Currently most boards that have static memory config (which cannot be detected automatically) use CONFIG_SYS_SDRAM_SIZE to define the size of memory which is hard coded into U-Boot. With the addition of device tree support into U-Boot, boards that have device tree data can instead query the memory bank information from the embedded or appended device tree. This allows for more dynamic memory configuration and avoids the need to hard code memory configuration into U-Boot.
The first patch of this series adds two helper functions for handling the memory bank decoding and initialization of global data which can be used by boards in their dram_init and dram_init_banksize functions. The purpose of these helper functions is to provide generic functions that handle the decoding and setup of memory and memory banks for boards that intend to use this mechanism.
The series also changes the zynq and zynqmp board implementations to use these functions to resolve a issue with static variable use.
Changes in v2: * Make fdtdec_setup_memory_banksize() return value consistent * Add more detail into the function documentation
Changes in v3: * Wrap the fdtdec_setup_memory_banksize() function with an #if on CONFIG_NR_DRAM_BANKS, so that the function is only available for configs that have memory banks available in bd_t.
Nathan Rossi (3): fdt: add memory bank decoding functions for board setup ARM: zynq: Replace board specific with generic memory bank decoding ARM64: zynqmp: Replace board specific with generic memory bank decoding
board/xilinx/zynq/board.c | 112 ++----------------------------------------- board/xilinx/zynqmp/zynqmp.c | 112 ++----------------------------------------- include/fdtdec.h | 34 +++++++++++++ lib/fdtdec.c | 56 ++++++++++++++++++++++ 4 files changed, 96 insertions(+), 218 deletions(-)