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firmware-utils/mktplinkfw: allow to align the rootfs on a specified boundary
[openwrt.git] / tools / firmware-utils / src / mktplinkfw.c
diff --git a/tools/firmware-utils/src/mktplinkfw.c b/tools/firmware-utils/src/mktplinkfw.c
index b9caa0e..0f1e20f 100644 (file)
--- a/tools/firmware-utils/src/mktplinkfw.c
+++ b/tools/firmware-utils/src/mktplinkfw.c
@@ -22,22 +22,28 @@
 #include <errno.h>
 #include <sys/stat.h>
 
 #include <errno.h>
 #include <sys/stat.h>
 
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
 #include "md5.h"
 
 #include "md5.h"
 
-#if (__BYTE_ORDER == __BIG_ENDIAN)
-#  define HOST_TO_BE32(x)      (x)
-#  define BE32_TO_HOST(x)      (x)
-#else
-#  define HOST_TO_BE32(x)      bswap_32(x)
-#  define BE32_TO_HOST(x)      bswap_32(x)
-#endif
+#define ALIGN(x,a) ({ typeof(a) __a = (a); (((x) + __a - 1) & ~(__a - 1)); })
 
 #define HEADER_VERSION_V1      0x01000000
 
 #define HEADER_VERSION_V1      0x01000000
+#define HWID_TL_MR3220_V1      0x32200001
+#define HWID_TL_MR3420_V1      0x34200001
 #define HWID_TL_WA901ND_V1     0x09010001
 #define HWID_TL_WA901ND_V1     0x09010001
+#define HWID_TL_WA901ND_V2     0x09010002
+#define HWID_TL_WR703N_V1      0x07030101
 #define HWID_TL_WR741ND_V1     0x07410001
 #define HWID_TL_WR741ND_V1     0x07410001
+#define HWID_TL_WR741ND_V4     0x07410004
+#define HWID_TL_WR740N_V1      0x07400001
+#define HWID_TL_WR740N_V3      0x07400003
+#define HWID_TL_WR743ND_V1     0x07430001
 #define HWID_TL_WR841N_V1_5    0x08410002
 #define HWID_TL_WR841ND_V3     0x08410003
 #define HWID_TL_WR841ND_V5     0x08410005
 #define HWID_TL_WR841N_V1_5    0x08410002
 #define HWID_TL_WR841ND_V3     0x08410003
 #define HWID_TL_WR841ND_V5     0x08410005
+#define HWID_TL_WR841ND_V7     0x08410007
 #define HWID_TL_WR941ND_V2     0x09410002
 #define HWID_TL_WR941ND_V4     0x09410004
 #define HWID_TL_WR1043ND_V1    0x10430001
 #define HWID_TL_WR941ND_V2     0x09410002
 #define HWID_TL_WR941ND_V4     0x09410004
 #define HWID_TL_WR1043ND_V1    0x10430001
@@ -95,8 +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 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 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;
 static struct file_info boot_info;
 static int combined;
 static int strip_padding;
@@ -116,6 +124,22 @@ char md5salt_boot[MD5SUM_LEN] = {
 
