From 5a7d4885100f23fb33d624dd047c6ea49c959300 Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Thu, 5 Jul 2007 18:02:16 +0200
Subject: [PATCH] svn_rev_676

---
 commands/Kconfig  |   7 ++-
 commands/Makefile |   1 +
 commands/crc.c    | 107 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 114 insertions(+), 1 deletion(-)
 create mode 100644 commands/crc.c

diff --git a/commands/Kconfig b/commands/Kconfig
index 61ee8c549..c09a14e41 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -125,7 +125,12 @@ config CMD_MEMINFO
 
 config CMD_MEMORY
 	bool
-	prompt "md, mm, mw and several others"
+	prompt "md and mw"
+
+config CMD_CRC
+	bool
+	select CRC32
+	prompt "crc"
 
 config CMD_MTEST
 	bool
diff --git a/commands/Makefile b/commands/Makefile
index e4c38c12e..733deb1b3 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -27,3 +27,4 @@ obj-$(CONFIG_CMD_CAT)		+= cat.o
 obj-$(CONFIG_CMD_MOUNT)		+= mount.o
 obj-$(CONFIG_CMD_UMOUNT)	+= umount.o
 obj-$(CONFIG_CMD_REGINFO)	+= reginfo.o
+obj-$(CONFIG_CMD_CRC)		+= crc.o
diff --git a/commands/crc.c b/commands/crc.c
new file mode 100644
index 000000000..d4e3590fc
--- /dev/null
+++ b/commands/crc.c
@@ -0,0 +1,107 @@
+#include <common.h>
+#include <command.h>
+
+#ifndef CONFIG_CRC32_VERIFY
+
+int do_mem_crc (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	ulong addr, length;
+	ulong crc;
+	ulong *ptr;
+
+	if (argc < 3) {
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+	addr = simple_strtoul (argv[1], NULL, 16);
+
+	length = simple_strtoul (argv[2], NULL, 16);
+
+	crc = crc32 (0, (const uchar *) addr, length);
+
+	printf ("CRC32 for %08lx ... %08lx ==> %08lx\n",
+			addr, addr + length - 1, crc);
+
+	if (argc > 3) {
+		ptr = (ulong *) simple_strtoul (argv[3], NULL, 16);
+		*ptr = crc;
+	}
+
+	return 0;
+}
+
+#else	/* CONFIG_CRC32_VERIFY */
+
+int do_mem_crc (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	ulong addr, length;
+	ulong crc;
+	ulong *ptr;
+	ulong vcrc;
+	int verify;
+	int ac;
+	char **av;
+
+	if (argc < 3) {
+  usage:
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+	av = argv + 1;
+	ac = argc - 1;
+	if (strcmp(*av, "-v") == 0) {
+		verify = 1;
+		av++;
+		ac--;
+		if (ac < 3)
+			goto usage;
+	} else
+		verify = 0;
+
+	addr = simple_strtoul(*av++, NULL, 16);
+	length = simple_strtoul(*av++, NULL, 16);
+
+	crc = crc32(0, (const uchar *) addr, length);
+
+	if (!verify) {
+		printf ("CRC32 for %08lx ... %08lx ==> %08lx\n",
+				addr, addr + length - 1, crc);
+		if (ac > 2) {
+			ptr = (ulong *) simple_strtoul (*av++, NULL, 16);
+			*ptr = crc;
+		}
+	} else {
+		vcrc = simple_strtoul(*av++, NULL, 16);
+		if (vcrc != crc) {
+			printf ("CRC32 for %08lx ... %08lx ==> %08lx != %08lx ** ERROR **\n",
+					addr, addr + length - 1, crc, vcrc);
+			return 1;
+		}
+	}
+
+	return 0;
+
+}
+#endif	/* CONFIG_CRC32_VERIFY */
+
+#ifndef CONFIG_CRC32_VERIFY
+
+U_BOOT_CMD_START(crc32)
+	.maxargs	= 4,
+	.cmd		= do_mem_crc,
+	.usage		= "checksum calculation",
+	U_BOOT_CMD_HELP("address count [addr]\n    - compute CRC32 checksum [save at addr]\n")
+U_BOOT_CMD_END
+
+#else	/* CONFIG_CRC32_VERIFY */
+
+U_BOOT_CMD(
+	crc32,    5,    0,     do_mem_crc,
+	"crc32   - checksum calculation\n",
+	"address count [addr]\n    - compute CRC32 checksum [save at addr]\n"
+	"-v address count crc\n    - verify crc of memory area\n"
+);
+
+#endif	/* CONFIG_CRC32_VERIFY */