Add 'license' command to U-Boot command line

The 'license' command includes the U-Boot license (GPLv2) into the
actual bootloader binary. The license text can be shown interactively
at the U-Boot commandline.

For products where the commandline can actually be accessed by the
end user, this helps to prevent inadvertent GPL violations, since the
GPLv2 license text can no longer be 'forgotten' to be included into
the product.

The 'license' command can be enabled by CONFIG_CMD_LICENSE.

Signed-off-by: Harald Welte <laforge@openmoko.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/common/cmd_license.c b/common/cmd_license.c
new file mode 100644
index 0000000..301af8d
--- /dev/null
+++ b/common/cmd_license.c
@@ -0,0 +1,59 @@
+/*
+ * (C) Copyright 2007 by OpenMoko, Inc.
+ * Author: Harald Welte <laforge@openmoko.org>
+ *
+ * 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
+ */
+
+#include <common.h>
+
+#if defined(CONFIG_CMD_LICENSE)
+
+/* COPYING is currently 15951 bytes in size */
+#define LICENSE_MAX	20480
+
+#include <command.h>
+#include <malloc.h>
+#include <license.h>
+int gunzip(void *, int, unsigned char *, unsigned long *);
+
+int do_license(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	char *tok, *dst = malloc(LICENSE_MAX);
+	unsigned long len = LICENSE_MAX;
+
+	if (!dst)
+		return -1;
+
+	if (gunzip(dst, LICENSE_MAX, license_gz, &len) != 0) {
+		printf("Error uncompressing license text\n");
+		free(dst);
+		return -1;
+	}
+	puts(dst);
+	free(dst);
+
+	return 0;
+}
+
+U_BOOT_CMD(license, 1, 1, do_license,
+	   "license - print GPL license text\n",
+	   NULL);
+
+#endif /* CONFIG_CMD_LICENSE */