On Wed, 2019-06-26 at 08:46 +0000, Yazdani, Reyhaneh wrote: > Hello everyone, > > > On the process of bring-up imx8mm board, I am at the point that load > bl31 and > jump to ATF.Upon exit from ATF's initialization routine, the > execution level > should be EL2. > > My question is about imx8mq_atf_load_bl31 function. > After copy BL31 into OCRAM address, the function sets up the sp_el2 > to > "MX8MQ_ATF_BL33_BASE_ADDR - 16". > > Can anyone explain me why this address? Because I am using the same > address for > imx8mm and it seems Barebox does not return to this point. sp_el2 is the address for the stack pointer in el2. This is done so there is a stack pointer setup after returning from TF-A. The TF-A return address is compiled into the TF-A and may be different for the imx8mm. Looking into the TF-A PLAT_NS_IMAGE_OFFSET is set to 0x40200000. So execution should continue after TF-A at this address. Regards, Rouven Czerwinski _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
