linux-kernel - Re: [PATCH] ARM: bcm2835_defconfig: add minimal support for Raspberry Pi4

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Message-ID: <5adcb2de-3570-9c4d-5e5b-726b94fb2029@samsung.com>
Date:   Thu, 13 Feb 2020 08:35:06 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Stefan Wahren <stefan.wahren@...e.com>
Subject: Re: [PATCH] ARM: bcm2835_defconfig: add minimal support for
 Raspberry Pi4

Hi Nicolas

On 12.02.2020 19:31, Nicolas Saenz Julienne wrote:
> Hi Marek,
> On Wed, 2020-02-12 at 11:20 +0100, Marek Szyprowski wrote:
>> Add drivers for the minimal set of devices needed to boot Raspberry Pi4
>> board.
>>
>> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Just so you know, the amount of support on the RPi4 you might be able to get
> updating bcm2835_defconfig's config is very limited. Only 1GB of ram and no
> PCIe (so no USBs).

Yes, I know. A lots of core features is missing: SMP, HIGHMEM, LPAE, PCI 
and so on, but having a possibility to boot RPi4 with this defconfig 
increases the test coverage.

> FYI I've been working on getting a workable configuration for arm32, short of
> creating a new config altogether:
> https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg163770.html
>
> That said, if you insist on booting with bcm2835_defconfig, I have no problem
> with the patch.

Right, having a proper multi defconfig with LPAE is also needed on other 
boards. I would add VIRTUALIZATION and KVM to it too.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland