Hi On Wed, Mar 15, 2023 at 3:13 PM Frieder Schrempf <frieder.schre...@kontron.de> wrote: > > Hi, > > I'm trying to bring up a new board based on the i.MX8MP and I have an > issue I'm hoping someone can help solving. > > I'm seeing failures in the early SPL code, usually in the DDR > initialization. Often they look like: > > U-Boot SPL 2023.04-rc3 (Mar 07 2023 - 14:32:34 +0000) > Training FAILED > Failed to initialize DDR RAM! > ### ERROR ### Please RESET the board ### > > But sometimes ddr_init() doesn't even return an error and only the > get_ram_size() afterwards which tries to allocate the memory fails. >
In my experience you don't have space inside the cpu internal memory. It means that you overlap some stack with the code. Change the printf means move a bit. So you have problem but depends what you are going to destroy Michael > The strange thing is that the issues appear or disappear > deterministically on the binary level. This means I sometimes get a > U-Boot binary which runs just fine in 100% of cases. Then I change for > example one of the following: > > * Adding a single printf() somewhere in the boards spl.c > * Using the same binary but booting from SD card instead of USB loader > * Using the same source but switching from the OS cross compiler to the > one from Yocto/OE > > And afterwards I get 100% failure rate with an error as described above. > > My suspicion is that there is some memory corruption/conflict. My SPL is > quite large and I wonder if it exceeds some limit. > > SPL is loaded to 0x920000 and CONFIG_SPL_STACK is set to 0x960000, which > leaves 256 KiB in between for the SPL. But all i.MX8MP boards seem to > set CONFIG_SPL_MAX_SIZE=0x26000 (152 KiB) for some reason. My > u-boot-spl-ddr.bin currently has around 193 KiB but I don't get any > warning about exceeding the SPL_MAX_SIZE. > > My questions: > > * Why is CONFIG_SPL_MAX_SIZE set to 152 KiB? > * Why is there no warning in my case? > * Any other ideas or pointers? > > Thanks for your help! > > Best regards > Frieder -- Michael Nazzareno Trimarchi Co-Founder & Chief Executive Officer M. +39 347 913 2170 mich...@amarulasolutions.com __________________________________ Amarula Solutions BV Joop Geesinkweg 125, 1114 AB, Amsterdam, NL T. +31 (0)85 111 9172 i...@amarulasolutions.com www.amarulasolutions.com