[PATCH v2] remoteproc: imx_dsp_rproc: add custom memory copy implementation for i.MX DSP Cores

[Iuliana Prodan]

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 at 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