linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845-db845c: Mark cont splash memory region as reserved

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <027268b7-4b04-f52e-06a8-9d924dc6efe4@linaro.org>
Date:   Thu, 9 Feb 2023 12:22:55 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dt <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-db845c: Mark cont splash memory
 region as reserved

On 09/02/2023 12:11, Bryan O'Donoghue wrote:
>> If the bootloader splash is enabled then this memory is used until the
>> DPU driver instructs MDP5 pipes to suck data from a newly assigned 
>> address,
>> so there's a short window where it is.
> 
> It seems a shame to reserve 30 something megabytes of memory for 
> continuous splash unless we are actually using it is my point.
> 
> If I'm running headless its just wasted memory.

Couldn't we

1. Find reserved continuous splash memory
2. Fee it in the MDP when we make the transition

It must be possible

---
bod