From a060e34ff1d6710ace7ed73faa35bb49cad7dc31 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Tue, 1 Jul 2008 19:13:22 +0000
Subject: [PATCH] 2008-07-01	Joel Sherrill <joel.sherrill@oarcorp.com>

	* shared/uboot_getenv.c: New file.
---
 c/src/lib/libbsp/powerpc/ChangeLog            |  4 ++
 .../lib/libbsp/powerpc/shared/uboot_getenv.c  | 68 +++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 c/src/lib/libbsp/powerpc/shared/uboot_getenv.c

diff --git a/c/src/lib/libbsp/powerpc/ChangeLog b/c/src/lib/libbsp/powerpc/ChangeLog
index 2cd358f54e..bd98525401 100644
--- a/c/src/lib/libbsp/powerpc/ChangeLog
+++ b/c/src/lib/libbsp/powerpc/ChangeLog
@@ -1,3 +1,7 @@
+2008-07-01	Joel Sherrill <joel.sherrill@oarcorp.com>
+
+	* shared/uboot_getenv.c: New file.
+
 2008-06-02	Joel Sherrill <joel.sherrill@oarcorp.com>
 
 	* shared/startup/panic.c: Convention calls for leading underscore on
diff --git a/c/src/lib/libbsp/powerpc/shared/uboot_getenv.c b/c/src/lib/libbsp/powerpc/shared/uboot_getenv.c
new file mode 100644
index 0000000000..9fb5875c62
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/shared/uboot_getenv.c
@@ -0,0 +1,68 @@
+/*
+ *  COPYRIGHT (c) 1989-2008.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+/* Assumed to be provided by BSP */
+extern const uint8_t *uboot_environment;
+extern const size_t uboot_environment_size;
+
+/*
+ * The U-Boot source code appears to use the CRC32 code from zlib.
+ * But I cannot find a way to get the crc32() in zlib code to
+ * generate the CRC found in the Flash on the Icecube board.
+ * So for now, always return TRUE.
+ */
+static int bsp_uboot_environ_check_crc(void)
+{
+#if 0
+  unsigned long crc;
+  unsigned long max;
+
+  for (max=0 ; max <= 0x20000 ; max+=4 ) { 
+    crc = crc32( 0, NULL, 0 );
+    crc = crc32( crc, &uboot_environment[4], max);
+    printk( "crc=0x%08lx need %0x max=%d\n", crc,
+            *(int *)uboot_environment, max  );
+  }
+#endif
+  return 1;
+}
+
+const char *bsp_uboot_getenv(
+  const char *name
+)
+{
+  char   lhs[64];
+  size_t i, j;
+
+  if ( !bsp_uboot_environ_check_crc() )
+    return NULL;
+
+  for ( i=4 ; i<uboot_environment_size ; i++ ) {
+    memset( lhs, '\0', sizeof(lhs) );   
+    for( j=0 ; uboot_environment[i] != '=' && j<sizeof(lhs) ; i++, j++ ) {
+      lhs[j] = uboot_environment[i];
+    }
+    if ( !strncmp( name, lhs, sizeof(lhs) ) ) {
+      return (const char *)&uboot_environment[i+1];
+    }
+
+    for ( i++ ; uboot_environment[i] && i<uboot_environment_size ; i++ )
+      ;
+    if ( !uboot_environment[i+1] )
+      return NULL;
+  }
+  return NULL;
+}
+
+