topic Re: SCFW: how to use RPC protocol to get a resource access from Linux, to use a hw peripheral in i.MX Processors

SCFW: how to use RPC protocol to get a resource access from Linux, to use a hw peripheral

dry — Tue, 04 Oct 2022 02:39:26 GMT

Anyone can provide a detailed code example of how to use this RPC protocol, to communicate from the Ax cores/Linux to SCFW or the cores that own a resource I want, to get access to that resource...?

Can I do / use The Resource Management (RM) API" this way, through RPC ..?

Does this only work at kernel level, and then needs a user-space client, like scfw_cli app...?

I don't understand how scfw_cli app works, can it invoke Any of those SCFW APi calls ..? Can it do the RM stuff...? Example please ..??

Re: SCFW: how to use RPC protocol to get a resource access from Linux, to use a hw peripheral

jimmychan — Wed, 12 Oct 2022 07:38:27 GMT

You could download the SCFW porting kit from here. There is source code and the documentation in the porting kit.

https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX

e.g. SCFW Porting Kit 1.14.0

Re: SCFW: how to use RPC protocol to get a resource access from Linux, to use a hw peripheral

dry — Wed, 12 Oct 2022 10:04:08 GMT

@jimmychan

Yes, I got it, and seems you have to modify Linux kernel to allow user-space app to use the SC services ...

Also no clear example how to, for example, ask resource owner to use it from another domain .?

Re: SCFW: how to use RPC protocol to get a resource access from Linux, to use a hw peripheral

jimmychan — Thu, 13 Oct 2022 07:15:03 GMT

Maybe this one more useful for you.

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/System-Controller-Firmware-101-Getting-started/ta-p/1121153

Re: SCFW: how to use RPC protocol to get a resource access from Linux, to use a hw peripheral

13614278 — Tue, 31 Jan 2023 08:20:48 GMT

Yeah, no offensive, but I have to say, it is really pity that the document is too poor for this scfw api.

It seems there are so many pdf/html, but just a full list plain text, without any useful info

Re: SCFW: how to use RPC protocol to get a resource access from Linux, to use a hw peripheral

flobro — Mon, 07 Jul 2025 14:20:03 GMT

Posting links to the SCFW porting guide is not a reasonable answer to the questions. At least tell people that there is currently NO solution to user space SCFW register access unless YOU write a device driver yourself (and the user space app that uses it). I would love to read the pad/mux register to verify the settings, but no such luck.

I have read the porting guide and it is not helpful to someone who wants to possibly write a driver to set/get values for development mode.

Re: SCFW: how to use RPC protocol to get a resource access from Linux, to use a hw peripheral

flobro — Mon, 07 Jul 2025 14:27:47 GMT

also, where is the document "System Controller Firmware Command Line Utility for Linux and QNX"?

The links all still point to "https://source.codeaurora.org/external/imxsupport/scfw_cli/"