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- qspi: both XSPI variants poll the status flags with no bound, so an unresponsive bus hangs the caller and silently defeats the timeout it passed in. Route every wait through the timeout-carrying helpers, return -RT_ETIMEOUT and disable the controller on failure, and replace the "poll then send" loops with one bounded wait per element. - hard_i2c: the interrupt receive path programs the BYTENUM window once and never reloads it, so a longer message was truncated and still reported as success; refuse it with -RT_EINVAL (enable RX DMA for longer reads) instead of capping XferSize. Stop capping the transmit byte count at the window size as well: BYTENUM counts received bytes only, and the cap stopped feeding DAT after byte 255 while TXDATE stayed asserted. Reject RT_I2C_NO_START/RT_I2C_NO_STOP on the series without frame chaining, where they would silently become a fresh START and a STOP, and tear the DMA channel down when the address phase times out instead of leaving it armed against a buffer about to unwind. - spi: the H7xx LLI chain advanced the memory side by SPI_DMA_BLOCK_MAX bytes although BlkTfrSize counts elements, so a 16-bit transfer walked half a word early per node; advance by elements and scale both the chunk offset and the staging buffer by the data width. Propagate the DMA arm failure that was ignored. - nand: an odd data length has no halfword-only encoding on the 16-bit bus and padding would program a byte the caller never asked for, so refuse it before the command phase; issue the empty-page dummy store as a halfword there too, where 8-bit AHB writes are unsupported. - Kconfig: gate the Ethernet/SDRAM/LCD/QSPI/NAND options behind BSP_PERIPH_PIN_CFG_READY on all three boards. The peripheral clock and IO are not configured for these boards yet, so selecting one of them builds a driver whose pins stay in the reset function.