From a8beb53fa093c3a9a43289365245a26f3cc083a7 Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Fri, 16 Jun 2017 15:40:02 +0200
Subject: [PATCH] flash: implement a default function for copying data

---
 include/flash.h     |  2 ++
 source/core/flash.c | 26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/include/flash.h b/include/flash.h
index 8748068..2f45ce3 100644
--- a/include/flash.h
+++ b/include/flash.h
@@ -24,6 +24,8 @@ struct flash_dev {
 };
 
 int default_flash_is_erased(struct flash_dev *dev, uint32_t addr);
+size_t default_flash_copy(struct flash_dev *dev, uint32_t dst, uint32_t src,
+	size_t len);
 
 struct flash_dev *flash_probe(void);
 void flash_release(struct flash_dev *dev);
diff --git a/source/core/flash.c b/source/core/flash.c
index 47a6750..f86643f 100644
--- a/source/core/flash.c
+++ b/source/core/flash.c
@@ -29,6 +29,32 @@ int default_flash_is_erased(struct flash_dev *dev, uint32_t addr)
 	return 1;
 }
 
+size_t default_flash_copy(struct flash_dev *dev, uint32_t dst, uint32_t src,
+	size_t len)
+{
+	uint8_t data[32];
+	size_t nbytes, ret = 0;
+
+	while (len) {
+		nbytes = min(sizeof data, len);
+
+		if (flash_read(dev, src, data, nbytes) == 0)
+			return -1;
+
+		if (flash_write(dev, dst, data, nbytes) == 0)
+			return -1;
+
+		dst += nbytes;
+		src += nbytes;
+		len -= nbytes;
+		ret += nbytes;
+	}
+
+	return ret;
+}
+
+
+
 void flash_release(struct flash_dev *dev)
 {
 	if (!dev)