Automatically copy GM9 payload on newly formatted SDs

A9LH only feature

a9lh.ld

@@ -5,7 +5,8 @@ SECTIONS
     .text.start : { *(.text.start) }
     .text : { *(.text) }
     .data : { *(.data) }
-    .bss : { *(.bss COMMON) }
+    .bss : { __bss_start = .; *(.bss COMMON) }
+    __bss_end = .;
     .rodata : { *(.rodata) }
     . = ALIGN(4);
     __end__ = ABSOLUTE(.);

gateway.ld

@@ -5,7 +5,8 @@ SECTIONS
     .text.start : { *(.text.start) }
     .text : { *(.text) }
     .data : { *(.data) }
-    .bss : { *(.bss COMMON) }
+    .bss : { __bss_start = .; *(.bss COMMON) }
+    __bss_end = .;
     .rodata : { *(.rodata) }
     . = ALIGN(4);
     __end__ = ABSOLUTE(.);

source/abstraction/a9-start.s

@@ -14,6 +14,18 @@ _start:
     bic r4, #(1<<0)            @ - mpu disable
     mcr p15, 0, r4, c1, c0, 0  @ write control register
     
+    @ Clear bss
+    ldr r0, =__bss_start
+    ldr r1, =__bss_end
+    mov r2, #0
+
+    .bss_clr:
+    cmp r0, r1
+    beq .bss_clr_done
+    str r2, [r0], #4
+    b .bss_clr
+    .bss_clr_done:
+    
     @ Give read/write access to all the memory regions
     ldr r5, =0x33333333
     mcr p15, 0, r5, c5, c0, 2 @ write data access

source/abstraction/gw-start.s

@@ -44,6 +44,18 @@ _start:
     bic r4, #(1<<0)            @ - mpu disable
     mcr p15, 0, r4, c1, c0, 0  @ write control register
     
+    @ Clear bss
+    ldr r0, =__bss_start
+    ldr r1, =__bss_end
+    mov r2, #0
+
+    .bss_clr:
+    cmp r0, r1
+    beq .bss_clr_done
+    str r2, [r0], #4
+    b .bss_clr
+    .bss_clr_done:
+    
     @ Give read/write access to all the memory regions
     ldr r5, =0x33333333
     mcr p15, 0, r5, c5, c0, 2 @ write data access

source/godmode.c

@@ -193,6 +193,12 @@ u32 SdFormatMenu(void) {
         return 1;
     }
     
+    if (*(vu32*) 0x101401C0 == 0) {
+        InitSDCardFS(); // on A9LH: copy the payload from mem to SD root
+        FileSetData("0:/arm9loaderhax.bin", (u8*) 0x23F00000, 0x40000, 0, true);
+        DeinitSDCardFS();
+    }
+    
     return 0;
 }