 static struct board_info boards[] = {
        {
 
 static struct board_info boards[] = {
        {
+               .id             = "TL-MR3220v1",
+               .hw_id          = HWID_TL_MR3220_V1,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x140000,
+       }, {
+               .id             = "TL-MR3420v1",
+               .hw_id          = HWID_TL_MR3420_V1,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x140000,
+       }, {
                .id             = "TL-WA901NDv1",
                .hw_id          = HWID_TL_WA901ND_V1,
                .hw_rev         = 1,
                .id             = "TL-WA901NDv1",
                .hw_id          = HWID_TL_WA901ND_V1,
                .hw_rev         = 1,
@@ -123,6 +147,14 @@ static struct board_info boards[] = {
                .kernel_la      = 0x80060000,
                .kernel_ep      = 0x80060000,
                .rootfs_ofs     = 0x140000,
                .kernel_la      = 0x80060000,
                .kernel_ep      = 0x80060000,
                .rootfs_ofs     = 0x140000,
+       }, {
+               .id             = "TL-WA901NDv2",
+               .hw_id          = HWID_TL_WA901ND_V2,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x140000,
        }, {
                .id             = "TL-WR741NDv1",
                .hw_id          = HWID_TL_WR741ND_V1,
        }, {
                .id             = "TL-WR741NDv1",
                .hw_id          = HWID_TL_WR741ND_V1,
@@ -131,6 +163,38 @@ static struct board_info boards[] = {
                .kernel_la      = 0x80060000,
                .kernel_ep      = 0x80060000,
                .rootfs_ofs     = 0x140000,
                .kernel_la      = 0x80060000,
                .kernel_ep      = 0x80060000,
                .rootfs_ofs     = 0x140000,
+       }, {
+               .id             = "TL-WR741NDv4",
+               .hw_id          = HWID_TL_WR741ND_V4,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x100000,
+       }, {
+               .id             = "TL-WR740Nv1",
+               .hw_id          = HWID_TL_WR740N_V1,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x140000,
+       }, {
+               .id             = "TL-WR740Nv3",
+               .hw_id          = HWID_TL_WR740N_V3,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x140000,
+       }, {
+               .id             = "TL-WR743NDv1",
+               .hw_id          = HWID_TL_WR743ND_V1,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x140000,
        }, {
                .id             = "TL-WR841Nv1.5",
                .hw_id          = HWID_TL_WR841N_V1_5,
        }, {
                .id             = "TL-WR841Nv1.5",
                .hw_id          = HWID_TL_WR841N_V1_5,
@@ -155,6 +219,14 @@ static struct board_info boards[] = {
                .kernel_la      = 0x80060000,
                .kernel_ep      = 0x80060000,
                .rootfs_ofs     = 0x140000,
                .kernel_la      = 0x80060000,
                .kernel_ep      = 0x80060000,
                .rootfs_ofs     = 0x140000,
+       }, {
+               .id             = "TL-WR841NDv7",
+               .hw_id          = HWID_TL_WR841ND_V7,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x140000,
        }, {
                .id             = "TL-WR941NDv2",
                .hw_id          = HWID_TL_WR941ND_V2,
        }, {
                .id             = "TL-WR941NDv2",
                .hw_id          = HWID_TL_WR941ND_V2,
@@ -179,6 +251,14 @@ static struct board_info boards[] = {
                .kernel_la      = 0x80060000,
                .kernel_ep      = 0x80060000,
                .rootfs_ofs     = 0x140000,
                .kernel_la      = 0x80060000,
                .kernel_ep      = 0x80060000,
                .rootfs_ofs     = 0x140000,
+       }, {
+               .id             = "TL-WR703Nv1",
+               .hw_id          = HWID_TL_WR703N_V1,
+               .hw_rev         = 1,
+               .fw_max_len     = 0x3c0000,
+               .kernel_la      = 0x80060000,
+               .kernel_ep      = 0x80060000,
+               .rootfs_ofs     = 0x100000,
        }, {
                /* terminating entry */
        }
        }, {
                /* terminating entry */
        }
@@ -248,6 +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"
 "  -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"
 "  -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"
@@ -355,6 +436,8 @@ static int check_options(void)
        if (ret)
                return ret;
 
        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)) {
        if (combined) {
                if (kernel_info.file_size >
                    board->fw_max_len - sizeof(struct fw_header)) {
@@ -362,11 +445,6 @@ static int check_options(void)
                        return -1;
                }
        } else {
                        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;
                if (rootfs_info.file_name == NULL) {
                        ERR("no rootfs image specified");
                        return -1;
@@ -376,10 +454,30 @@ static int check_options(void)
                if (ret)
                        return ret;
 
                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;
+                       }
                }
        }
 
