diff --git a/mkbootimg/mkbootimg.c b/mkbootimg/mkbootimg.c
new file mode 100644
index 0000000..d803cf6
--- /dev/null
+++ b/mkbootimg/mkbootimg.c
@@ -0,0 +1,251 @@
+/* tools/mkbootimg/mkbootimg.c
+**
+** Copyright 2007, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "mincrypt/sha.h"
+#include "bootimg.h"
+
+static void *load_file(const char *fn, unsigned *_sz)
+{
+    char *data;
+    int sz;
+    int fd;
+
+    data = 0;
+    fd = open(fn, O_RDONLY);
+    if(fd < 0) return 0;
+
+    sz = lseek(fd, 0, SEEK_END);
+    if(sz < 0) goto oops;
+
+    if(lseek(fd, 0, SEEK_SET) != 0) goto oops;
+
+    data = (char*) malloc(sz);
+    if(data == 0) goto oops;
+
+    if(read(fd, data, sz) != sz) goto oops;
+    close(fd);
+
+    if(_sz) *_sz = sz;
+    return data;
+
+oops:
+    close(fd);
+    if(data != 0) free(data);
+    return 0;
+}
+
+int usage(void)
+{
+    fprintf(stderr,"usage: mkbootimg\n"
+            "       --kernel <filename>\n"
+            "       --ramdisk <filename>\n"
+            "       [ --second <2ndbootloader-filename> ]\n"
+            "       [ --cmdline <kernel-commandline> ]\n"
+            "       [ --board <boardname> ]\n"
+            "       -o|--output <filename>\n"
+            );
+    return 1;
+}
+
+
+
+static unsigned char padding[2048] = { 0, };
+
+int write_padding(int fd, unsigned pagesize, unsigned itemsize)
+{
+    unsigned pagemask = pagesize - 1;
+    unsigned count;
+
+    if((itemsize & pagemask) == 0) {
+        return 0;
+    }
+
+    count = pagesize - (itemsize & pagemask);
+
+    if(write(fd, padding, count) != count) {
+        return -1;
+    } else {
+        return 0;
+    }
+}
+
+int main(int argc, char **argv)
+{
+    boot_img_hdr hdr;
+
+    char *kernel_fn = 0;
+    void *kernel_data = 0;
+    char *ramdisk_fn = 0;
+    void *ramdisk_data = 0;
+    char *second_fn = 0;
+    void *second_data = 0;
+    char *cmdline = "";
+    char *bootimg = 0;
+    char *board = "";
+    unsigned pagesize = 2048;
+    unsigned saddr = 0;
+    int fd;
+    SHA_CTX ctx;
+    uint8_t* sha;
+
+    argc--;
+    argv++;
+
+    memset(&hdr, 0, sizeof(hdr));
+
+    while(argc > 0){
+        char *arg = argv[0];
+        char *val = argv[1];
+        if(argc < 2) {
+            return usage();
+        }
+        argc -= 2;
+        argv += 2;
+        if(!strcmp(arg, "--output") || !strcmp(arg, "-o")) {
+            bootimg = val;
+        } else if(!strcmp(arg, "--kernel")) {
+            kernel_fn = val;
+        } else if(!strcmp(arg, "--ramdisk")) {
+            ramdisk_fn = val;
+        } else if(!strcmp(arg, "--second")) {
+            second_fn = val;
+        } else if(!strcmp(arg, "--cmdline")) {
+            cmdline = val;
+        } else if(!strcmp(arg, "--saddr")) {
+            saddr = strtoul(val, 0, 16);
+        } else if(!strcmp(arg, "--board")) {
+            board = val;
+        } else {
+            return usage();
+        }
+    }
+
+    if(bootimg == 0) {
+        fprintf(stderr,"error: no output filename specified\n");
+        return usage();
+    }
+
+    if(kernel_fn == 0) {
+        fprintf(stderr,"error: no kernel image specified\n");
+        return usage();
+    }
