On 6/26/19 12:25 PM, Rouven Czerwinski wrote: >> And what is the reason behind decreasing 16 from returning address: >> >> MX8MQ_ATF_BL33_BASE_ADDR - 16 >> >> I removed "16" for im8mq in Barebox and still works. > > This puts some distance between the stack and your execution address. > As long as nobody is writing to the stack pointer before increasing it > you are save and your return address is not overwritte. Your probably > save anyway since the instructions at the address > MX8MQ_ATF_BL33_BASE_ADDR are only executed once and don't manipulate > the stack. > > The stack pointer inherently has nothing to do with the return address, > you just have to make sure that the stack pointer is pointing to a > valid address, othwise you may get aborts on stack usage. Thanks for the explanation > >> The PLAT_NS_IMAGE_OFFSET is identical for imx8mq and imx8mm. Do you >> have any idea why the firmware is not returned to this address? >> Do we need to enable any special timer or clock for this point? >> I used the same firmware as I have used in UBoot, thus the firmware >> itself should be correct. > > It may be a good idea to build the TF-A yourself and enable the debug > output therein to make sure that TF-A is not missing a crucial setup > step. The TF-A can be found a > https://source.codeaurora.org/external/imx/imx-atf/ > pick one of the release branches, enable the debug console in > plat/imx/imx8mm/include/platform_def.h and build a Debug build with > make plat=imx8mm DEBUG=1. This helped me a lot. I found the reason. Actually the firmware did not execute to the end. I had to configure GIC to sys_pll2_100m in the first steps of low-level. Best regards, Reyhaneh > > Regards, > Rouven > -- Reyhaneh Yazdani Data Modul AG TEL: +49-89-56017-154 Embedded development FAX: +49-89-56017-119 Linux - Development RG: HR-Muenchen B-85591 Landsberger Str. 322 D-80687 Muenchen - http://www.data-modul.com Vertrauliche E-Mail von / Confidential e-mail from: DATA MODUL AG Vorstand / CEO: Dr. Florian Pesahl Vorsitzende des Aufsichtsrates / Chairwoman of the Supervisory Board: Kristin D. Russell Sitz der Gesellschaft / Registered Office: München Registergericht / Registration Court: München Handelsregister B 85 591 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
