iPod: Fix the bootloader so it can load and run the original Apple firmware again. The Rockbox firmware was doing too much to the hardware so we remove most of the initialisation.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8301 a1c6a512-1295-4272-9138-f99709370657

firmware/system.c

@@ -1106,6 +1106,7 @@ int system_memory_guard(int newmode)
 }
 #elif CONFIG_CPU==PP5020
 
+#ifndef BOOTLOADER
 extern void TIMER1(void);
 extern void ipod_4g_button_int(void);
 
@@ -1116,6 +1117,7 @@ void irq(void)
     else if (PP5020_CPU_HI_INT_STAT & PP5020_I2C_MASK)
         ipod_4g_button_int();
 }
+#endif
 
 /* TODO: The following two function have been lifted straight from IPL, and
    hence have a lot of numeric addresses used straight. I'd like to use
@@ -1124,11 +1126,10 @@ void irq(void)
    to extend the funtions to do alternate cache configurations and/or 
    some other CPU frequency scaling. */
 
+#ifndef BOOTLOADER
 static void ipod_init_cache(void)
 {
-/* Initialising the cache in the iPod Video bootloader prevents
-   Rockbox from starting */
-#if !defined(BOOTLOADER) || !defined(APPLE_IPODVIDEO)
+/* Initialising the cache in the iPod bootloader prevents Rockbox from starting */
     unsigned i;
 
     /* cache init mode? */
@@ -1147,7 +1148,6 @@ static void ipod_init_cache(void)
 
     for (i = 0x10000000; i < 0x10002000; i += 16)
         inb(i);
-#endif
 }
     
 static void ipod_set_cpu_speed(void)
@@ -1163,9 +1163,11 @@ static void ipod_set_cpu_speed(void)
 
     outl((inl(0x60006020) & 0x0fffff0f) | 0x20000070, 0x60006020);
 }
+#endif
 
 void system_init(void)
 {
+#ifndef BOOTLOADER
     /* disable all irqs */
     outl(-1, 0x60001138);
     outl(-1, 0x60001128);
@@ -1176,6 +1178,7 @@ void system_init(void)
     outl(-1, 0x6000101c);
     ipod_set_cpu_speed();
     ipod_init_cache();
+#endif
 }
 
 void system_reboot(void)