+
+    if(ramdisk_fn == 0) {
+        fprintf(stderr,"error: no ramdisk image specified\n");
+        return usage();
+    }
+
+    if(strlen(board) >= BOOT_NAME_SIZE) {
+        fprintf(stderr,"error: board name too large\n");
+        return usage();
+    }
+
+    strcpy(hdr.name, board);
+
+    hdr.kernel_addr =  0x10008000;
+    hdr.ramdisk_addr = 0x11000000;
+    if(saddr) {
+        hdr.second_addr =  0x00300000;
+    } else {
+        hdr.second_addr =  0x10F00000;
+    }
+    hdr.tags_addr   =  0x10000100;
+    hdr.page_size = pagesize;
+
+    memcpy(hdr.magic, BOOT_MAGIC, BOOT_MAGIC_SIZE);
+
+    if(strlen(cmdline) > (BOOT_ARGS_SIZE - 1)) {
+        fprintf(stderr,"error: kernel commandline too large\n");
+        return 1;
+    }
+    strcpy((char*)hdr.cmdline, cmdline);
+
+    kernel_data = load_file(kernel_fn, &hdr.kernel_size);
+    if(kernel_data == 0) {
+        fprintf(stderr,"error: could not load kernel '%s'\n", kernel_fn);
+        return 1;
+    }
+
+    if(!strcmp(ramdisk_fn,"NONE")) {
+        ramdisk_data = 0;
+        hdr.ramdisk_size = 0;
+    } else {
+        ramdisk_data = load_file(ramdisk_fn, &hdr.ramdisk_size);
+        if(ramdisk_data == 0) {
+            fprintf(stderr,"error: could not load ramdisk '%s'\n", ramdisk_fn);
+            return 1;
+        }
+    }
+
+    if(second_fn) {
+        second_data = load_file(second_fn, &hdr.second_size);
+        if(second_data == 0) {
+            fprintf(stderr,"error: could not load secondstage '%s'\n", second_fn);
+            return 1;
+        }
+    }
+
+    /* put a hash of the contents in the header so boot images can be
+     * differentiated based on their first 2k.
+     */
+    SHA_init(&ctx);
+    SHA_update(&ctx, kernel_data, hdr.kernel_size);
+    SHA_update(&ctx, &hdr.kernel_size, sizeof(hdr.kernel_size));
+    SHA_update(&ctx, ramdisk_data, hdr.ramdisk_size);
+    SHA_update(&ctx, &hdr.ramdisk_size, sizeof(hdr.ramdisk_size));
+    SHA_update(&ctx, second_data, hdr.second_size);
+    SHA_update(&ctx, &hdr.second_size, sizeof(hdr.second_size));
+    sha = SHA_final(&ctx);
+    memcpy(hdr.id, sha,
+           SHA_DIGEST_SIZE > sizeof(hdr.id) ? sizeof(hdr.id) : SHA_DIGEST_SIZE);
+
+    fd = open(bootimg, O_CREAT | O_TRUNC | O_WRONLY, 0644);
+    if(fd < 0) {
+        fprintf(stderr,"error: could not create '%s'\n", bootimg);
+        return 1;
+    }
+
+    if(write(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) goto fail;
+    if(write_padding(fd, pagesize, sizeof(hdr))) goto fail;
+
+    if(write(fd, kernel_data, hdr.kernel_size) != hdr.kernel_size) goto fail;
+    if(write_padding(fd, pagesize, hdr.kernel_size)) goto fail;
+
+    if(write(fd, ramdisk_data, hdr.ramdisk_size) != hdr.ramdisk_size) goto fail;
+    if(write_padding(fd, pagesize, hdr.ramdisk_size)) goto fail;
+
+    if(second_data) {
+        if(write(fd, second_data, hdr.second_size) != hdr.second_size) goto fail;
+        if(write_padding(fd, pagesize, hdr.ramdisk_size)) goto fail;
+    }
+
+    return 0;
+
+fail:
+    unlink(bootimg);
+    close(fd);
+    fprintf(stderr,"error: failed writing '%s': %s\n", bootimg,
+            strerror(errno));
+    return 1;
+}