feat(stm32h7): poll the LAN8740A link state and fix SDRAM2 heap overlap - #392
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The STM32H750B-DK has no PHY interrupt wired to the MCU, so the driver never published carrier state and a cable plugged in after boot was never detected. Add a BOARD_ETH_PHY_POLL option that samples the LAN8740A BMSR from LPWORK every 500 ms, debounces two matching samples before publishing the state, and reports an MDIO failure only once. Also stop registering SDRAM bank 2 as heap. The LTDC framebuffers live at the start of that bank (0xd0000000), so arm_addregion() put the allocator's own metadata at the framebuffer addresses: a display refresh corrupted the heap, and any traversal of it (mallinfo(), and therefore free/mb) tripped the consistency check in mm_foreach(). Leaving BOARD_SDRAM2_SIZE undefined keeps the bank for the framebuffer alone; DTCM, SRAM1-3, SRAM4 and AXI SRAM (~940 KB) remain as heap. The board init scripts mount procfs/tmpfs/devfs and back /data with a RAM disk, which is where the agent keeps its configuration and session state until a persistent filesystem is available. Signed-off-by: 3181619934 <3181619938@qq.com>
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