[PATCH v4 23/25] spl: nand: support loading legacy image with payload compressed

[Weijie Gao]

Add support to load legacy image with payload compressed. This redirects
the boot flow for all legacy images. If the payload is not compresses, the
actual behavior will remain unchanged.

Signed-off-by: Weijie Gao <weijie.gao at mediatek.com>
---
v4 changes: new
---
 common/spl/spl_nand.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/common/spl/spl_nand.c b/common/spl/spl_nand.c
index fc61b447a5..8b563d9a6f 100644
--- a/common/spl/spl_nand.c
+++ b/common/spl/spl_nand.c
@@ -59,6 +59,21 @@ static ulong spl_nand_fit_read(struct spl_load_info *load, ulong offs,
 	return size / load->bl_len;
 }
 
+static ulong spl_nand_legacy_read(struct spl_load_info *load, ulong offs,
+				  ulong size, void *dst)
+{
+	int err;
+
+	debug("%s: offs %lx, size %lx, dst %p\n",
+	      __func__, offs, size, dst);
+
+	err = nand_spl_load_image(offs, size, dst);
+	if (err)
+		return 0;
+
+	return size;
+}
+
 struct mtd_info * __weak nand_get_mtd(void)
 {
 	return NULL;
@@ -96,6 +111,18 @@ static int spl_nand_load_element(struct spl_image_info *spl_image,
 		load.bl_len = bl_len;
 		load.read = spl_nand_fit_read;
 		return spl_load_imx_container(spl_image, &load, offset / bl_len);
+	} else if (IS_ENABLED(CONFIG_SPL_LEGACY_IMAGE_SUPPORT) &&
+		   image_get_magic(header) == IH_MAGIC) {
+		struct spl_load_info load;
+
+		debug("Found legacy image\n");
+		load.dev = NULL;
+		load.priv = NULL;
+		load.filename = NULL;
+		load.bl_len = 1;
+		load.read = spl_nand_legacy_read;
+
+		return spl_load_legacy_img(spl_image, bootdev, &load, offset);
 	} else {
 		err = spl_parse_image_header(spl_image, bootdev, header);
 		if (err)
-- 
2.17.1