[lantiq] Support booting the Speedport W502V using BRN-BOOT.

While the disadvantage is less available flash space, it's easy and
safe to flash without opening the device.
Going back to the original firmware is also possible.

This patch add two firmware utilities, mkbrncmdline and mkbrnboot.

mkbrncmdline patches the uncompressed kernel so the registeres a0 to
a3 are initialized and the memory size is passed in.

mkbrnboot takes the lzma compressed kernel and squashfs images and
creates a firmware image that can be flashed using the BRN-BOOT
recovery kernel, which is booted by holding both buttons when
powering up the device and will listen on http://192.168.2.1.

The firmware file from bin/lantiq/ to use is
openwrt-lantiq-danube-ARV4525PW-BRNDTW502-brnImage

The BRN-BOOT recovery kernel does size-check the image, so if it's
too big to fit into flash it will complain accordingly.

A second patch is needed to make the wired network interface work
since there is no u-boot to pre-initialise it.

Signed-off-by: Tobias Diedrich <ranma+openwrt@tdiedrich.de>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30532 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 168 insertions, 0 deletions

diff --git a/tools/firmware-utils/src/mkbrncmdline.c b/tools/firmware-utils/src/mkbrncmdline.c
new file mode 100644
index 000000000..6eb4bfe7c
--- /dev/null
+++ b/tools/firmware-utils/src/mkbrncmdline.c
@@ -0,0 +1,168 @@
+/*
+ * mkbrncmdline.c - partially based on OpenWrt's wndr3700.c
+ *
+ * Copyright (C) 2011 Tobias Diedrich <ranma+openwrt@tdiedrich.de>
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <inttypes.h>
+
+static void usage(const char *) __attribute__ (( __noreturn__ ));
+
+static void usage(const char *mess)
+{
+	fprintf(stderr, "Error: %s\n", mess);
+	fprintf(stderr, "Usage: mkbrncmdline -i input_file -o output_file [-a loadaddress] arg1 [argx ...]\n");
+	fprintf(stderr, "\n");
+	exit(1);
+}
+
+static char *input_file = NULL;
+static char *output_file = NULL;
+static unsigned loadaddr = 0x80002000;
+
+static void parseopts(int *argc, char ***argv)
+{
+	char *endptr;
+	int res;
+
+	while ((res = getopt(*argc, *argv, "a:i:o:")) != -1) {
+		switch (res) {
+		default:
+			usage("Unknown option");
+			break;
+		case 'a':
+			loadaddr = strtoul(optarg, &endptr, 0);
+			if (endptr == optarg || *endptr != 0)
+				usage("loadaddress must be a decimal or hexadecimal 32-bit value");
+			break;
+		case 'i':
+			input_file = optarg;
+			break;
+		case 'o':
+			output_file = optarg;
+			break;
+		}
+	}
+	*argc -= optind;
+	*argv += optind;
+}
+
+static void emitload(int outfd, int reg, unsigned value)
+{
+	char buf[8] = {
+		0x3c, 0x04 + reg,
+		value >> 24, value >> 16,
+		0x34, 0x84 + reg + (reg << 5),
+		value >> 8, value,
+	};
+	if (write(outfd, buf, sizeof(buf)) != sizeof(buf)) {
+		fprintf(stderr, "write: %s\n", strerror(errno));
+		exit(1);
+	}
+}
+
+int main(int argc, char **argv)
+{
+	int outfd;
+	int i;
+	int fd;
+	size_t len, skip, buf_len;
+	unsigned cmdline_addr;
+	unsigned s_ofs;
+	char *buf;
+
+	parseopts(&argc, &argv);
+
+	if (argc < 1)
+		usage("must specify at least one kernel cmdline argument");
+
+	if (input_file == NULL || output_file == NULL)
+		usage("must specify input and output file");
+
+	if ((outfd = open(output_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
+	{
+		fprintf(stderr, "Error opening '%s' for writing: %s\n", output_file, strerror(errno));
+		exit(1);
+	}
+
+	// mmap input_file
+	if ((fd = open(input_file, O_RDONLY))  < 0
+	|| (len = lseek(fd, 0, SEEK_END)) < 0
+	|| (input_file = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1)
+	|| close(fd) < 0)
+	{
+		fprintf(stderr, "Error mapping file '%s': %s\n", input_file, strerror(errno));
+		exit(1);
+	}
+
+	cmdline_addr = loadaddr + len;
+
+	// Kernel args are passed in registers a0,a1,a2 and a3
+	emitload(outfd, 0, 0);              /* a0 = 0 */
+	emitload(outfd, 1, 0);              /* a1 = 0 */
+	emitload(outfd, 2, cmdline_addr);   /* a2 = &cmdline */
+	emitload(outfd, 3, 0);              /* a3 = 0 */
+	skip = lseek(outfd, 0, SEEK_END);
+
+	// write the kernel
+	if (write(outfd, input_file + skip, len - skip) != len -skip) {
+		fprintf(stderr, "write: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	// write cmdline structure
+	buf_len = (argc + 1) * 4;
+	for (i=0; i<argc; i++) {
+		buf_len += strlen(argv[i]) + 1;
+	}
+	buf = malloc(buf_len + 16);
+	if (!buf) {
+		fprintf(stderr, "Could not allocate memory for cmdline buffer\n");
+		exit(1);
+	}
+	memset(buf, 0, buf_len);
+
+	s_ofs = 4 * (argc + 1);
+	for (i=0; i<argc; i++) {
+		unsigned s_ptr = cmdline_addr + s_ofs;
+		buf[i * 4 + 0] = s_ptr >> 24;
+		buf[i * 4 + 1] = s_ptr >> 16;
+		buf[i * 4 + 2] = s_ptr >>  8;
+		buf[i * 4 + 3] = s_ptr >>  0;
+		memcpy(&buf[s_ofs], argv[i], strlen(argv[i]));
+		s_ofs += strlen(argv[i]) + 1;
+	}
+	if (write(outfd, buf, buf_len) != buf_len) {
+		fprintf(stderr, "write: %s\n", strerror(errno));
+		exit(1);
+	}
+
+
+	munmap(input_file, len);
+	close(outfd);
+	free(buf);
+
+	return 0;
+}