided U-Boot's use of devicetree for 10 years successfully. The
> >> current state is a mess and I just to straighten it out.
> >>
> > I admire your talent and knowledge.
> > I know you are 99,99% of the time correct and spot on for your comments in many meetings we were attending.
> > When you questioned a number of points I made, I first tried to understand what I got wrong because you said it.
> > And you were right ;-)
> > For this topic, I made every effort to come to your position, but definitively can't.
> 
> Thank you. I think this will come together in a few years when
> devicetree is sorted out in U-Boot and Binman is more widely used.
> 
> For this series, if and when it is applied, I predict:
> - it will not cause any confusion
> - it will aid development
> - it will help with discoverability, pressuring people to explain how
> to build for their systems
> - it will be a good basis for future work (we have a long list)
> - everyone will wonder what the fuss was about
> 
> Here is the commit that introduced OF_PRIOR_STAGE. It attracted no
> such push-back.
> 
> commit 894c3ad27fa940beb7fdc07d01dcfe81c03d0481
> Author: Thomas Fitzsimmons <fitzsim at fitzsim.org>
> Date:   Fri Jun 8 17:59:45 2018 -0400
> 
>     board: arm: Add support for Broadcom BCM7445
> 
>     Add support for loading U-Boot on the Broadcom 7445 SoC.  This port
>     assumes Broadcom's BOLT bootloader is acting as the second stage
>     bootloader, and U-Boot is acting as the third stage bootloader, loaded
>     as an ELF program by BOLT.
> 
>     Signed-off-by: Thomas Fitzsimmons <fitzsim at fitzsim.org>
>     Cc: Stefan Roese <sr at denx.de>
>     Cc: Tom Rini <trini at konsulko.com>
>     Cc: Florian Fainelli <f.fainelli at gmail.com>

I want to cycle back over here.  Yes, historically a number of things
came in that perhaps shouldn't have.  I went with "well, this is what we
need to handle this case I suppose" and applied it.

-- 
Tom
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