linux-kernel - Re: your mail

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Date:   Mon, 17 Aug 2020 22:42:00 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Konrad Dybcio <konradybcio@...il.com>,
        Andy Gross <agross@...nel.org>,
        dt <devicetree@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: your mail

On Thu, 13 Aug 2020 at 12:38, Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Thu 06 Aug 15:31 PDT 2020, Konrad Dybcio wrote:
>
> > Subject: Re: [PATCH v4] arm64: dts: qcom: Add support for Xiaomi Poco F1 (Beryllium)
> >
> > >// This removed_region is needed to boot the device
> > >               // TODO: Find out the user of this reserved memory
> > >               removed_region: memory@...00000 {
> >
> > This region seems to belong to the Trust Zone. When Linux tries to access it, TZ bites and shuts the device down.
> >
>
> This is in line with what the documentation indicates and then it would
> be better to just bump &tz_mem to a size of 0x4900000.

Hi, so just to be sure that I got this right, you want me to extend
&tz_mem to the size of 0x4900000 from the default size of 0x2D00000 by
including this downstream &removed_region (of size 0x1A00000) +
previously unreserved downstream memory region (of size 0x200000), to
align with the starting address of &qseecom_mem?

I just gave this &tz_mem change a spin and I do not see any obvious
regression in my limited smoke testing (Boots AOSP to UI with
v5.9-rc1. Touch/BT/WiFi works) so far, with 20+ out-of-tree patches.

Regards,
Amit Pundir

>
> Regards,
> Bjorn