topic Running U-boot standalone API's in spicific core in i.MX Processors

Running U-boot standalone API's in spicific core

edwinkaus — Fri, 07 Sep 2018 09:52:54 GMT

I am working on Imx6 sabre SD free-scale board, we have u-boot compiled for the board also running an standalone API's(simple hello_world program) from u-boot.

But now I want to load & run this standalone application in any of specified core (other then core 0). By default u-boot runs in core 0 of processor.

what are the steps to initialize new core & switch to new core.

Can anyone help me or suggest some reference available.

Re: Running U-boot standalone API's in spicific core

igorpadykov — Fri, 07 Sep 2018 23:15:50 GMT

Hi Edwin

one can try to reuse sdk baremetal example (zip available on SMP Enable in IMX6 )

please check Chapter 3 Multicore Startup iMX6_Firmware_Guide.pdf included in its documentation.

Best regards
igor
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Re: Running U-boot standalone API's in spicific core

edwinkaus — Fri, 21 Sep 2018 08:58:55 GMT

Hi igorpadykov .,

Thanks for your reply.,

Here I am trying write my own bare metal program to initialize the secondary cores & enable.

I tried following steps:

>> I loaded the Hello_world.bin standalone program to the RAM(Addr: 0x10000000) using fatload command.

>> I have added an custom u-boot command in that I am initializing persistent bits of core 2(address) , Reset & Enable of core 2. as follows.

REG(SRC_GPR3) = 0x10000000; //Address of standalone bin file
val = REG(SRC_SCR);
val |= 1 << 14 ;
val |= 1 << 22 ;
REG(SRC_SCR) = val ; // RESET & Enable of secondary core

Up on entering the custom command I expect the standalone program to execute by secondary core, But its not working.

Can you please help me to resolve this issue.

Thank you.,

Regards

Edwin