                }
        }
 
@@ -397,25 +495,25 @@ static void fill_header(char *buf, int len)
 
        memset(hdr, 0, sizeof(struct fw_header));
 
 
        memset(hdr, 0, sizeof(struct fw_header));
 
-       hdr->version = HOST_TO_BE32(HEADER_VERSION_V1);
+       hdr->version = htonl(HEADER_VERSION_V1);
        strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
        strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
        strncpy(hdr->vendor_name, vendor, sizeof(hdr->vendor_name));
        strncpy(hdr->fw_version, version, sizeof(hdr->fw_version));
-       hdr->hw_id = HOST_TO_BE32(board->hw_id);
-       hdr->hw_rev = HOST_TO_BE32(board->hw_rev);
+       hdr->hw_id = htonl(board->hw_id);
+       hdr->hw_rev = htonl(board->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));
 
 
        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 = HOST_TO_BE32(kernel_la);
-       hdr->kernel_ep = HOST_TO_BE32(kernel_ep);
-       hdr->fw_length = HOST_TO_BE32(board->fw_max_len);
-       hdr->kernel_ofs = HOST_TO_BE32(sizeof(struct fw_header));
-       hdr->kernel_len = HOST_TO_BE32(kernel_info.file_size);
+       hdr->kernel_la = htonl(kernel_la);
+       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_len);
        if (!combined) {
        if (!combined) {
-               hdr->rootfs_ofs = HOST_TO_BE32(rootfs_ofs);
-               hdr->rootfs_len = HOST_TO_BE32(rootfs_info.file_size);
+               hdr->rootfs_ofs = htonl(rootfs_ofs);
+               hdr->rootfs_len = htonl(rootfs_info.file_size);
        }
 
        get_md5(buf, len, hdr->md5sum1);
        }
 
        get_md5(buf, len, hdr->md5sum1);
@@ -475,15 +573,21 @@ static int build_fw(void)
        if (ret)
                goto out_free_buf;
 
        if (ret)
                goto out_free_buf;
 
-       writelen = kernel_info.file_size;
+       writelen = sizeof(struct fw_header) + kernel_len;
 
        if (!combined) {
 
        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;
 
                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)
        }
 
        if (!strip_padding)
@@ -589,18 +693,18 @@ static int inspect_fw(void)
        inspect_fw_pstr("File name", inspect_info.file_name);
        inspect_fw_phexdec("File size", inspect_info.file_size);
 
        inspect_fw_pstr("File name", inspect_info.file_name);
        inspect_fw_phexdec("File size", inspect_info.file_size);
 
-       if (BE32_TO_HOST(hdr->version) != HEADER_VERSION_V1) {
+       if (ntohl(hdr->version) != HEADER_VERSION_V1) {
                ERR("file does not seem to have V1 header!\n");
                goto out_free_buf;
        }
 
        inspect_fw_phexdec("Version 1 Header size", sizeof(struct fw_header));
 
                ERR("file does not seem to have V1 header!\n");
                goto out_free_buf;
        }
 
        inspect_fw_phexdec("Version 1 Header size", sizeof(struct fw_header));
 
-       if (BE32_TO_HOST(hdr->unk1) != 0)
+       if (ntohl(hdr->unk1) != 0)
                inspect_fw_phexdec("Unknown value 1", hdr->unk1);
 
        memcpy(md5sum, hdr->md5sum1, sizeof(md5sum));
                inspect_fw_phexdec("Unknown value 1", hdr->unk1);
 
