From 26b4200ba5b87699435f167f12fe4532bf66ba4a Mon Sep 17 00:00:00 2001
From: Sascha Hauer <sha@octopus.labnet.pengutronix.de>
Date: Thu, 27 Sep 2007 16:34:00 +0200
Subject: [PATCH] add alternate command for ipe337 board

---
 board/ipe337/Makefile        |  1 +
 board/ipe337/cmd_alternate.c | 51 ++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 board/ipe337/cmd_alternate.c

diff --git a/board/ipe337/Makefile b/board/ipe337/Makefile
index 448133ceb..e16123812 100644
--- a/board/ipe337/Makefile
+++ b/board/ipe337/Makefile
@@ -1,3 +1,4 @@
 obj-y += ipe337.o
+obj-y += cmd_alternate.o
 
 extra-y += u-boot.lds
diff --git a/board/ipe337/cmd_alternate.c b/board/ipe337/cmd_alternate.c
new file mode 100644
index 000000000..fc4395331
--- /dev/null
+++ b/board/ipe337/cmd_alternate.c
@@ -0,0 +1,51 @@
+#include <common.h>
+#include <command.h>
+#include <linux/stat.h>
+#include <malloc.h>
+#include <fs.h>
+
+static int do_alternate (cmd_tbl_t *cmdtp, int argc, char *argv[])
+{
+	void *buf;
+	size_t size;
+	ulong *ptr, val = 0, bitcount = 0;
+
+	if (argc != 2) {
+		u_boot_cmd_usage(cmdtp);
+		return 1;
+	}
+
+	buf = read_file(argv[1], &size);
+	if (!buf)
+		return 1;
+
+	ptr = buf;
+
+	while ((ulong)ptr <= (ulong)buf + size && !(val = *ptr++))
+		bitcount += 32;
+
+	if (val) {
+		do {
+			if (val & 1)
+				break;
+			bitcount++;
+		} while (val >>= 1);
+	}
+
+	printf("bitcount : %d\n", bitcount);
+
+	free(buf);
+	return bitcount & 1 ? 2 : 3;
+}
+
+static __maybe_unused char cmd_alternate_help[] =
+"Usage: alternate <file>\n"
+"\n";
+
+U_BOOT_CMD_START(alternate)
+	.maxargs	= CONFIG_MAXARGS,
+	.cmd		= do_alternate,
+	.usage		= "count zero bits in a file",
+	U_BOOT_CMD_HELP(cmd_alternate_help)
+U_BOOT_CMD_END
+