Make the Nano2G bootloader actually function as a bootloader. The resulting bootloader-ipodnano2g.ipod file needs to be encrypted on a target using the crypt_firmware plugin to create bootloader-ipodnano2g.ipodx, which can then be written to the firmware partition using the ipodpatcher patch at FS#10609. Dual-booting doesn't work yet - only Rockbox can be run.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23084 a1c6a512-1295-4272-9138-f99709370657

bootloader/SOURCES

@@ -1,6 +1,8 @@
 common.c
 
-#if defined(IPOD_ARCH)
+#if defined(IPOD_NANO2G)
+ipodnano2g.c
+#elif defined(IPOD_ARCH)
 ipod.c
 #elif defined(GIGABEAT_F)
 gigabeat.c
@@ -55,7 +57,4 @@ show_logo.c
 #elif defined(LYRE_PROTO1)
 lyre_proto1.c
 show_logo.c
-#elif defined(IPOD_NANO2G)
-ipodnano2g.c
-show_logo.c
 #endif

bootloader/ipodnano2g.c

@@ -45,56 +45,127 @@
 #include "file.h"
 #include "common.h"
 
+/* Safety measure - maximum allowed firmware image size. 
+   The largest known current (October 2009) firmware is about 6.2MB so 
+   we set this to 8MB. 
+*/
+#define MAX_LOADSIZE (8*1024*1024)
+
+/* The buffer to load the firmware into */
+unsigned char *loadbuffer = (unsigned char *)0x08000000;
+
+/* Bootloader version */
 char version[] = APPSVERSION;
 
-/* Show the Rockbox logo - in show_logo.c */
-extern int show_logo(void);
-
 extern int line;
 
+void fatal_error(void)
+{
+    extern int line;
+    bool holdstatus=false;
+
+    /* System font is 6 pixels wide */
+    printf("Hold MENU+SELECT to");
+    printf("reboot then SELECT+PLAY");
+    printf("for disk mode");
+    lcd_update();
+
+    while (1) {
+        if (button_hold() != holdstatus) {
+            if (button_hold()) {
+                holdstatus=true;
+                lcd_puts(0, line, "Hold switch on!");
+            } else {
+                holdstatus=false;
+                lcd_puts(0, line, "               ");
+            }
+            lcd_update();
+        }
+    }
+}
+
 void main(void)
 {
     int i;
+    int btn;
+    int rc;
+    bool button_was_held;
+
+    /* Check the button hold status as soon as possible - to 
+       give the user maximum chance to turn it on in order to
+       reset the settings in rockbox. */
+    button_was_held = button_hold();
 
     system_init();
-    i2c_init();
     kernel_init();
 
+    i2c_init();
+
     enable_irq();
 
+    backlight_init(); /* Turns on the backlight */
+
     lcd_init();
+    font_init();
 
-    _backlight_init();
+    lcd_set_foreground(LCD_WHITE);
+    lcd_set_background(LCD_BLACK);
+    lcd_clear_display();
 
-    lcd_puts_scroll(0,0,"+++ this is a very very long line to test scrolling. ---");
+//    button_init();
-    verbose = 0;
-    i = 0;
-    while (!button_hold()) {
-        line = 1;
 
-        printf("i=%d",i++);
+    btn=0; /* TODO */
-        printf("TBCNT:   %08x",TBCNT);
-        printf("GPIO  0: %08x",PDAT0);
-        printf("GPIO  1: %08x",PDAT1);
-        printf("GPIO  2: %08x",PDAT2);
-        printf("GPIO  3: %08x",PDAT3);
-        printf("GPIO  4: %08x",PDAT4);
-        printf("GPIO  5: %08x",PDAT5);
-        printf("GPIO  6: %08x",PDAT6);
-        printf("GPIO  7: %08x",PDAT7);
-        printf("GPIO 10: %08x",PDAT10);
-        printf("GPIO 11: %08x",PDAT11);
-        printf("GPIO 13: %08x",PDAT13);
-        printf("GPIO 14: %08x",PDAT14);
 
-        lcd_update();
+    /* Enable bootloader messages */
+    if (btn==BUTTON_RIGHT)
+        verbose = true;
+
+    lcd_setfont(FONT_SYSFIXED);
+
+    printf("Rockbox boot loader");
+    printf("Version: %s", version);
+
+    i = storage_init();
+
+    if (i != 0) {
+        printf("ATA error: %d", i);
+        fatal_error();
     }
 
