firmware-utils/mktplinkfw: allow to align the rootfs on a specified boundary

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29445 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/tools/firmware-utils/src/mktplinkfw.c b/tools/firmware-utils/src/mktplinkfw.c
index a1669ce..0f1e20f 100644 (file)
--- a/tools/firmware-utils/src/mktplinkfw.c
+++ b/tools/firmware-utils/src/mktplinkfw.c
@@ -27,6 +27,8 @@
 
 #include "md5.h"
 
+#define ALIGN(x,a) ({ typeof(a) __a = (a); (((x) + __a - 1) & ~(__a - 1)); })
+
 #define HEADER_VERSION_V1      0x01000000
 #define HWID_TL_MR3220_V1      0x32200001
 #define HWID_TL_MR3420_V1      0x34200001
@@ -99,8 +101,10 @@ static struct board_info *board;
 static struct file_info kernel_info;
 static uint32_t kernel_la = 0;
 static uint32_t kernel_ep = 0;
+static uint32_t kernel_len = 0;
 static struct file_info rootfs_info;
 static uint32_t rootfs_ofs = 0;
+static uint32_t rootfs_align;
 static struct file_info boot_info;
 static int combined;
 static int strip_padding;
@@ -324,6 +328,7 @@ static void usage(int status)
 "  -L <la>         overwrite kernel load address with <la> (hexval prefixed with 0x)\n"
 "  -k <file>       read kernel image from the file <file>\n"
 "  -r <file>       read rootfs image from the file <file>\n"
+"  -a <align>      align the rootfs start on an <align> bytes boundary\n"
 "  -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"
@@ -431,6 +436,8 @@ static int check_options(void)
        if (ret)
                return ret;
 
+       kernel_len = kernel_info.file_size;
+
        if (combined) {
                if (kernel_info.file_size >
                    board->fw_max_len - sizeof(struct fw_header)) {
@@ -438,11 +445,6 @@ static int check_options(void)
                        return -1;
                }
        } else {
-               if (kernel_info.file_size >
-                   rootfs_ofs - sizeof(struct fw_header)) {
-                       ERR("kernel image is too big");
-                       return -1;
-               }
                if (rootfs_info.file_name == NULL) {
                        ERR("no rootfs image specified");
                        return -1;
@@ -452,10 +454,30 @@ static int check_options(void)
                if (ret)
                        return ret;
 
-               if (rootfs_info.file_size >
-                    (board->fw_max_len - rootfs_ofs)) {
-                       ERR("rootfs image is too big");
-                       return -1;
+               if (rootfs_align) {
+                       kernel_len += sizeof(struct fw_header);
+                       kernel_len = ALIGN(kernel_len, rootfs_align);
+                       kernel_len -= sizeof(struct fw_header);
+
+                       DBG("kernel length aligned to %u", kernel_len);
+
+                       if (kernel_len + rootfs_info.file_size >
+                           board->fw_max_len - sizeof(struct fw_header)) {
+                               ERR("images are too big");
+                               return -1;
+                       }
+               } else {
+                       if (kernel_info.file_size >
+                           rootfs_ofs - sizeof(struct fw_header)) {
+                               ERR("kernel image is too big");
+                               return -1;
+                       }
+
+                       if (rootfs_info.file_size >
+                           (board->fw_max_len - rootfs_ofs)) {
+                               ERR("rootfs image is too big");
+                               return -1;
+                       }
                }
        }
 
@@ -488,7 +510,7 @@ static void fill_header(char *buf, int len)
        hdr->kernel_ep = htonl(kernel_ep);
        hdr->fw_length = htonl(board->fw_max_len);
        hdr->kernel_ofs = htonl(sizeof(struct fw_header));
-       hdr->kernel_len = htonl(kernel_info.file_size);
+       hdr->kernel_len = htonl(kernel_len);
        if (!combined) {
                hdr->rootfs_ofs = htonl(rootfs_ofs);
                hdr->rootfs_len = htonl(rootfs_info.file_size);
@@ -551,15 +573,21 @@ static int build_fw(void)
        if (ret)
                goto out_free_buf;
 
-       writelen = sizeof(struct fw_header) + kernel_info.file_size;
+       writelen = sizeof(struct fw_header) + kernel_len;
 
        if (!combined) {
-               p = buf + rootfs_ofs;
+               if (rootfs_align)
+                       p = buf + writelen;
+               else
+                       p = buf + rootfs_ofs;
                ret = read_to_buf(&rootfs_info, p);
                if (ret)
                        goto out_free_buf;
 
-               writelen = rootfs_ofs + rootfs_info.file_size;
+               if (rootfs_align)
+                       writelen += rootfs_info.file_size;
+               else
+                       writelen = rootfs_ofs + rootfs_info.file_size;
        }
 
        if (!strip_padding)
@@ -800,11 +828,14 @@ int main(int argc, char *argv[])
        while ( 1 ) {
                int c;
 
-               c = getopt(argc, argv, "B:E:L:V:N:ci:k:r:R:o:xhs");
+               c = getopt(argc, argv, "a:B:E:L:V:N:ci:k:r:R:o:xhs");
                if (c == -1)
                        break;
 
                switch (c) {
+               case 'a':
+                       sscanf(optarg, "0x%x", &rootfs_align);
+                       break;
                case 'B':
                        board_id = optarg;
                        break;