Is the DTCM/ITCM accessible through the A-53 core in the 8Mplus?

[jose_au_zone]

I'm trying to access the DTCM using /dev/mem on 8mplus and the board is hanging.

The reference manual is bit ambiguous because the region is on the a-53 memory map, like in the picture below

Bu in the beginning of the same section of the manual, it looks like its available only for the M7 core:

Thanks!

[igorpadykov]

Hi Jose

one can try to set proper RDC permissions using Table 3-4. Memory Region Mapping

i.MX 8M Plus Applications Processor Reference Manual

Best regards
igor

[jose_au_zone]

Thanks!

Should I use the SDK API for that?

https://mcuxpresso.nxp.com/api_doc/dev/1425/a00017.html

I know that this SDK writes directly to registers in the processor, but since this is running on top of Linux, I'm getting segfaults while trying to run any command on it that writes to those registers

Am I'm doing something wrong here?

[igorpadykov]

in linux rdc is configured in atf (struct imx_rdc_cfg rdc[])

https://source.codeaurora.org/external/imx/imx-atf/tree/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c?h=...

Best regards
igor