stm32/boards/LEGO_HUB_NO6: Add comment re constraints on SPI flash cfg.

dpgeorge · dpgeorge · commit 25f30eb8a683 · 2021-09-02T00:03:41.000+10:00
Signed-off-by: Damien George &lt;damien@micropython.org&gt;
diff --git a/ports/stm32/boards/LEGO_HUB_NO6/mpconfigboard.h b/ports/stm32/boards/LEGO_HUB_NO6/mpconfigboard.h
@@ -79,6 +79,7 @@
 
 // SPI flash, for R/W storage
 // The first 1MiB is skipped because it's used by the built-in bootloader
+// Note: MICROPY_HW_SPIFLASH_OFFSET_BYTES must be a multiple of MP_SPIFLASH_ERASE_BLOCK_SIZE
 #define MICROPY_HW_SPIFLASH_OFFSET_BYTES         (1024 * 1024)
 #define MICROPY_HW_SPIFLASH_BLOCKMAP(bl)         ((bl) + MICROPY_HW_SPIFLASH_OFFSET_BYTES / FLASH_BLOCK_SIZE)
 #define MICROPY_HW_SPIFLASH_BLOCKMAP_EXT(bl)     ((bl) + MICROPY_HW_SPIFLASH_OFFSET_BYTES / MP_SPIFLASH_ERASE_BLOCK_SIZE)
