Hello,
We're testing the NXP ANDROID Q10.0.0_2.3.0 release on our own board, which has an iMX8MM and 4GB of LPDDR4 memory, and we're observing both display and PCIe issues whenever we configure U-Boot to use all 4GB (using the imx8mm_evk_4g_android_defconfig).
The display issue happens after Android is initialized and consists of some parts of the display showing the expected content and other parts flickering with contents of old frames.
As for the PCIe, we have a WiFi module connected to it, and although the PCIe driver itself doesn't show any errors, the Wifi module driver fails during initialization.
Both problems only happen when 4G is enabled on U-boot, by setting the following lines in the file include/configs/imx8mm_evk_android.h.
#define PHYS_SDRAM_2 0x100000000
#define PHYS_SDRAM_2_SIZE 0x40000000 /* 1GB */
If we restrict to only 3GB of memory, none of the issues happen.
I read on the i.MX 8M Mini Reference Manual that only 3GB of RAM memory is available to all modules, and the rest can only be used by the ARM Cores, so I wonder if there might be some memory allocation issue on the GPU and PCIe drivers.
