The Phytec Tauri L is sold with multiple memory configurations beyond the
base 2 GB variant. To support these alternative capacities seamlessly,
read the physical memory size directly from the EEPROM of the underlying
phyCORE module and apply the appropriate DDR timing parameters at runtime.
Alternatively, a fixed memory configuration can still be enforced via a
dedicated Kconfig option if dynamic detection is not desired.
Note that while U-Boot correctly discovers the full physical memory bank,
the device tree excludes the memory beyond 3 GB (below the 4 GB boundary).
This ensures that U-Boot allocations and early EFI staging buffers remain
safe from 32-bit interconnect DMA limitations inherent to some i.MX8MM
IP blocks.
Signed-off-by: INgo Rah <ingo.rah@linutronix.de>
Reviewed-by: Gregor Herburger <gregor.herburger@linutronix.de>
Reviewed-by: Benedikt Spranger <b.spranger@linutronix.de>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Yannic Moog <y.moog@phytec.de>
INgo RahandFabio Estevam
14ca9eb18d