Actually it seems using HD ADF image is what is causing this issue with 6 sectors. Using DD images seems to work fine.

Fix panic(). Now panic() in _start.

To try it, do :

TARGET_BOOT_PLATFORM=amiga_m68k jam -j1 -q haiku_loader
dd if=/dev/zero of=haiku.adf count=1760
dd if=generated/objects/haiku/m68k/release/system/boot/haiku_loader of=haiku.adf conv=notrunc
uae -s floppy0=haiku.adf -s cpu_type=68020/68881 -s chipmem_size=8 -i


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38952 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/boot/platform/amiga_m68k/debug.cpp

@@ -19,16 +19,26 @@
 void
 panic(const char *format, ...)
 {
-	struct AlertMessage {
-		uint16	column;
-		uint8	line;
-		char	messages[14+512];
-	} alert = {
+	static struct AlertMessage {
+		uint16	column1;
+		uint8	line1;
+		char	message[14];
+		uint8	cont;
+		uint16	column2;
+		uint8	line2;
+		char	buffer[512];
+		uint8	end;
+		
+	} _PACKED alert = {
 		10, 12,
-		"*** PANIC ***"
+		"*** PANIC ***",
+		1,
+		10, 22,
+		"",
+		0
 	};
 
-	char *buffer = &alert.messages[14];
+	char *buffer = alert.buffer;
 	va_list list;
 
 	//platform_switch_to_text_mode();
@@ -36,10 +46,10 @@ panic(const char *format, ...)
 	memset(buffer, 0, 512);
 
 	va_start(list, format);
-	vsnprintf(buffer, 512-1, format, list);
+	vsnprintf(buffer, 512, format, list);
 	va_end(list);
 
-	DisplayAlert(DEADEND_ALERT, &alert, 30);
+	DisplayAlert(DEADEND_ALERT, &alert, 40);
 
 	clear_key_buffer();
 	wait_for_key();

src/system/boot/platform/amiga_m68k/shell.S

@@ -493,7 +493,7 @@ sNumSectors:
 	// 0x180 is the allowed maximum, as the zipped TAR with the
 	// kernel and the boot module might start at offset 192 kB
 	//.word	0x0300 //0x0180
-	.word	6//BOOT_ARCHIVE_IMAGE_OFFSET*2
+	.word	BOOT_ARCHIVE_IMAGE_OFFSET*2
 
 sBootIOReq:
 	.long	0

src/system/boot/platform/amiga_m68k/start.cpp

@@ -117,13 +117,10 @@ platform_exit(void)
 	while (true) {}
 }
 
-extern "C" void _floppy_err_alert();
-
 extern "C" void
 _start(void)
 {
-_floppy_err_alert();
-	panic("plop");
+	panic("plop %d", 1234);
 	stage2_args args;
 
 	//asm("cld");			// Ain't nothing but a GCC thang.