[PATCH 1/2] Move /dev/zero to separate unit

[Alexander Shiyan]

This patch allows to present "/dev/zero" always in system and not
depending  of mem-command. Standard files allow to test other memory
devices, not only "mem", such as NOR, NAND, MCI-devices e.t.c.

Signed-off-by: Alexander Shiyan <shc_work at mail.ru>
---
 commands/Makefile |    1 +
 commands/mem.c    |   29 -----------------------------
 commands/stddev.c |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 52 insertions(+), 29 deletions(-)
 create mode 100644 commands/stddev.c

diff --git a/commands/Makefile b/commands/Makefile
index 4c8a0a9..d39c466 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -1,3 +1,4 @@
+obj-y				+= stddev.o
 obj-$(CONFIG_CMD_BOOTM)		+= bootm.o
 obj-$(CONFIG_CMD_UIMAGE)	+= uimage.o
 obj-$(CONFIG_CMD_LINUX16)	+= linux16.o
diff --git a/commands/mem.c b/commands/mem.c
index 080bfde..9a67cf3 100644
--- a/commands/mem.c
+++ b/commands/mem.c
@@ -623,32 +623,3 @@ static int mem_init(void)
 }
 
 device_initcall(mem_init);
-
-static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
-{
-	memset(buf, 0, count);
-	return count;
-}
-
-static struct file_operations zeroops = {
-	.read  = zero_read,
-	.lseek = dev_lseek_default,
-};
-
-static int zero_init(void)
-{
-	struct cdev *cdev;
-
-	cdev = xzalloc(sizeof (*cdev));
-
-	cdev->name = "zero";
-	cdev->size = ~0;
-	cdev->ops = &zeroops;
-
-	devfs_create(cdev);
-
-	return 0;
-}
-
-device_initcall(zero_init);
-
diff --git a/commands/stddev.c b/commands/stddev.c
new file mode 100644
index 0000000..18fea94
--- /dev/null
+++ b/commands/stddev.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2011 Sascha Hauer <s.hauer at pengutronix.de>, Pengutronix
+ *
+ * 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 version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <init.h>
+
+static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
+{
+	memset(buf, 0, count);
+	return count;
+}
+
+static struct file_operations zeroops = {
+	.read  = zero_read,
+	.lseek = dev_lseek_default,
+};
+
+static int zero_init(void)
+{
+	struct cdev *cdev;
+
+	cdev = xzalloc(sizeof (*cdev));
+
+	cdev->name = "zero";
+	cdev->size = ~0;
+	cdev->ops = &zeroops;
+
+	devfs_create(cdev);
+
+	return 0;
+}
+
+device_initcall(zero_init);
-- 
1.7.3.4