linux-kernel - Re: Starting app on i.MX8MM M4 core from DDR via remoteproc

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Message-ID: <07bdb54a-d5c8-ed3b-a1a4-8d43c27cac3b@kontron.de>
Date:   Wed, 22 Mar 2023 10:57:12 +0100
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        NXP Linux Team <linux-imx@....com>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        Dong Aisheng <aisheng.dong@....com>
Subject: Re: Starting app on i.MX8MM M4 core from DDR via remoteproc

On 22.03.23 09:46, Frieder Schrempf wrote:
> Hello,
> 
> I'm having problems with running an application from DDR memory on the
> M4 core of an i.MX8MM using remoteproc in Linux.
> 
> * starting the app compiled for internal RAM from Linux works fine
> * starting the app compiled for DDR from U-Boot works fine
> * starting the app compiled for DDR from Linux doesn't show any output
> on the M4 debug UART
> 
> Below there is some more information on my setup. If anyone has an idea
> for debugging this, please let me know.

I just came across Peng's patches [1] that add support for firmware in
DDR. With this applied it seems to work now!

[1]
https://patchwork.kernel.org/project/linux-remoteproc/cover/20230209063816.2782206-1-peng.fan@oss.nxp.com/