[U-Boot-Users] [patch] allow ports to override bootelf behavior

[Mike Frysinger <vapier@gentoo.org>]

This splits the dcache logic out of do_bootelf into a dedicated weak function
called do_bootelf_exec.  This way ports can control the behavior before
executing an ELF image however they like.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
diff --git a/common/cmd_elf.c b/common/cmd_elf.c
index 2eb7453..5689e2c 100644
--- a/common/cmd_elf.c
+++ b/common/cmd_elf.c
@@ -30,6 +30,31 @@ DECLARE_GLOBAL_DATA_PTR;
 int valid_elf_image (unsigned long addr);
 unsigned long load_elf_image (unsigned long addr);
 
+__attribute__((weak))
+unsigned long do_bootelf_exec (ulong (*entry)(int, char *[]), int argc, char *argv[])
+{
+	unsigned long ret;
+
+	/*
+	 * QNX images require the data cache is disabled.
+	 * Data cache is already flushed, so just turn it off.
+	 */
+	int dcache = dcache_status ();
+	if (dcache)
+		dcache_disable ();
+
+	/*
+	 * pass address parameter as argv[0] (aka command name),
+	 * and all remaining args
+	 */
+	ret = entry (argc, argv);
+
+	if (dcache)
+		dcache_enable ();
+
+	return ret;
+}
+
 /* ======================================================================
  * Interpreter command to boot an arbitrary ELF image from memory.
  * ====================================================================== */
@@ -53,18 +78,7 @@ int do_bootelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 
 	printf ("## Starting application at 0x%08lx ...\n", addr);
 
-	/*
-	 * QNX images require the data cache is disabled.
-	 * Data cache is already flushed, so just turn it off.
-	 */
-	if (dcache_status ())
-		dcache_disable ();
-
-	/*
-	 * pass address parameter as argv[0] (aka command name),
-	 * and all remaining args
-	 */
-	rc = ((ulong (*)(int, char *[])) addr) (--argc, &argv[1]);
+	rc = do_bootelf_exec ((void *)addr, argc - 1, argv + 1);
 	if (rc != 0)
 		rcode = 1;