linux-kernel - Re: [PATCH 0/3] add Ebang EBAZ4205 support

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Message-ID: <df072e37bb6f3500d713be565cfa1328@walle.cc>
Date:   Thu, 21 Jan 2021 11:41:26 +0100
From:   Michael Walle <michael@...le.cc>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org
Subject: Re: [PATCH 0/3] add Ebang EBAZ4205 support

Hi,

Am 2021-01-21 11:23, schrieb Michal Simek:
>>> Back to your case. Board is cheap which is not all the time case for 
>>> any
>>> xilinx board but you have only uart, sd and partially described 
>>> ethernet
>>> which doesn't work without PL. Is it worth to have this described?
>> 
>> I got your point. But it is at least a jump start for the users if 
>> that
>> board boots out of the box. And yes, its unfortunate, that ethernet
>> just works if the PL is configured. This is already done by the
>> bootloader, because there I do have the same problem.
> 
> Zynq/ZynqMP boards can use U-Boot SPL. "Advantage" of this solution
> especially for Zynq is that in u-boot there is open a way for adding
> ps7_init file which is determined by device tree name.
> I think it would make sense to add these DTs and also ps7_init to 
> U-Boot
> project and wire it up with zynq_virt platform and then you can boot
> Linux with using U-Boot's DT pointed by $fdtcontroladdr.
> Then you will get support from scratch to be able to boot.

I already have patches for u-boot (using SPL). But my impression was
that linux is the master for the device trees. Esp. if there are some
problems with the board its often useful to have an in-tree device
tree.

What is the difference between this board and the other zynq boards
in the kernel?

In any case, please make this decision now: will you accept this
device tree or not?

-michael