---

yaml
---
r: 28755
b: refs/heads/master
c: 30d8caf
h: refs/heads/master
i:
  28753: a75b6e5
  28751: 609285a
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 204face4fb3ba2ca09a4073e7debc595e14c2388
+refs/heads/master: 30d8caf7c625203b295a78f143820cdc3124830b

trunk/arch/powerpc/boot/main.c

@@ -33,6 +33,14 @@ extern char _vmlinux_end[];
 extern char _initrd_start[];
 extern char _initrd_end[];
 
+/* A buffer that may be edited by tools operating on a zImage binary so as to
+ * edit the command line passed to vmlinux (by setting /chosen/bootargs).
+ * The buffer is put in it's own section so that tools may locate it easier.
+ */
+static char builtin_cmdline[512]
+	__attribute__((section("__builtin_cmdline")));
+
+
 struct addr_range {
 	unsigned long addr;
 	unsigned long size;
@@ -204,6 +212,23 @@ static int is_elf32(void *hdr)
 	return 1;
 }
 
+void export_cmdline(void* chosen_handle)
+{
+        int len;
+        char cmdline[2] = { 0, 0 };
+
+	if (builtin_cmdline[0] == 0)
+		return;
+
+        len = getprop(chosen_handle, "bootargs", cmdline, sizeof(cmdline));
+        if (len > 0 && cmdline[0] != 0)
+		return;
+
+	setprop(chosen_handle, "bootargs", builtin_cmdline,
+		strlen(builtin_cmdline) + 1);
+}
+
+
 void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
 {
 	int len;
@@ -289,6 +314,8 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
 		memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
 	}
 
+	export_cmdline(chosen_handle);
+
 	/* Skip over the ELF header */
 #ifdef DEBUG
 	printf("... skipping 0x%lx bytes of ELF header\n\r",

trunk/arch/powerpc/boot/prom.h

@@ -31,4 +31,11 @@ static inline int getprop(void *phandle, const char *name,
 	return call_prom("getprop", 4, 1, phandle, name, buf, buflen);
 }
 
+
+static inline int setprop(void *phandle, const char *name,
+			  void *buf, int buflen)
+{
+	return call_prom("setprop", 4, 1, phandle, name, buf, buflen);
+}
+
 #endif				/* _PPC_BOOT_PROM_H_ */