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6900fe621c
Set CONFIG_STM32H7_DTCMEXCLUDE=y on the four STM32H7 ARK boards (fmu-v6x, fmu-v6s, fpv, pi6x) so DTCM is no longer part of the kernel heap. Stacks and dynamic buffers can otherwise land in DTCM, which AHB DMA masters (SDMMC IDMA, MDMA, BDMA, DMA1/2) cannot access, causing file operations to fail with EIO/ETIMEDOUT. Refs PX4/PX4-Autopilot#27242.