Scramble can now generate an nk.bin file, independent of the OF. These nk.bin files will only transfer using the sendfirm tool.

Also made the gigabeats.c file 64-bit and endian safe.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15838 a1c6a512-1295-4272-9138-f99709370657

tools/gigabeats.c

@@ -19,6 +19,12 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+
+/* Entry point (and load address) for the main Rockbox bootloader */
+#define BL_ENTRY_POINT 0x8a000000
+
 
 static FILE * openinfile( const char * filename )
 {
@@ -44,128 +50,76 @@ static FILE * openoutfile( const char * filename )
     return F;
 };
 
-unsigned long calc_csum(const unsigned char* pb, int cb)
+static uint32_t calc_csum(const unsigned char* pb, int cb)
 {
-    unsigned long l = 0;
+    uint32_t l = 0;
     while (cb--)
         l += *pb++;
     return l;
 }
 
+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;
+}
+
 int gigabeat_s_code(char *infile, char *outfile)
 {
     FILE *in, *out;
-    unsigned long size = 0;
-    unsigned long data;
-    int imagelength;
+    unsigned int size;
+    unsigned int newsize;
+    unsigned char* buf;
 
     in = openinfile(infile);
     out = openoutfile(outfile);
 
+    /* Step 1: Load the binary file into memory */
     fseek(in, 0, SEEK_END);
     size = ftell(in);
-    fseek(in, 0, SEEK_SET);
-    unsigned long *binptr = malloc(size);
-    if(binptr == NULL) {
+
+    /* 15 bytes for header, 16 for signature bypass, 
+     * 12 for record header, 12 for footer */
+    newsize = 15 + 16 + 12 + size + 12;
+    buf = malloc(newsize);
+    if(buf == NULL) {
         fprintf(stderr, "Not enough memory to perform the requested operation. Aborting.\n" );
         return 0;
     }
-    fread(binptr, size/4, 4, in);
-    /* 15 bytes for header, three 12 byte headers, the data for the first three
-     * records, 12 byte header for code, code and the 12 byte footer
-     * However, the original nk.bin's length doesn't correspond with
-     * the length of the file, so I don't know what's up...
-     */
+    fseek(in, 0, SEEK_SET);
+    fread(buf + 43, size, 1, in);
+    fclose(in);
 
-    unsigned long header[2];
-    header[0] = 0x88200000;
-    /* header[1] = 15 + 12 + 4 + 12 + 8 + 12 + 4 + 12 + size + 12; */
-    header[1] = 0xCC0CD8; /* The bootloader checks this value and compares */
-    fwrite("B000FF\n", 7, 1, out);
-    fwrite(header, sizeof(header), 1, out);
-    
-    unsigned long record[4];
-    unsigned long extra;
+    /* Step 2: Create the file header */
+    sprintf(buf, "B000FF\n");
+    put_uint32le(0x88200000, buf+7);
+    /* If the value below is too small, the update will attempt to flash.
+     * Be careful when changing this (leaving it as is won't cause issues) */
+    put_uint32le(0xCC0CD8, buf+11); 
 
-    /*First record*/
-    record[0] = 0x88200000;
-    record[1] = 4;
-    record[2] = 0x1eb;
-    record[3] = 0xEA0003FE;
-    fwrite(record, sizeof(record), 1, out);
+    /* Step 3: Add the signature bypass record */
+    put_uint32le(0x88065A10, buf+15);
+    put_uint32le(4, buf+19);
+    put_uint32le(0xE3A00001, buf+27);
+    put_uint32le(calc_csum(buf+27,4), buf+23);
 
-    /*Second record*/
-    record[0] = 0x88200040;
-    record[1] = 8;
-    record[2] = 0x3e9;
-    record[3] = 0x43454345;
-    extra = 0x88EBF274;
-    fwrite(record, sizeof(record), 1, out);
-    fwrite(&extra, sizeof(extra), 1, out);
+    /* Step 4: Create a record for the actual code */
+    put_uint32le(BL_ENTRY_POINT, buf+31);
+    put_uint32le(size, buf+35);
+    put_uint32le(calc_csum(buf + 43, size), buf+39);
 
-    /*Third record*/
-    record[0] = 0x88200048;
-    record[1] = 4;
-    record[2] = 0x231;
-    record[3] = 0x00CBF274;
-    fwrite(record, sizeof(record), 1, out);
+    /* Step 5: Write the footer */
+    put_uint32le(0, buf+newsize-12);
+    put_uint32le(BL_ENTRY_POINT, buf+newsize-8);
+    put_uint32le(0, buf+newsize-4);
 
-    /*Signature bypass record*/
-    unsigned long magic = 0xE3A00001;
-    record[0] = 0x88065A10;
-    record[1] = 4;
-    record[2] = calc_csum((unsigned char*)&magic,4);
-    record[3] = magic;
-    fwrite(record, sizeof(record), 1, out);
-
-    /*The actual code*/
-    header[0] = 0x88201000;
-    header[1] = size;
-    extra = calc_csum((unsigned char*)binptr, size);
-    fwrite(header, sizeof(header), 1, out);
-    fwrite(&extra, sizeof(extra), 1, out);
-    fwrite(binptr, size, 1, out);
-
-    /* Table of contents. It's a start, but it still won't boot.
-     * Looks like it needs the file/module info as well... */
-    binptr[0] = 0x02000000;
-    binptr[1] = 0x02000000;
-    binptr[2] = 0x88040000;
-    binptr[3] = 0x88076338;
-    binptr[4] = 0x1;
-    binptr[5] = 0x88080000;
-    binptr[6] = 0x8809C000;
-    binptr[7] = 0x88100000;
-    binptr[8] = 0x0;
-    binptr[9] = 0x0;
-    binptr[10] = 0x0;
-    binptr[11] = 0x0;
-    binptr[12] = 0x0;
-    binptr[13] = 0x0;
-    binptr[14] = 0x80808080;
-    binptr[15] = 0x0;
-    binptr[16] = 0x0;
-    binptr[17] = 0x201C2;
-    binptr[18] = 0x88050940;
-    binptr[19] = 0x0;
-    binptr[20] = 0x0;
-    header[0] = 0x88EBF274;
-    header[1] = 0x54;
-    extra = calc_csum((unsigned char*)binptr, 84);
-    fwrite(header, sizeof(header), 1, out);
-    fwrite(&extra, sizeof(extra), 1, out);
-    fwrite(binptr, 84, 1, out);
-
-    /*The footer*/
-    header[0] = 0;
-    header[1] = 0x88201000;
-    extra = 0;
-    fwrite(header, sizeof(header), 1, out);
-    fwrite(&extra, sizeof(extra), 1, out);
+    /* Step 6: Write the resulting file */
+    fwrite(buf, newsize, 1, out);
+    fclose(out);
     
     fprintf(stderr, "File processed successfully\n" );
 
-    fclose(in);
-    fclose(out);
     return(0);
 }