firmware-utils: mktplinkfw: rework combined image option

We use combined option in "mktplinkfw" tool for generating initramfs
kernel images and header for kernel inside "safeloader" image type (in
fact, only for TL-WR1043ND v4 at this moment).

There is also "mktplinkfw-kernel" tool, a stripped-down version, used
only for generating "simple" header, for safeloader image types.

This changes how "mktplinkfw" handles combined images (which then will
allow us to drop the stripped-down version of the tool):

- drop "ignore size" command line option (it was used only for combined
  images anyway)
- don't require "flash layout id" for combined images (we don't need and
  shouldn't limit size of the initramfs kernel and for kernels inside
  safeloader images, the "tplink-safeloader" tool does the size check)
- require kernel address and entry point in command line parameters for
  combined images (consequence of previous point)
- don't include md5 sum and firmware length values in header (they are
  needed only for update from vendor GUI and are ingored in case of
  initramfs and "tplink-safeloader" images)
- drop "fake" flash layout for TL-WR1043ND v4 as it's no longer needed

Also, adjust "mktplinkfw-combined" command in ar71xx/image/tp-link.mk to
match introduced changes in "mktplinkfw" tool.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

diff --git a/src/mktplinkfw.c b/src/mktplinkfw.c
index 93db44135728dba51b0883051d67a206934ec150..c5378620500b60c7670f2e07df3e1a3dca17150e 100644 (file)
--- a/src/mktplinkfw.c
+++ b/src/mktplinkfw.c
@@ -117,7 +117,6 @@ static uint32_t rootfs_align;
 static struct file_info boot_info;
 static int combined;
 static int strip_padding;
-static int ignore_size;
 static int add_jffs2_eof;
 static unsigned char jffs2_eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
 static uint32_t fw_max_len;
@@ -180,20 +179,6 @@ static struct flash_layout layouts[] = {
                .kernel_la      = 0x00000000 ,
                .kernel_ep      = 0xc0000000,
                .rootfs_ofs     = 0x2a0000,
-       }, {
-               /*
-                       Some devices (e.g. TL-WR1043 v4) use a mktplinkfw kernel image
-                       embedded in a tplink-safeloader image as os-image partition.
-
-                       We use a 1.5MB partition for the compressed kernel, which should
-                       be sufficient, but not too wasteful (the flash of the TL-WR1043 v4
-                       has 16MB in total).
-               */
-               .id             = "16Msafeloader",
-               .fw_max_len     = 0x180000,
-               .kernel_la      = 0x80060000,
-               .kernel_ep      = 0x80060000,
-               .rootfs_ofs     = 0,
        }, {
                /* terminating entry */
        }
@@ -272,7 +257,6 @@ static void usage(int status)
 "  -R <offset>     overwrite rootfs offset with <offset> (hexval prefixed with 0x)\n"
 "  -o <file>       write output to the file <file>\n"
 "  -s              strip padding from the end of the image\n"
-"  -S              ignore firmware size limit (only for combined images)\n"
 "  -j              add jffs2 end-of-filesystem markers\n"
 "  -N <vendor>     set image vendor to <vendor>\n"
 "  -V <version>    set image version to <version>\n"
@@ -362,7 +346,7 @@ static int check_options(void)
        }
        hw_id = strtoul(opt_hw_id, NULL, 0);
 
-       if (layout_id == NULL) {
+       if (!combined && layout_id == NULL) {
                ERR("flash layout is not specified");
                return -1;
        }
@@ -380,26 +364,31 @@ static int check_options(void)
                }
        }
 
-       layout = find_layout(layout_id);
-       if (layout == NULL) {
-               ERR("unknown flash layout \"%s\"", layout_id);
-               return -1;
-       }
+       if (combined) {
+               if (!kernel_la || !kernel_ep) {
+                       ERR("kernel loading address and entry point must be specified for combined image");
+                       return -1;
+               }
+       } else {
+               layout = find_layout(layout_id);
+               if (layout == NULL) {
+                       ERR("unknown flash layout \"%s\"", layout_id);
+                       return -1;
+               }
 
