Kill some D2 yellows with a simplistic Rolo implementation and NAND driver cleanup. Correct some comments in crt0.s and remove two erroneous null words from rockbox.bin

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17127 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/tcc780x/ata-nand-tcc780x.c

@@ -39,9 +39,6 @@ long last_disk_activity = -1;
 /** static, private data **/
 static bool initialized = false;
 
-static long next_yield = 0;
-#define MIN_YIELD_PERIOD 2000
-
 static struct mutex ata_mtx SHAREDBSS_ATTR;
 
 #define SECTOR_SIZE 512
@@ -740,7 +737,11 @@ int ata_read_sectors(IF_MV2(int drive,) unsigned long start, int incount,
 int ata_write_sectors(IF_MV2(int drive,) unsigned long start, int count,
                       const void* outbuf)
 {
-    #warning function not implemented
+#ifdef HAVE_MULTIVOLUME
+    (void)drive; /* unused for now */
+#endif
+
+    /* TODO: Learn more about TNFTL and implement this one day... */
     (void)start;
     (void)count;
     (void)outbuf;

firmware/target/arm/tcc780x/crt0.S

@@ -35,18 +35,16 @@
 
 start:
 #ifdef TCCBOOT
+#ifdef BOOTLOADER
     /* Add -DTCCBOOT to EXTRA_DEFINES in the bootloader Makefile to
        enable building the bootloader to be appended to the end of the
        original firmware, dual-booting based on a key-press.
 
-       NB: On the D2 TCCBOOT currently only works in USB boot mode (via tcctool)
-       When flashed to the device, the OF will boot as normal - but holding a
-       key to boot Rockbox results in a blank screen and crashed player.
-
        The following two values are filled in by mktccboot.
      */
     .word  0              /* Saved entrypoint of original firmware*/
     .word  0              /* Location in RAM of the start of our bootloader */
+#endif
 #else
     ldr    pc, =start_loc    /* jump to the main entry point  */
 
@@ -79,7 +77,7 @@ start_loc:
     #error No bootup key detection implemented for this target
 #endif
 
-    /* Copy bootloader to safe area - 0x21000000 (DRAM) */
+    /* Copy bootloader to safe area - 0x21F00000 (end of DRAM) */
     /* TODO: Adjust this for other targets - DRAM + DRAMSIZE - 0x100000 */
     ldr    r0, [pc, #-28]
     mov    r1, #0x22000000