linux-kernel - Re: beaglebone black boot failure Linux v5.15.rc1

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Date:   Fri, 24 Sep 2021 13:40:35 -0500
From:   Robert Nelson <robertcnelson@...il.com>
To:     "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Paul Barker <paul.barker@...cloud.com>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Benoît Cousson <bcousson@...libre.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Suman Anna <s-anna@...com>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: beaglebone black boot failure Linux v5.15.rc1

On Wed, Sep 22, 2021 at 4:28 AM Vaittinen, Matti
<Matti.Vaittinen@...rohmeurope.com> wrote:
>
> On 9/21/21 19:40, H. Nikolaus Schaller wrote:
> > Hi Matti, Tony,
> >
> >> Am 21.09.2021 um 18:07 schrieb Suman Anna <s-anna@...com>:
> >>
> >> Hi Matti, Tony,
> >>
> >> On 9/21/21 2:47 AM, Tony Lindgren wrote:
> >>> * Matti Vaittinen <mazziesaccount@...il.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].
> >
> > Same for me with a v5.15-rc1 based kernel.
> >
> >> May I ask what is your BBB board version? My board is rev.A5C.
> >
> > I have an Rev B6 with EXP41 display attached. I think Matti reported a Rev C board?
>
> Oops. Yes I did. I _thought_ I have Rev-C (3?) boards. Not exactly sure
> why I think so - perhaps that was what I ordered... And I really think
> the ones connected to automated test setup at the office are Rev-C.
>
> Now that I tried to verify this - The one which I used to reproduce this
> issue (and now verify the patch from Tony) at home, seems to have say
> "PCB Rev6B" on PCB. However the u-boot says:
>
> =>  printenv board_rev
> board_rev=00C0
> =>
>
> but I have no idea where the environment variable comes from...
>
> Maybe a stupid question - how to find out the exact revision?

Run:

hexdump -e '8/1 "%c"' /sys/bus/i2c/devices/0-0050/eeprom -n 28 | cut -b 5-28

Then lookup:

https://github.com/beagleboard/image-builder/blob/master/readme.md

Regards,

-- 
Robert Nelson
https://rcn-ee.com/