flash: check if a block is erased in chunks of 32 bytes

source/core/flash.c

@@ -2,18 +2,28 @@
 #include <stdlib.h>
 
 #include <flash.h>
+#include <macros.h>
 
 int default_flash_is_erased(struct flash_dev *dev, uint32_t addr)
 {
-	uint8_t data[1 << dev->log2_block_size];
-	size_t i;
+	uint8_t data[32];
+	size_t i, nbytes, len = 1 << dev->log2_block_size;
 
-	if (flash_read(dev, addr << dev->log2_block_size, data, sizeof(data)) == 0)
-		return 0;
+	addr <<= dev->log2_block_size;
+
+	while (len) {
+		nbytes = min(32, len);
 
-	for (i = 0; i < sizeof(data); ++i) {
-		if (data[i] != 0xff)
+		if (flash_read(dev, addr, data, nbytes) == 0)
 			return 0;
+
+		for (i = 0; i < sizeof(data); ++i) {
+			if (data[i] != 0xff)
+				return 0;
+		}
+
+		addr += nbytes;
+		len -= nbytes;
 	}
 
 	return 1;