1 files changed, 210 insertions, 0 deletions

diff --git a/tools/mknkboot.c b/tools/mknkboot.c
new file mode 100644
index 0000000000..c5e89f6834
--- /dev/null
+++ b/tools/mknkboot.c
@@ -0,0 +1,210 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2007 by Dave Chapman
+ *
+ * Based on merge0.cpp by James Espinoza, but completely rewritten.
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+/*
+
+Description of nk.bin from 
+
+http://www.xs4all.nl/~itsme/projects/xda/wince-flashfile-formats.html
+
+these files contain most information, several non-contigouos blocks
+may be present and an entrypoint in the code.
+
+   1. a 7 character signature "B000FF\n" ( that is with 3 zeroes, and
+      ending in a linefeed )
+   2. DWORD for image start
+   3. DWORD for image length
+   4. followd by several records of this format:
+         1. DWORD with address where this block is to be flashed to
+         2. DWORD with the length of this block
+         3. DWORD with the 32 bit checksum of this block, in perl:
+            unpack("%32C*", $data);
+         4. followed by <length> bytes of data 
+   5. the last record has address ZERO, in the length the entrypoint
+      into the rom, and ZERO as checksum.
+
+
+NOTE: The Gigabeat-S nk.bin contains 171 records, plus the EOF record.
+
+mknkboot.c appends two images:
+
+1) A "Disable" image which overwrites a word in the EBoot image
+2) Our bootloader image, which has the same load address as nk.exe
+
+*/
+
+/* win32 compatibility */
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+
+#define DISABLE_ADDR    0x88065A10 /* in EBoot */
+#define DISABLE_INSN    0xe3a00001
+#define DISABLE_SUM     (0xe3+0xa0+0x00+0x01)  
+
+static void put_uint32le(uint32_t x, unsigned char* p)
+{
+    p[0] = x & 0xff;
+    p[1] = (x >> 8) & 0xff;
+    p[2] = (x >> 16) & 0xff;
+    p[3] = (x >> 24) & 0xff;
+}
+
+static void usage(void)
+{
+    printf("Usage: mknkboot <firmware file> <boot file> <output file>\n");
+
+    exit(1);
+}
+
+static off_t filesize(int fd) {
+    struct stat buf;
+
+    if (fstat(fd,&buf) < 0) {
+        perror("[ERR]  Checking filesize of input file");
+        return -1;
+    } else {
+        return(buf.st_size);
+    }
+}
+
+
+int main(int argc, char *argv[])
+{
+    char *infile, *bootfile, *outfile;
+    int fdin, fdboot,fdout;
+    int i,n;
+    int inlength,bootlength,newlength;
+    unsigned char* buf;
+    unsigned char* boot;
+    unsigned char* disable;
+    uint32_t sum;
+    
+    if(argc < 3) {
+        usage();
+    }
+
+    infile = argv[1];
+    bootfile = argv[2];
+    outfile = argv[3];
+
+    fdin = open(infile, O_RDONLY|O_BINARY);
+    if (fdin < 0)
+    {
+        perror(infile);
+    }
+
+    fdboot = open(bootfile, O_RDONLY|O_BINARY);
+    if (fdboot < 0)
+    {
+        perror(bootfile);
+    }
+
+    inlength = filesize(fdin);
+
+    bootlength = filesize(fdboot);
+
+    /* Create buffer for original nk.bin, plus our bootloader (with 12
+       byte header), plus the 16-byte "disable record" */
+
+    newlength = inlength + (bootlength + 12) + 16;
+    buf = malloc(newlength);
+
+    if (buf==NULL)
+    {
+        printf("[ERR]  Could not allocate memory, aborting\n");
+        return 1;
+    }
+
+    /****** STEP 1 - Read original nk.bin into buffer */
+
+    n = read(fdin, buf, inlength);
+    if (n != inlength)
+    {
+        printf("[ERR] Could not read from %s\n",infile);
+        return 2;
+    }
+
+    /****** STEP 2 - Move EOF record to the new EOF */
+    memcpy(buf + newlength - 12, buf + inlength - 12, 12);
+
+
+    /****** STEP 3 - Create a record to disable the firmware signature
+                check in EBoot */
+    disable = buf + inlength - 12;
+
+    put_uint32le(DISABLE_ADDR, disable);
+    put_uint32le(4,            disable + 4);
+    put_uint32le(DISABLE_SUM,  disable + 8);
+    put_uint32le(DISABLE_INSN, disable + 12);
+
+    /****** STEP 4 - Read the bootloader binary */
+    boot = disable + 16;
+    n = read(fdboot, boot + 12, bootlength);
+    if (n != bootlength)
+    {
+        printf("[ERR] Could not read from %s\n",bootfile);
+        return 3;
+    }
+
+    /****** STEP 5 - Create header for bootloader record */
+
+    /* Calculate simple checksum */
+    sum = 0;
+    for (i = 0; i < bootlength; i++) {
+        sum += boot[12 + i];
+    }
+    
+    put_uint32le(0x88201000, boot); /* nk.exe start address */
+    put_uint32le(bootlength, boot + 4);
+    put_uint32le(sum, boot + 8);
+
+    /****** STEP 6 -  Now write the output file */
+
+    fdout = open(outfile, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0644);
+    if (fdout < 0)
+    {
+        perror(outfile);
+    }
+
+    n = write(fdout, buf, newlength);
+    if (n != newlength)
+    {
+        printf("[ERR] Could not write output file %s\n",outfile);
+        return 3;
+    }
+
+    close(fdin);
+    close(fdboot);
+    close(fdout);
+    
+    return 0;
+}