[U-Boot] [PATCH v6 5/8] mtd: nand: am335x: spl: Fix copying of image

[Lokesh Vutla]

When offset is not aligned to page address, it is possible that extra offset
will be read from nand. Adjust the image such that first byte of the image
is at load address after the first page is read.

Reviewed-by: Tom Rini <trini at konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
---
 drivers/mtd/nand/am335x_spl_bch.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/am335x_spl_bch.c b/drivers/mtd/nand/am335x_spl_bch.c
index bf8b2ee..31c7825 100644
--- a/drivers/mtd/nand/am335x_spl_bch.c
+++ b/drivers/mtd/nand/am335x_spl_bch.c
@@ -173,7 +173,7 @@ static int nand_read_page(int block, int page, void *dst)
 int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
 {
 	unsigned int block, lastblock;
-	unsigned int page;
+	unsigned int page, page_offset;
 
 	/*
 	 * offs has to be aligned to a page address!
@@ -181,6 +181,7 @@ int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
 	block = offs / CONFIG_SYS_NAND_BLOCK_SIZE;
 	lastblock = (offs + size - 1) / CONFIG_SYS_NAND_BLOCK_SIZE;
 	page = (offs % CONFIG_SYS_NAND_BLOCK_SIZE) / CONFIG_SYS_NAND_PAGE_SIZE;
+	page_offset = offs % CONFIG_SYS_NAND_PAGE_SIZE;
 
 	while (block <= lastblock) {
 		if (!nand_is_bad_block(block)) {
@@ -189,6 +190,18 @@ int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
 			 */
 			while (page < CONFIG_SYS_NAND_PAGE_COUNT) {
 				nand_read_page(block, page, dst);
+				/*
+				 * When offs is not aligned to page address the
+				 * extra offset is copied to dst as well. Copy
+				 * the image such that its first byte will be
+				 * at the dst.
+				 */
+				if (unlikely(page_offset)) {
+					memmove(dst, dst + page_offset,
+						CONFIG_SYS_NAND_PAGE_SIZE);
+					dst = (void *)((int)dst - page_offset);
+					page_offset = 0;
+				}
 				dst += CONFIG_SYS_NAND_PAGE_SIZE;
 				page++;
 			}
-- 
2.8.2