Initial revision

1 files changed, 138 insertions, 0 deletions

diff --git a/common/env_nvram.c b/common/env_nvram.c
new file mode 100644
index 0000000..fdfa4fc
--- /dev/null
+++ b/common/env_nvram.c
@@ -0,0 +1,138 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
+ *
+ * It might not be possible in all cases to use 'memcpy()' to copy
+ * the environment to NVRAM, as the NVRAM might not be mapped into
+ * the memory space. (I.e. this is the case for the BAB750). In those
+ * cases it might be possible to access the NVRAM using a different
+ * method. For example, the RTC on the BAB750 is accessible in IO
+ * space using its address and data registers. To enable usage of
+ * NVRAM in those cases I invented the functions 'nvram_read()' and
+ * 'nvram_write()', which will be activated upon the configuration
+ * #define CFG_NVRAM_ACCESS_ROUTINE. Note, that those functions are
+ * strongly dependent on the used HW, and must be redefined for each
+ * board that wants to use them.
+ */
+
+#include <common.h>
+
+#ifdef CFG_ENV_IS_IN_NVRAM /* Environment is in NVRAM */
+
+#include <command.h>
+#include <environment.h>
+#include <cmd_nvedit.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+
+#ifdef CFG_NVRAM_ACCESS_ROUTINE
+extern void *nvram_read(void *dest, const long src, size_t count);
+extern void nvram_write(long dest, const void *src, size_t count);
+env_t *env_ptr = NULL;
+#else
+env_t *env_ptr = (env_t *)CFG_ENV_ADDR;
+#endif
+
+char * env_name_spec = "NVRAM";
+
+extern uchar default_environment[];
+extern int default_environment_size;
+
+extern uchar (*env_get_char)(int);
+extern uchar env_get_char_memory (int index);
+
+
+uchar env_get_char_spec (int index)
+{
+#ifdef CFG_NVRAM_ACCESS_ROUTINE
+	uchar c;
+
+	nvram_read(&c, CFG_ENV_ADDR+index, 1);
+
+	return c;
+#else
+	DECLARE_GLOBAL_DATA_PTR;
+
+	return *((uchar *)(gd->env_addr + index));
+#endif
+}
+
+void env_relocate_spec (void)
+{
+#if defined(CFG_NVRAM_ACCESS_ROUTINE)
+	nvram_read(env_ptr, CFG_ENV_ADDR, CFG_ENV_SIZE);
+#else
+	memcpy (env_ptr, (void*)CFG_ENV_ADDR, CFG_ENV_SIZE);
+#endif
+}
+
+int saveenv (void)
+{
+	int rcode = 0;
+
+#ifdef CFG_NVRAM_ACCESS_ROUTINE
+	nvram_write(CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE);
+#else
+	if (memcpy ((char *)CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE) == NULL)
+		    rcode = 1 ;
+#endif
+	return rcode;
+}
+
+
+/************************************************************************
+ * Initialize Environment use
+ *
+ * We are still running from ROM, so data use is limited
+ */
+int env_init (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+#if defined(CFG_NVRAM_ACCESS_ROUTINE)
+	ulong crc;
+	uchar data[ENV_SIZE];
+	nvram_read (&crc, CFG_ENV_ADDR, sizeof(ulong));
+	nvram_read (data, CFG_ENV_ADDR+sizeof(ulong), ENV_SIZE);
+
+	if (crc32(0, data, ENV_SIZE) == crc) {
+		gd->env_addr  = (ulong)CFG_ENV_ADDR + sizeof(long);
+#else
+	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
+		gd->env_addr  = (ulong)&(env_ptr->data);
+#endif
+		gd->env_valid = 1;
+	} else {
+		gd->env_addr  = (ulong)&default_environment[0];
+		gd->env_valid = 0;
+	}
+
+	return (0);
+}
+
+#endif /* CFG_ENV_IS_IN_NVRAM */