+    disk_init();
+    rc = disk_mount_all();
+    if (rc<=0)
+    {
+        printf("No partition found");
+        fatal_error();
+    }
+
+    if (button_was_held || (btn==BUTTON_MENU)) {
+        /* If either the hold switch was on, or the Menu button was held, then 
+           try the Apple firmware */
+
+        printf("Loading original firmware...");
+
+        /* TODO */
+        fatal_error();
+    } else {
+        printf("Loading Rockbox...");
+        rc=load_firmware(loadbuffer, BOOTFILE, MAX_LOADSIZE);
+
+        if (rc != EOK) {
+            printf("Error!");
+            printf("Can't load " BOOTFILE ": ");
+            printf(strerror(rc));
+            fatal_error();
+        }
+
+        printf("Rockbox loaded.");
+    }
+
+    /* If we get here, we have a new firmware image at 0x08000000, run it */
+
     disable_irq();
 
-    /* Branch back to iBugger entry point */
+    /* Branch to start of DRAM */
-    asm volatile("ldr pc, =0x08640568");
+    asm volatile("ldr pc, =0x08000000");
-
-    /* We never reach here */
-    while(1);
 }

firmware/target/arm/s5l8700/boot.lds

@@ -9,14 +9,14 @@ OUTPUT_FORMAT(elf32-bigarm)
 OUTPUT_ARCH(arm)
 STARTUP(target/arm/s5l8700/crt0.o)
 
-/* DRAMORIG is in fact 0x08000000 but remapped to 0x0 */
 #define DRAMORIG 0x08000000
 #define DRAMSIZE (MEMORYSIZE * 0x100000)
 
-#define IRAMORIG 0x22000000
 #if CONFIG_CPU==S5L8701
+#define IRAMORIG 0x0
 #define IRAMSIZE 176K
 #else
+#define IRAMORIG 0x22000000
 #define IRAMSIZE 256K
 #endif
 
@@ -91,7 +91,11 @@ SECTIONS
      _fiqstackend = .;
   } > IRAM
 
-  .bss : {
+  /* The bss section is too large for IRAM - we just move it 12MB into the
+     DRAM */
+
+  . = DRAMORIG;
+  .bss . + (12*1024*1024): {
      _edata = .;
      *(.bss*);
      *(.ibss);
@@ -99,5 +103,5 @@ SECTIONS
      *(COMMON);
     . = ALIGN(0x4);
      _end = .;
-   } > IRAM
+  } > DRAM
 }

firmware/target/arm/s5l8700/crt0.S

@@ -27,7 +27,11 @@
     .global    _newstart
     /* Exception vectors */
 start:
+#if CONFIG_CPU==S5L8701 && defined(BOOTLOADER)
+    b newstart2
+#else
     b _newstart
+#endif
     ldr pc, =undef_instr_handler
     ldr pc, =software_int_handler
     ldr pc, =prefetch_abort_handler
@@ -88,7 +92,22 @@ newstart2:
     orr r2, r2, #1
     bic r2, r2, #0x10000
     str r2, [r1] // remap iram to address 0x0
-#endif
+
+#ifdef BOOTLOADER
+    /* Relocate ourself to IRAM - we have been loaded to DRAM */
+    mov    r0, #0x08000000   /* source (DRAM) */
+    mov    r1, #0x00000000   /* dest (IRAM) */
+    ldr    r2, =_dataend
+1:
+    cmp    r2, r1
+    ldrhi  r3, [r0], #4
+    strhi  r3, [r1], #4
+    bhi    1b
+
+    ldr    pc, =start_loc    /* jump to the relocated start_loc:  */
+start_loc:
+#endif /* BOOTLOADER */
+#endif /* CONFIG_CPU==S5L8701 */
 
     ldr r1, =0x3c500000 // CLKCON
     ldr r0, =0x00800080

firmware/target/arm/s5l8700/ipodnano2g/ftl-target.h

@@ -25,6 +25,11 @@
 #include "config.h"
 #include "inttypes.h"
 
+#ifdef BOOTLOADER
+/* Bootloaders don't need write access */
+#define FTL_READONLY
+#endif
+
 uint32_t ftl_init(void);
 uint32_t ftl_read(uint32_t sector, uint32_t count, void* buffer);
 uint32_t ftl_write(uint32_t sector, uint32_t count, const void* buffer);

tools/configure

@@ -1441,8 +1441,7 @@ fi
     appextra="recorder:gui"
     plugins="yes"
     swcodec="yes"
-    boottool="cp"
+    bootoutput="bootloader-$modelname.ipod"
-    bootoutput="bootloader-$modelname.bin"
     # toolset is the tools within the tools directory that we build for
     # this particular target.
     toolset=$ipodbitmaptools