topic Re: SCFW and cortex-A lpuart in i.MX Processors

SCFW and cortex-A lpuart

rkohli2000 — Wed, 12 Aug 2020 21:02:38 GMT

Hi,

I'm using iMX8QM MEK. I would like to use the M4_0 UART (J18 debug port) from the Cortex-A cores (A53 or A72). I will need to change the SCFW to initialize power for the UART for Cortex-A. Also, not move it to the M4 partition. But, I'm not sure where this change for SCFW is required. Or if this is just a build flag change (D=2).

Do I need to use the "imx-scfw-porting-kit-1.5.0" software and can someone suggest what are the changes to be made to SCFW ?

What other initialization steps on the Cortex-A53 side can I use to access the UART debug port without any u-boot present in my image ?

Thanks

Re: SCFW and cortex-A lpuart

igorpadykov — Wed, 12 Aug 2020 23:50:57 GMT

Hi rkohli2000

yes it is necessary to use imx-scfw-porting-kit, example with FlexCan can be found

on below link, in similar way one can change uart configuration

System Controller Firmware 101 - Resource management service

Best regards
igor
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Re: SCFW and cortex-A lpuart

rkohli2000 — Thu, 13 Aug 2020 12:26:18 GMT

Thanks Igor.