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[patch] au1xxx: support YAMON and U-Boot

To: Ralf Baechle <ralf@linux-mips.org>
Subject: [patch] au1xxx: support YAMON and U-Boot
From: Domen Puncer <domen.puncer@ultra.si>
Date: Mon, 3 Jul 2006 08:17:09 +0200
Cc: linux-mips@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.11+cvs20060126
After (too) many emails with Sergei Shtylyov, we came up with this
patch to support YAMON and U-Boot style environments.


Signed-off-by: Domen Puncer <domen.puncer@ultra.si>

Index: linux-mailed/arch/mips/au1000/common/prom.c
===================================================================
--- linux-mailed.orig/arch/mips/au1000/common/prom.c
+++ linux-mailed/arch/mips/au1000/common/prom.c
@@ -1,7 +1,7 @@
 /*
  *
  * BRIEF MODULE DESCRIPTION
- *    PROM library initialisation code, assuming YAMON is the boot loader.
+ *    PROM library initialisation code, supports YAMON and U-Boot.
  *
  * Copyright 2000, 2001, 2006 MontaVista Software Inc.
  * Author: MontaVista Software, Inc.
@@ -46,12 +46,6 @@
 extern int prom_argc;
 extern char **prom_argv, **prom_envp;
 
-typedef struct
-{
-       char *name;
-       char *val;
-} t_env_var;
-
 
 char * prom_getcmdline(void)
 {
@@ -84,13 +78,21 @@ char *prom_getenv(char *envname)
 {
        /*
         * Return a pointer to the given environment variable.
+        * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
         */
 
-       t_env_var *env = (t_env_var *)prom_envp;
-
-       while (env->name) {
-               if (strcmp(envname, env->name) == 0)
-                       return env->val;
+       char **env = prom_envp;
+       int i = strlen(envname);
+       int yamon = (*env && strchr(*env, '=') == NULL);
+
+       while (*env) {
+               if (yamon) {
+                       if (strcmp(envname, *env++) == 0)
+                               return *env;
+               } else {
+                       if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
+                               return *env + i + 1;
+               }
                env++;
        }
        return NULL;

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