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Subject: Re: Regression with e428e250fde6 on BeagleBoard Rev C2
To:     Tony Lindgren <tony@atomide.com>
Cc:     linux-omap@vger.kernel.org,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        "H. Nikolaus Schaller" <hns@goldelico.com>,
        Andreas Kemnade <andreas@kemnade.info>
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From:   Jarkko Nikula <jarkko.nikula@bitmer.com>
Message-ID: <18a27933-e412-c1ed-a744-62cfbcd6a81b@bitmer.com>
Date:   Sat, 25 Sep 2021 17:55:22 +0300
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On 9/24/21 10:02 AM, Tony Lindgren wrote:
> * Jarkko Nikula <jarkko.nikula@bitmer.com> [210923 18:04]:
>> On 9/23/21 8:41 AM, Tony Lindgren wrote:
>>> * Jarkko Nikula <jarkko.nikula@bitmer.com> [210922 17:22]:
>>>> Better luck with this one but looks like idling cause "undefined
>>>> instruction" crash. Cache/memory etc corruption perhaps? Serial console
>>>> log attached.
>>>
>>> Hmm. If you comment out the twl power node, does the omap3-beagle-ab4.dtb
>>> boot normally for you? It should behave the same as current mainline then
>>> with the omap3isp issue.
>>>
>> Commenting the twl_power node out or removing the twl section leads to
>> immediately rebooting kernel:
> 
> Below is an updated patch to move the timer quirks to omap3-beagle-ab4.dtb
> with no twl changes.
> 
Sigh, I found the reason for immediately rebooting kernel from bash history:

"rm arch/arm/boot/zImage" followed by "cat
arch/arm/boot/dts/omap3-beagle-ab4.dtb >>arch/arm/boot/zImage; ma
LOADADDR=0x80008000 uImage", i.e. forgot to build the zImage between.

(alias ma='nice make -j `getconf _NPROCESSORS_ONLN` ARCH=arm
CROSS_COMPILE="ccache arm-linux-gnueabihf-"')

So yes, with your latest patch omap3-beagle-ab4.dtb behaves as unpatched
omap3-beagle.dtb (boots but timer issues when omap3_isp not loaded).

Jarkko