PHYTEC stores details about the hardware in an EEPROM on the SoM. We can utilize this information and chose the proper DDR timings accordingly.
Due to the limited SRAM memory on the AM62x, the concept was to store only the DDR timings deltas and not their full set, see Patch 4 & 5.
The last patch adds support for a 1 GB and 4 GB RAM variant of the phyCORE-AM62x.
Patch 4 & 5 are based on https://patchwork.ozlabs.org/project/uboot/list/?series=404273
Wadim Egorov (5): board: phytec: Make AM6 SoM detection depend on I2C board: phytec: Fix function definitions in AM6x SOM detection arm: mach-k3: am625: Call do_board_detect() before DDR probing board: phytec: common: Introduce a method to inject DDR timings deltas board: phytec: am62x: Add support for 1 & 4 GB RAM variants
arch/arm/mach-k3/am625_init.c | 2 + board/phytec/common/Kconfig | 2 + board/phytec/common/am6_som_detection.c | 18 +- board/phytec/common/am6_som_detection.h | 8 + board/phytec/common/k3/Makefile | 1 + board/phytec/common/k3/k3_ddrss_patch.c | 68 ++++++ board/phytec/common/k3/k3_ddrss_patch.h | 28 +++ board/phytec/phycore_am62x/MAINTAINERS | 1 + board/phytec/phycore_am62x/phycore-am62x.c | 152 ++++++++++++- board/phytec/phycore_am62x/phycore-ddr-data.h | 206 ++++++++++++++++++ configs/phycore_am62x_a53_defconfig | 4 + configs/phycore_am62x_r5_defconfig | 4 + 12 files changed, 483 insertions(+), 11 deletions(-) create mode 100644 board/phytec/common/k3/k3_ddrss_patch.c create mode 100644 board/phytec/common/k3/k3_ddrss_patch.h create mode 100644 board/phytec/phycore_am62x/phycore-ddr-data.h