On 07/02/2013 07:02:21 AM, João Fernandes wrote:
As the subject says, I'm trying to run the "Hello world" standalone application example on a core other than 0, on a Freescale QorIQ P4080.
I tried through the shell and programmatically by exporting cpu_release function... nothing. My first thought was that only core 0 has register r2 with the address of the "global_data" structure, so I tried to set it on the other cores, but still nothing. Help on this matter is highly appreciated.
If you mean a U-Boot application, this is not supported. U-Boot doesn't run on cores other than 0, except for a small stub for the spin table code.
If you have true standalone code, you can release it on other CPUs using the "cpu <n> release" command. That code will not have access to any U-Boot functionality. Its entry state will be as described for secondary CPUs in ePAPR. It will be the same as if an OS were spinning up its secondary cores by writing directly to the spin table.
-Scott