        memcpy(md5sum, hdr->md5sum1, sizeof(md5sum));
-       if (BE32_TO_HOST(hdr->boot_len) == 0)
+       if (ntohl(hdr->boot_len) == 0)
                memcpy(hdr->md5sum1, md5salt_normal, sizeof(md5sum));
        else
                memcpy(hdr->md5sum1, md5salt_boot, sizeof(md5sum));
                memcpy(hdr->md5sum1, md5salt_normal, sizeof(md5sum));
        else
                memcpy(hdr->md5sum1, md5salt_boot, sizeof(md5sum));
@@ -612,62 +716,62 @@ static int inspect_fw(void)
        } else {
                inspect_fw_pmd5sum("Header MD5Sum1", md5sum, "(ok)");
        }
        } else {
                inspect_fw_pmd5sum("Header MD5Sum1", md5sum, "(ok)");
        }
-       if (BE32_TO_HOST(hdr->unk2) != 0)
+       if (ntohl(hdr->unk2) != 0)
                inspect_fw_phexdec("Unknown value 2", hdr->unk2);
        inspect_fw_pmd5sum("Header MD5Sum2", hdr->md5sum2,
                           "(purpose yet unknown, unchecked here)");
                inspect_fw_phexdec("Unknown value 2", hdr->unk2);
        inspect_fw_pmd5sum("Header MD5Sum2", hdr->md5sum2,
                           "(purpose yet unknown, unchecked here)");
-       if (BE32_TO_HOST(hdr->unk3) != 0)
+       if (ntohl(hdr->unk3) != 0)
                inspect_fw_phexdec("Unknown value 3", hdr->unk3);
 
        printf("\n");
 
        inspect_fw_pstr("Vendor name", hdr->vendor_name);
        inspect_fw_pstr("Firmware version", hdr->fw_version);
                inspect_fw_phexdec("Unknown value 3", hdr->unk3);
 
        printf("\n");
 
        inspect_fw_pstr("Vendor name", hdr->vendor_name);
        inspect_fw_pstr("Firmware version", hdr->fw_version);
-       board = find_board_by_hwid(BE32_TO_HOST(hdr->hw_id));
+       board = find_board_by_hwid(ntohl(hdr->hw_id));
        if (board) {
                inspect_fw_phexpost("Hardware ID",
        if (board) {
                inspect_fw_phexpost("Hardware ID",
-                                   BE32_TO_HOST(hdr->hw_id), board->id);
+                                   ntohl(hdr->hw_id), board->id);
                inspect_fw_phexexp("Hardware Revision",
                inspect_fw_phexexp("Hardware Revision",
-                                  BE32_TO_HOST(hdr->hw_rev), board->hw_rev);
+                                  ntohl(hdr->hw_rev), board->hw_rev);
        } else {
                inspect_fw_phexpost("Hardware ID",
        } else {
                inspect_fw_phexpost("Hardware ID",
-                                   BE32_TO_HOST(hdr->hw_id), "unknown");
+                                   ntohl(hdr->hw_id), "unknown");
                inspect_fw_phex("Hardware Revision",
                inspect_fw_phex("Hardware Revision",
-                               BE32_TO_HOST(hdr->hw_rev));
+                               ntohl(hdr->hw_rev));
        }
 
        printf("\n");
 
        inspect_fw_phexdec("Kernel data offset",
        }
 
        printf("\n");
 
