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From: Iuliana Prodan <iuliana.prodan@nxp.com>
To: Peng Fan <peng.fan@oss.nxp.com>,
	"Iuliana Prodan (OSS)" <iuliana.prodan@oss.nxp.com>,
	Bjorn Andersson <andersson@kernel.org>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	"S.J. Wang" <shengjiu.wang@nxp.com>,
	Fabio Estevam <festevam@gmail.com>,
	Daniel Baluta <daniel.baluta@nxp.com>,
	Paul Olaru <paul.olaru@nxp.com>,
	Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Cc: linux-imx <linux-imx@nxp.com>,
	linux-remoteproc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Pengutronix Kernel Team <kernel@pengutronix.de>
Subject: Re: [PATCH v2] remoteproc: imx_dsp_rproc: add custom memory copy implementation for i.MX DSP Cores
Date: Wed, 1 Feb 2023 10:41:15 +0200	[thread overview]
Message-ID: <30b1aa51-2fac-16b8-8fba-e82a88e3219d@nxp.com> (raw)
In-Reply-To: <abd74bb6-9131-3769-513f-954234981403@oss.nxp.com>

Hi Peng,

On 2/1/2023 2:27 AM, Peng Fan wrote:
>
>
> On 2/1/2023 1:04 AM, Iuliana Prodan (OSS) wrote:
>> From: Iuliana Prodan <iuliana.prodan@nxp.com>
>>
>> The IRAM is part of the HiFi DSP.
>> According to hardware specification only 32-bits write are allowed
>> otherwise we get a Kernel panic.
>>
>> Therefore add a custom memory copy and memset functions to deal with
>> the above restriction.
>
> Which platform has this limitation? This driver has been landed for
> quite some time, is there any specific condition to trigger the issue?
>
> Regards,
> Peng.
>
Any platform with HiFi DSP.

As I explained in the previous version, until now, it was used in a 
limited scenario and the firmware was correctly built to respect the 
write restriction - having the IRAM sections size a multiple of 4bytes.

Now, I was trying a simple hello_world sample from Zephyr, compiled with 
GCC and I crashed the Kernel trying to load it on the hifi4 DSP.

Thanks,

Iulia


  reply	other threads:[~2023-02-01  8:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-31 17:04 [PATCH v2] remoteproc: imx_dsp_rproc: add custom memory copy implementation for i.MX DSP Cores Iuliana Prodan (OSS)
2023-02-01  0:27 ` Peng Fan
2023-02-01  8:41   ` Iuliana Prodan [this message]
2023-02-04  7:23 ` kernel test robot

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