linux-kernel - Re: [PATCH 1/6] arm64: dts: qcom: sm8150: add apps

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Date:   Fri, 5 Jun 2020 10:10:29 -0400
From:   Jonathan Marek <jonathan@...ek.ca>
To:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        devicetree-owner@...r.kernel.org
Subject: Re: [PATCH 1/6] arm64: dts: qcom: sm8150: add apps_smmu node

On 6/5/20 10:03 AM, Sai Prakash Ranjan wrote:
> On 2020-05-29 08:45, Bjorn Andersson wrote:
>> On Thu 28 May 20:02 PDT 2020, Jonathan Marek wrote:
>>
>>>
>>>
>>> On 5/28/20 10:52 PM, Bjorn Andersson wrote:
>>> > On Sat 23 May 19:38 PDT 2020, Jonathan Marek wrote:
>>> >
>>> > > Add the apps_smmu node for sm8150. Note that adding the iommus 
>>> field for
>>> > > UFS is required because initializing the iommu removes the bypass 
>>> mapping
>>> > > that created by the bootloader.
>>> > >
>>> >
>>> > Unrelated to the patch itself; how do you disable the splash screen on
>>> > 8150? "fastboot oem select-display-panel none" doesn't seem to work 
>>> for
>>> > me on the MTP - and hence this would prevent my device from booting.
>>> >
>>> > Thanks,
>>> > Bjorn
>>> >
>>>
>>> I don't have a MTP, but on HDK855, "fastboot oem select-display-panel 
>>> none"
>>> combined with setting the physical switch to HDMI mode (which 
>>> switches off
>>> the 1440x2560 panel) gets it to not setup the display at all (just the
>>> fastboot command isn't enough).
>>>
>>
>> Okay, I don't think we have anything equivalent on the MTP, but good to
>> know.
>>
> 
> Actually I tried out this in SM8150 MTP and it works fine for me,
> 
> "fastboot set_active a; fastboot set_active b; fastboot set_active a; 
> fastboot oem select-display-panel none; fastboot reboot bootloader; 
> fastboot boot boot-sm8150.img"
> 
> Also I need to switch slots everytime like above, otherwise I always see 
> some error
> while loading the boot image.
> 

What is the error? If it is "FAILED (remote: Failed to load/authenticate 
boot image: Load Error)" then flashing/erasing boot_a will make it go 
away ("fastboot erase boot_a") for the next 6 or so "failed" boots.

> Thanks,
> Sai
>