firmware-utils/mktplinkfw: allow to reserve space in the generated images
authorGabor Juhos <juhosg@openwrt.org>
Sat, 25 Jan 2014 18:12:03 +0000 (18:12 +0000)
committerGabor Juhos <juhosg@openwrt.org>
Sat, 25 Jan 2014 18:12:03 +0000 (18:12 +0000)
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 39396

tools/firmware-utils/src/mktplinkfw.c

index 1c3f49d..d15ca5b 100644 (file)
@@ -145,6 +145,8 @@ static int combined;
 static int strip_padding;
 static int add_jffs2_eof;
 static unsigned char jffs2_eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
+static uint32_t fw_max_len;
+static uint32_t reserved_space;
 
 static struct file_info inspect_info;
 static int extract = 0;
@@ -463,6 +465,7 @@ static void usage(int status)
 "  -v <version>    set firmware version to <version>\n"
 "  -i <file>       inspect given firmware file <file>\n"
 "  -x              extract kernel and rootfs while inspecting (requires -i)\n"
+"  -X <size>       reserve <size> bytes in the firmware image (hexval prefixed with 0x)\n"
 "  -h              show this screen\n"
        );
 
@@ -579,6 +582,13 @@ static int check_options(void)
        if (!rootfs_ofs)
                rootfs_ofs = layout->rootfs_ofs;
 
+       if (reserved_space > layout->fw_max_len) {
+               ERR("reserved space is not valid");
+               return -1;
+       }
+
+       fw_max_len = layout->fw_max_len - reserved_space;
+
        if (kernel_info.file_name == NULL) {
                ERR("no kernel image specified");
                return -1;
@@ -592,7 +602,7 @@ static int check_options(void)
 
        if (combined) {
                if (kernel_info.file_size >
-                   layout->fw_max_len - sizeof(struct fw_header)) {
+                   fw_max_len - sizeof(struct fw_header)) {
                        ERR("kernel image is too big");
                        return -1;
                }
@@ -614,7 +624,7 @@ static int check_options(void)
                        DBG("kernel length aligned to %u", kernel_len);
 
                        if (kernel_len + rootfs_info.file_size >
-                           layout->fw_max_len - sizeof(struct fw_header)) {
+                           fw_max_len - sizeof(struct fw_header)) {
                                ERR("images are too big");
                                return -1;
                        }
@@ -626,7 +636,7 @@ static int check_options(void)
                        }
 
                        if (rootfs_info.file_size >
-                           (layout->fw_max_len - rootfs_ofs)) {
+                           (fw_max_len - rootfs_ofs)) {
                                ERR("rootfs image is too big");
                                return -1;
                        }
@@ -1029,7 +1039,7 @@ int main(int argc, char *argv[])
        while ( 1 ) {
                int c;
 
-               c = getopt(argc, argv, "a:B:H:E:F:L:V:N:W:ci:k:r:R:o:xhsjv:");
+               c = getopt(argc, argv, "a:B:H:E:F:L:V:N:W:ci:k:r:R:o:xX:hsjv:");
                if (c == -1)
                        break;
 
@@ -1094,6 +1104,9 @@ int main(int argc, char *argv[])
                case 'h':
                        usage(EXIT_SUCCESS);
                        break;
+               case 'X':
+                       sscanf(optarg, "0x%x", &reserved_space);
+                       break;
                default:
                        usage(EXIT_FAILURE);
                        break;