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Subject: Re: beaglebone black boot failure Linux v5.15.rc1
To:     Robert Nelson <robertcnelson@gmail.com>
CC:     Drew Fustini <pdp7pdp7@gmail.com>,
        Tony Lindgren <tony@atomide.com>,
        Matti Vaittinen <mazziesaccount@gmail.com>,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        "Vaittinen, Matti" <Matti.Vaittinen@fi.rohmeurope.com>,
        "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
        Paul Barker <paul.barker@sancloud.com>,
        Peter Ujfalusi <peter.ujfalusi@gmail.com>,
        =?UTF-8?Q?Beno=c3=aet_Cousson?= <bcousson@baylibre.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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From:   Suman Anna <s-anna@ti.com>
Message-ID: <066d9a7e-89c2-b8b5-b2cd-4993513f5a64@ti.com>
Date:   Tue, 21 Sep 2021 18:53:12 -0500
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On 9/21/21 5:00 PM, Robert Nelson wrote:
> On Tue, Sep 21, 2021 at 4:54 PM Suman Anna <s-anna@ti.com> wrote:
>>
>> On 9/21/21 3:29 PM, Drew Fustini wrote:
>>> On Tue, Sep 21, 2021 at 9:09 AM Suman Anna <s-anna@ti.com> wrote:
>>>>
>>>> Hi Matti, Tony,
>>>>
>>>> On 9/21/21 2:47 AM, Tony Lindgren wrote:
>>>>> * Matti Vaittinen <mazziesaccount@gmail.com> [210920 08:23]:
>>>>>> Finally, adding the udelay(100); (as Tony suggested) at the end of the
>>>>>> omap_reset_deassert() did make the oops go away even when pruss_tm was
>>>>>> enabled. I don't know what would be a proper fix though.
>>>>
>>>> I have been able to boot v5.15-rc1 just fine on my BBB without any additional
>>>> changes [1].
>>>>
>>>> May I ask what is your BBB board version? My board is rev.A5C.
>>>
>>> That rev is quite old [1].  Would you be able to try a Rev C?  It has
>>> been in production since around 2014 with the move from 2GB to 4GB
>>> eMMC.
>>
>> I don't have any rev.C boards handy to try.
>>
>> I am curious to see if there is some correlation between failures and board
>> versions. I see that there is a minor processor change to AM3358 from rev.B
>> onwards compared to the AM3359 that I would have on my board. PRU-ICSS IP would
>> be present and supported on both though.
> 
> Rev B vs Rev C shouldn't matter..  I don't think I even have a Rev
> "B".. A6A, B, to C* was done very quickly at CIrcuitCo at that time..
> 
> https://elinux.org/Beagleboard:BeagleBoneBlack#Revision_B
> 
> "This version moves to the AM3358BZCZ100 processor as we are no longer
> able to get the limited production version of the AM3359AZCZ100."
> 
> I'm assuming the AM3358 had the pru enabled..

Yes, PRU-ICSS is present on AM3356 and above.

regards
Suman