# boards/raspi/board.mk -- Raspberry Pi 5 (BCM2712, Cortex-A76, aarch64).
#
# Native firmware boot, no UEFI (FABRIC-3.md §IV): the Pi 5 bootloader
# lives in EEPROM and reads config.txt, kernel_2712.img and the board DTB
# from the first FAT partition of the SD card. kernel_2712.img is the
# aarch64 kernel relinked at 0x80000 (kernel/linker/starkernel-native-rpi5.ld)
# and flattened to a raw binary.
#
# The DTB is the Raspberry Pi firmware's own stock file, not built here. It
# is fetched once from the pinned firmware release below into build/cache/
# unless RPI5_DTB points at a local copy.
BOARD_DESC  := Raspberry Pi 5 (BCM2712, Cortex-A76, native firmware boot)
BOARD_ARCH  := aarch64
BOARD_BOOT  := rpi-native
BOARD_IMAGE := lithos-raspi.img
RPI_FIRMWARE_TAG ?= 1.20260915
RPI5_DTB_URL     ?= https://raw.githubusercontent.com/raspberrypi/firmware/$(RPI_FIRMWARE_TAG)/boot/bcm2712-rpi-5-b.dtb
RPI5_DTB         ?= build/cache/raspi-$(RPI_FIRMWARE_TAG)/bcm2712-rpi-5-b.dtb