[PATCH v2 2/5] bootm: Append bootargs value when bootmeth_android provide cmdline

[George Chan <gchan9527@gmail.com>]

Old logic wipe bootargs env with cmdline, new logic maintain the
value by prepending cmdline value to bootargs.

Signed-off-by: George Chan <gchan9527@gmail.com>
---
 boot/bootm.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/boot/bootm.c b/boot/bootm.c
index f6aa32746b7..888684a91f5 100644
--- a/boot/bootm.c
+++ b/boot/bootm.c
@@ -1152,11 +1152,38 @@ int bootm_boot_start(ulong addr, const char *cmdline)
 
 	snprintf(addr_str, sizeof(addr_str), "%lx", addr);
 
-	ret = env_set("bootargs", cmdline);
+	if (IS_ENABLED(CONFIG_ANDROID_BOOT_IMAGE_PREPEND_ENV_BOOTARGS)) {
+		char *bootargs;
+		char *newbootargs;
+		bootargs = env_get("bootargs");
+		ret = strlen(bootargs) + strlen(cmdline) + 2;
+
+		newbootargs = malloc(ret);
+
+		*newbootargs = '\0';
+
+		if (*newbootargs) /* If there is something in newbootargs, a space is needed */
+			strcat(newbootargs, " ");
+		strcat(newbootargs, cmdline);
+
+		if (*newbootargs) /* If there is something in newbootargs, a space is needed */
+			strcat(newbootargs, " ");
+		strcat(newbootargs, bootargs);
+
+		/* force to terminate the string */
+		memset(newbootargs + MAX_CMDLINE_SIZE - 2, '\0', 1);
+
+		ret = env_set("bootargs", newbootargs);
+
+		free(newbootargs);
+	} else
+		ret = env_set("bootargs", cmdline);
+
 	if (ret) {
 		printf("Failed to set cmdline\n");
 		return ret;
 	}
+
 	bootm_init(&bmi);
 	bmi.addr_img = addr_str;
 	bmi.cmd_name = "bootm";

-- 
2.43.0