linux-kernel - Re: [PATCH 6/7] bus: ti-sysc: Implement SoC revision handling

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Message-ID: <YiG4O2h4oVX7CqIe@atomide.com>
Date:   Fri, 4 Mar 2022 08:56:59 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Adam Ford <aford173@...il.com>
Cc:     Linux-OMAP <linux-omap@...r.kernel.org>,
        "Andrew F . Davis" <afd@...com>, Dave Gerlach <d-gerlach@...com>,
        Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Roger Quadros <rogerq@...com>, Suman Anna <s-anna@...com>,
        Tero Kristo <t-kristo@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        André Hentschel <nerv@...ncrow.de>,
        "H . Nikolaus Schaller" <hns@...delico.com>
Subject: Re: [PATCH 6/7] bus: ti-sysc: Implement SoC revision handling

Hi,

* Adam Ford <aford173@...il.com> [220302 14:37]:
> I apologize for digging up an old thread, but I finally managed to get
> my hands on an OMAP3503.  It seems like older kernels do not boot at
> all or hang somewhere in the boot process.  I am still seeing a
> difference in behavior between OMAP3503 and OMAP3530, where 3505
> throws a bunch of splat and a kernel panic, while the 3530 appears to
> boot happily.
> 
> Using the latest 5.17-rc6, I had to remove some IVA and SGX references
> from omap_l3_smx.h to get the 3503 to stop crashing on boot.

OK interesting, I did not know those registers are not accessible
on 3503.

> Do you have any ideas how we can make the omap3_l3_app_bases and
> omap3_l3_debug_bases more cleanly remove the IVA and SGX references
> if/when OMAP3503 is detected?  I assume the same algorithm would have
> to detect a AM3703 as well.  I'm trying to get my hands on an AM3703
> to see if there is similar behavior as what I'm seeing on the
> OMAP3503.

As there are possibly multiple omap3 variants used on the same
boards, we need to rely on the runtime detection of the SoC.
So yeah soc_device_attribute is the way to go here.

I don't recall any similar issues booting 3703 but it's been a while
so worth testing for sure.

Regards,

Tony