From 3395eb1a82f01b9b0b5160d384cf80f4a3a5a648 Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Sat, 24 Jun 2017 17:02:36 +0200
Subject: [PATCH] spi: flash: support the 256-byte wraparound when programming
 pages

---
 source/drivers/spi_flash.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/source/drivers/spi_flash.c b/source/drivers/spi_flash.c
index ed75778..bb1f533 100644
--- a/source/drivers/spi_flash.c
+++ b/source/drivers/spi_flash.c
@@ -130,6 +130,7 @@ static size_t spi_flash_write(struct flash_dev *dev, uint32_t addr,
 		spi_flash_addr(cmd, addr);
 
 		nbytes = min(len, 32);
+		nbytes = nbytes - ((addr + nbytes) & 0xff);
 
 		memmove(cmd + 4, data, nbytes);
 		spi_tx_rx(spi_dev, NULL, 0, cmd, 4 + nbytes);