        inspect_fw_phexdec("Kernel data offset",
-                          BE32_TO_HOST(hdr->kernel_ofs));
+                          ntohl(hdr->kernel_ofs));
        inspect_fw_phexdec("Kernel data length",
        inspect_fw_phexdec("Kernel data length",
-                          BE32_TO_HOST(hdr->kernel_len));
+                          ntohl(hdr->kernel_len));
        if (board) {
                inspect_fw_phexdef("Kernel load address",
        if (board) {
                inspect_fw_phexdef("Kernel load address",
-                                  BE32_TO_HOST(hdr->kernel_la),
+                                  ntohl(hdr->kernel_la),
                                   board->kernel_la);
                inspect_fw_phexdef("Kernel entry point",
                                   board->kernel_la);
                inspect_fw_phexdef("Kernel entry point",
-                                  BE32_TO_HOST(hdr->kernel_ep),
+                                  ntohl(hdr->kernel_ep),
                                   board->kernel_ep);
                inspect_fw_phexdecdef("Rootfs data offset",
                                   board->kernel_ep);
                inspect_fw_phexdecdef("Rootfs data offset",
-                                     BE32_TO_HOST(hdr->rootfs_ofs),
+                                     ntohl(hdr->rootfs_ofs),
                                      board->rootfs_ofs);
        } else {
                inspect_fw_phex("Kernel load address",
                                      board->rootfs_ofs);
        } else {
                inspect_fw_phex("Kernel load address",
-                               BE32_TO_HOST(hdr->kernel_la));
+                               ntohl(hdr->kernel_la));
                inspect_fw_phex("Kernel entry point",
                inspect_fw_phex("Kernel entry point",
-                               BE32_TO_HOST(hdr->kernel_ep));
+                               ntohl(hdr->kernel_ep));
                inspect_fw_phexdec("Rootfs data offset",
                inspect_fw_phexdec("Rootfs data offset",
-                                  BE32_TO_HOST(hdr->rootfs_ofs));
+                                  ntohl(hdr->rootfs_ofs));
        }
        inspect_fw_phexdec("Rootfs data length",
        }
        inspect_fw_phexdec("Rootfs data length",
-                          BE32_TO_HOST(hdr->rootfs_len));
+                          ntohl(hdr->rootfs_len));
        inspect_fw_phexdec("Boot loader data offset",
        inspect_fw_phexdec("Boot loader data offset",
-                          BE32_TO_HOST(hdr->boot_ofs));
+                          ntohl(hdr->boot_ofs));
        inspect_fw_phexdec("Boot loader data length",
        inspect_fw_phexdec("Boot loader data length",
-                          BE32_TO_HOST(hdr->boot_len));
+                          ntohl(hdr->boot_len));
        inspect_fw_phexdec("Total firmware length",
        inspect_fw_phexdec("Total firmware length",
-                          BE32_TO_HOST(hdr->fw_length));
+                          ntohl(hdr->fw_length));
 
        if (extract) {
                FILE *fp;
 
        if (extract) {
                FILE *fp;
@@ -680,8 +784,8 @@ static int inspect_fw(void)
                printf("Extracting kernel to \"%s\"...\n", filename);
                fp = fopen(filename, "w");
                if (fp) {
                printf("Extracting kernel to \"%s\"...\n", filename);
                fp = fopen(filename, "w");
                if (fp) {
-                       if (!fwrite(buf + BE32_TO_HOST(hdr->kernel_ofs),
-                                   BE32_TO_HOST(hdr->kernel_len), 1, fp)) {
+                       if (!fwrite(buf + ntohl(hdr->kernel_ofs),
+                                   ntohl(hdr->kernel_len), 1, fp)) {
                                ERR("error in fwrite(): %s", strerror(errno));
                        }
                        fclose(fp);
                                ERR("error in fwrite(): %s", strerror(errno));
                        }
                        fclose(fp);
@@ -695,8 +799,8 @@ static int inspect_fw(void)
                printf("Extracting rootfs to \"%s\"...\n", filename);
                fp = fopen(filename, "w");
                if (fp) {
                printf("Extracting rootfs to \"%s\"...\n", filename);
                fp = fopen(filename, "w");
                if (fp) {
-                       if (!fwrite(buf + BE32_TO_HOST(hdr->rootfs_ofs),
-                                   BE32_TO_HOST(hdr->rootfs_len), 1, fp)) {
+                       if (!fwrite(buf + ntohl(hdr->rootfs_ofs),
+                                   ntohl(hdr->rootfs_len), 1, fp)) {
                                ERR("error in fwrite(): %s", strerror(errno));
                        }
                        fclose(fp);
                                ERR("error in fwrite(): %s", strerror(errno));
                        }
                        fclose(fp);
@@ -724,11 +828,14 @@ int main(int argc, char *argv[])
        while ( 1 ) {
                int c;
 
        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) {
                if (c == -1)
                        break;
 
                switch (c) {
+               case 'a':
+                       sscanf(optarg, "0x%x", &rootfs_align);
+                       break;
                case 'B':
                        board_id = optarg;
                        break;
                case 'B':
                        board_id = optarg;
                        break;
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