Add flashsplit utility, previously hosted on the wiki at http://www.rockbox.org/wiki/IpodFlash

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21844 a1c6a512-1295-4272-9138-f99709370657

utils/ipod/flashsplit/Makefile

@@ -0,0 +1,16 @@
+#             __________               __   ___.
+#   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+#   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+#   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+#   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+#                     \/            \/     \/    \/            \/
+# $Id$
+#
+
+all: flashsplit
+
+flashsplit: flashsplit.c
+	gcc -W -Wall -o flashsplit flashsplit.c
+
+clean:
+	rm -f flashsplit

utils/ipod/flashsplit/README

@@ -0,0 +1,8 @@
+flashsplit
+----------
+
+A simple utility to split a dump of the NOR flash on an ipod.
+
+Should work on all PortalPlayer-based ipods.
+
+See http://www.rockbox.org/wiki/IpodFlash for more information.

utils/ipod/flashsplit/flashsplit.c

@@ -0,0 +1,230 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2007 Dave Chapman
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+static void int2be(unsigned int val, unsigned char* addr)
+{
+    addr[0] = (val >> 24) & 0xff;
+    addr[1] = (val >> 16) & 0xff;
+    addr[2] = (val >> 8) & 0xff;
+    addr[3] = val & 0xFF;
+}
+
+static int le2int(unsigned char* buf)
+{
+   int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+
+   return res;
+}
+
+static char* get_modelname(int version)
+{
+
+    switch (version >> 8) {
+        case 0x01:
+            return "1g2g";
+            break;
+        case 0x02:
+            return "ip3g";
+            break;
+        case 0x40:
+            return "mini";
+            break;
+        case 0x50:
+            return "ip4g";
+            break;
+        case 0x60:
+            return "ipco";
+            break;
+        case 0x70:
+            return "mn2g";
+            break;
+        case 0xc0:
+            return "nano";
+            break;
+        case 0xb0:
+            return "ipvd";
+            break;
+    }
+
+    return NULL;
+}
+
+static int get_modelnum(int version)
+{
+
+    switch (version >> 8) {
+        case 0x01:
+            return 19; // "1g2g";
+            break;
+        case 0x02:
+            return 7; // "ip3g";
+            break;
+        case 0x40:
+            return 9; // "mini";
+            break;
+        case 0x50:
+            return 8; // "ip4g";
+            break;
+        case 0x60:
+            return 3; // "ipco";
+            break;
+        case 0x70:
+            return 11; // "mn2g";
+            break;
+        case 0xc0:
+            return 4;  // "nano";
+            break;
+        case 0xb0:
+            return 5;  // "ipvd";
+            break;
+    }
+
+    return -1;
+}
+
+
+static void dump_app(char* name, unsigned char* p, unsigned char* flash)
+{
+    char filename[64];
+    unsigned char header[8];
+    unsigned int i;
+    unsigned int sum;
+    int outfile;
+
+    unsigned int unknown1;
+    unsigned int offset;
+    unsigned int length;
+    unsigned int loadaddr;
+    unsigned int unknown2;
+    unsigned int checksum;
+    unsigned int version;
+    unsigned int unknown3;
+    char* modelname;
+
+    /* Extract variables from header */
+    unknown1 = le2int(p+0x08);
+    offset   = le2int(p+0x0c);
+    length   = le2int(p+0x10);
+    loadaddr = le2int(p+0x14);
+    unknown2 = le2int(p+0x18);
+    checksum = le2int(p+0x1c);
+    version  = le2int(p+0x20);
+    unknown3 = le2int(p+0x24);
+
+    modelname = get_modelname(version);
+    sum = 0; 
+
+    for (i = offset; i < offset+length ; i++) { 
+        sum += flash[i];
+    }
+
+    /* Display information: */
+    printf("Image: %s\n",name);
+    printf("unknown1: %08x\n",unknown1);
+    printf("offset:   %08x\n",offset);
+    printf("length:   %08x\n",length);
+    printf("loadaddr: %08x\n",loadaddr);
+    printf("unknown2: %08x\n",unknown2);
+    printf("checksum: %08x  (flashsplit sum: %08x)\n",checksum,sum);
+    printf("version:  %08x  (ipod model: %s)\n",version,modelname);
+    printf("unknown3: %08x\n",unknown3);
+    printf("\n");
+
+    if (modelname == NULL) { 
+        printf("Unknown version, not exporting to .ipod file\n");
+        return;
+    } else if (checksum != sum) {
+        printf("Checksum mismatch, not exporting to .ipod file\n");
+    } else {
+        sum += get_modelnum(version);
+        int2be(sum,header);
+        memcpy(header+4,modelname,4);
+
+        sprintf(filename,"%s.ipod",name);
+        outfile = open(filename,O_CREAT|O_TRUNC|O_WRONLY,0666);
+        if (outfile < 0) {
+            fprintf(stderr,"[ERR]  Couldn't open file %s\n",filename);
+            return;
+        }
+
+        write(outfile,header,8);
+        write(outfile,flash+offset,length);
+        close(outfile);
+    }
+
+    sprintf(filename,"%s.bin",name);
+    outfile = open(filename,O_CREAT|O_TRUNC|O_WRONLY,0666);
+    if (outfile < 0) {
+        fprintf(stderr,"[ERR]  Couldn't open file %s\n",filename);
+        return;
+    }
+
+    write(outfile,flash+offset,length);
+    close(outfile);
+}
+
+int main(int argc,char* argv[])
+{
+  int fd;
+  unsigned char buf[1024*1024];
+  unsigned char* p;
+
+  if (argc != 2) {
+      fprintf(stderr,"Usage: flashsplit flash.bin\n");
+      return 1;
+  }
+
+  fd=open(argv[1],O_RDONLY);
+  if (fd < 0) {
+      fprintf(stderr,"Can not open %s\n",argv[1]);
+      return 1;
+  }
+
+  read(fd,buf,sizeof(buf));
+  close(fd);
+
+
+  p = buf + 0xffe00; /* Start of flash directory */
+
+  while (le2int(p) != 0) {
+      if (memcmp(p,"hslfksid",8)==0) {
+          dump_app("diskmode",p,buf);
+      } else if (memcmp(p,"hslfgaid",8)==0) {
+          dump_app("diagmode",p,buf);
+      } else if (memcmp(p,"hslfogol",8)==0) {
+          dump_app("logo",p,buf);
+      } else if (memcmp(p,"hslfnacs",8)==0) {
+          dump_app("diskscan",p,buf);
+      } else if (memcmp(p,"hslfscmv",8)==0) {
+          dump_app("vmcs",p,buf);
+      } else {
+          printf("Unknown image type - %c%c%c%c%c%c%c%c\n",p[3],p[2],p[1],p[0],p[7],p[6],p[5],p[4]);
+      }
+      p += 0x28;
+  }
+
+  return 0;
+}