-       if (!kernel_la)
-               kernel_la = layout->kernel_la;
-       if (!kernel_ep)
-               kernel_ep = layout->kernel_ep;
-       if (!rootfs_ofs)
-               rootfs_ofs = layout->rootfs_ofs;
+               if (!kernel_la)
+                       kernel_la = layout->kernel_la;
+               if (!kernel_ep)
+                       kernel_ep = layout->kernel_ep;
+               if (!rootfs_ofs)
+                       rootfs_ofs = layout->rootfs_ofs;
 
-       if (reserved_space > layout->fw_max_len) {
-               ERR("reserved space is not valid");
-               return -1;
+               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;
@@ -411,18 +400,9 @@ static int check_options(void)
 
        kernel_len = kernel_info.file_size;
 
-       if (combined) {
-               exceed_bytes = kernel_info.file_size - (fw_max_len - sizeof(struct fw_header));
-               if (exceed_bytes > 0) {
-                       if (!ignore_size) {
-                               ERR("kernel image is too big by %i bytes", exceed_bytes);
-                               return -1;
-                       }
-                       layout->fw_max_len = sizeof(struct fw_header) +
-                                            kernel_info.file_size +
-                                            reserved_space;
-               }
-       } else {
+       if (!combined) {
+               fw_max_len = layout->fw_max_len - reserved_space;
+
                if (rootfs_info.file_name == NULL) {
                        ERR("no rootfs image specified");
                        return -1;
@@ -494,17 +474,18 @@ static void fill_header(char *buf, int len)
        hdr->hw_id = htonl(hw_id);
        hdr->hw_rev = htonl(hw_rev);
 
-       if (boot_info.file_size == 0)
-               memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
-       else
-               memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
-
        hdr->kernel_la = htonl(kernel_la);
        hdr->kernel_ep = htonl(kernel_ep);
-       hdr->fw_length = htonl(layout->fw_max_len);
        hdr->kernel_ofs = htonl(sizeof(struct fw_header));
        hdr->kernel_len = htonl(kernel_len);
+
        if (!combined) {
+               if (boot_info.file_size == 0)
+                       memcpy(hdr->md5sum1, md5salt_normal, sizeof(hdr->md5sum1));
+               else
+                       memcpy(hdr->md5sum1, md5salt_boot, sizeof(hdr->md5sum1));
+
+               hdr->fw_length = htonl(layout->fw_max_len);
                hdr->rootfs_ofs = htonl(rootfs_ofs);
                hdr->rootfs_len = htonl(rootfs_info.file_size);
        }
@@ -530,7 +511,8 @@ static void fill_header(char *buf, int len)
                hdr->kernel_ep = bswap_32(hdr->kernel_ep);
        }
 
-       get_md5(buf, len, hdr->md5sum1);
+       if (!combined)
+               get_md5(buf, len, hdr->md5sum1);
 }
 
 static int pad_jffs2(char *buf, int currlen)
@@ -607,7 +589,12 @@ static int build_fw(void)
        int ret = EXIT_FAILURE;
        int writelen = 0;
 
-       buflen = layout->fw_max_len;
+       writelen = sizeof(struct fw_header) + kernel_len;
+
+       if (combined)
+               buflen = writelen;
+       else
+               buflen = layout->fw_max_len;
 
        buf = malloc(buflen);
        if (!buf) {
@@ -621,7 +608,6 @@ static int build_fw(void)
        if (ret)
                goto out_free_buf;
 
-       writelen = sizeof(struct fw_header) + kernel_len;
 
        if (!combined) {
                if (rootfs_align)
@@ -814,7 +800,7 @@ int main(int argc, char *argv[])
        while ( 1 ) {
                int c;
 
-               c = getopt(argc, argv, "a:H:E:F:L:m:V:N:W:C:ci:k:r:R:o:xX:ehsSjv:");
+               c = getopt(argc, argv, "a:H:E:F:L:m:V:N:W:C:ci:k:r:R:o:xX:ehsjv:");
                if (c == -1)
                        break;
 
@@ -870,9 +856,6 @@ int main(int argc, char *argv[])
                case 's':
                        strip_padding = 1;
                        break;
-               case 'S':
-                       ignore_size = 1;
-                       break;
                case 'i':
                        inspect_info.file_name = optarg;
                        break;