[RFC PATCH 02/10] stm32mp: dfu: Move the ram partitions to the end of the dfu_alt_info variable

[Sughosh Ganu]

With the FWU multi bank update feature enabled, the dfu alt no that is
used to identify the partition to be updated is derived at runtime and
should match the partition number on the storage media. Achieve this
by moving the ram partitions to the end of the dfu_alt_info variable.

Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
---
 board/st/common/stm32mp_dfu.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/board/st/common/stm32mp_dfu.c b/board/st/common/stm32mp_dfu.c
index 00d1fb8f59..394a2704ee 100644
--- a/board/st/common/stm32mp_dfu.c
+++ b/board/st/common/stm32mp_dfu.c
@@ -102,6 +102,7 @@ static void board_get_alt_info_mtd(struct mtd_info *mtd, char *buf)
 
 void set_dfu_alt_info(char *interface, char *devstr)
 {
+	int len;
 	struct udevice *dev;
 	struct mtd_info *mtd;
 
@@ -112,9 +113,6 @@ void set_dfu_alt_info(char *interface, char *devstr)
 
 	memset(buf, 0, sizeof(buf));
 
-	snprintf(buf, DFU_ALT_BUF_LEN,
-		 "ram 0=%s", CONFIG_DFU_ALT_RAM0);
-
 	if (CONFIG_IS_ENABLED(MMC)) {
 		if (!uclass_get_device(UCLASS_MMC, 0, &dev))
 			board_get_alt_info_mmc(dev, buf);
@@ -151,6 +149,13 @@ void set_dfu_alt_info(char *interface, char *devstr)
 			strncat(buf, "&virt 1=PMIC", DFU_ALT_BUF_LEN);
 	}
 
+	len = strlen(buf);
+	if (buf[0] != '\0')
+		len += snprintf(buf + len, DFU_ALT_BUF_LEN - len, "&");
+
+	snprintf(buf + len, DFU_ALT_BUF_LEN,
+		 "ram 0=%s", CONFIG_DFU_ALT_RAM0);
+
 	env_set("dfu_alt_info", buf);
 	puts("DFU alt info setting: done\n");
 }
-- 
2.17.1