linux-kernel - Re: [v5,08/13] ARM: dts: ipq4019: Add ipq4019-ap.dk07.1 common data

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Message-ID: <4e687302-6c42-315b-e76d-2274131da3a0@codeaurora.org>
Date:   Wed, 18 Apr 2018 12:42:18 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Sven Eckelmann <sven.eckelmann@...nmesh.com>
Cc:     robh+dt@...nel.org, robh@...nel.org, mark.rutland@....com,
        linux@...linux.org.uk, andy.gross@...aro.org,
        david.brown@...aro.org, catalin.marinas@....com,
        will.deacon@....com, sboyd@...eaurora.org,
        bjorn.andersson@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        absahu@...eaurora.org, marc.zyngier@....com,
        richardcochran@...il.com
Subject: Re: [v5,08/13] ARM: dts: ipq4019: Add ipq4019-ap.dk07.1 common data

Hi Sven,

On 4/18/2018 12:29 PM, Sven Eckelmann wrote:
> On Freitag, 23. März 2018 15:48:51 CEST Sricharan R wrote:
>> Add the common data for all dk07 based boards.
>>
>> Reviewed-by: Abhishek Sahu <absahu@...eaurora.org>
>> Signed-off-by: Sricharan R <sricharan@...eaurora.org>
>> ---
>>  arch/arm/boot/dts/qcom-ipq4019-ap.dk07.1.dtsi | 69 +++++++++++++++++++++++++++
>>  1 file changed, 69 insertions(+)
>>  create mode 100644 arch/arm/boot/dts/qcom-ipq4019-ap.dk07.1.dtsi
> 
> The no-map reserved-memory for tz and smem are missing. Linux doesn't have 
> control over these regions and they are placed in the middle of the ram before 
> Linux even starts. And u-boot is also not adding these ranges automatically.
> 
>     	reserved-memory {
>     		#address-cells = <0x1>;
>     		#size-cells = <0x1>;
>     		ranges;
>     
>     		smem@...00000 {
>     			reg = <0x87e00000 0x080000>;
>     			no-map;
>     		};
>     
>     		tz@...80000 {
>     			reg = <0x87e80000 0x180000>;
>     			no-map;
>     		};
>     	};
> 
> This can either (depending on HW/SW configuration) lead to a failed boot [1] 
> or to runtime crashes like:
> 
>     root@...nWrt:/# /tmp/memory-allocator-test
>     main 0
>     [  571.758058] Unhandled fault: imprecise external abort (0xc06) at 0x01715ff8
>     [  571.758099] pgd = cebec000
>     [  571.763826] [01715ff8] *pgd=8e7fa835, *pte=87e7f75f, *ppte=87e7fc7f
>     Bus error
> 
> I would not know how to disable QSEE on these boards and thus would assume 
> that it should be part of this dtsi.

 As we discussed offline, i agree that the smem and tz reserved memory nodes need to
 be added. It still boots today without that, but would abort when that memory
 region is allocated and written. I will add the reserved-memory node for that
 in V6 along with other comments.

Regards,
 Sricharan

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