i.MX93 Linux OCRAM as shared memory

chrishoen — Wed, 28 Aug 2024 22:36:38 GMT

Hello

I'm working with an imx93, non-secure.

Here's my problem: I want to use ocram as shared memory between the linux a55 and the m33.

I have a linux user space test program and an m33 test program that can both access the ocram, but only the first 96KB (20480000 - 20497fff). Can I get more of it? The full 640KB?

The linux test program uses mmap at 0x20480000. It gives a bus error if it goes at or above 0x20498000.

Note: I won't be using the ethosu or rpmsg at all.

How does linux use ocram? Can I increase the 96KB to 640KB?

Thanks
Chris

Re: i.MX93 Linux OCRAM as shared memory

Zhiming_Liu — Fri, 30 Aug 2024 07:59:20 GMT

You can try to modify ocram permission settings in ATF:plat/imx/imx93/trdc_config.h

Add more memory blocks in trdc_n_mbc, 0-5 means six memory blocks(6*16KB=96KB), you need add more.

Best Regards
Zhiming

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i.MX93 Linux OCRAM as shared memory

Re: i.MX93 Linux OCRAM as shared memory