diff --git a/kernel/dev/at/com.inc b/kernel/dev/at/com.inc
index 9d86b7f..1c50143 100644
--- a/kernel/dev/at/com.inc
+++ b/kernel/dev/at/com.inc
@@ -2,3 +2,6 @@
 
 com_probe:
 	ret
+
+com_irq:
+	iret
diff --git a/kernel/dev/at/floppy.inc b/kernel/dev/at/floppy.inc
index 4503bea..7440a11 100644
--- a/kernel/dev/at/floppy.inc
+++ b/kernel/dev/at/floppy.inc
@@ -1,4 +1,8 @@
 	;; File: floppy.inc
+	;;
+	;; Usefull links:
+	;; - <https://wiki.osdev.org/Floppy_Disk_Controller>
+	;; - <datasheet at http://www.osdever.net/documents/82077AA_FloppyControllerDatasheet.pdf>
 
 CMOS_FLOPPY_TYPE = 0x10
 
@@ -30,6 +34,8 @@ floppy_probe:
 @@:
 	ret
 
+floppy_irq:
+	iret
 
 szMsgFloppy0Found db "floppy0: Found", 0
 szMsgFloppy1Found db "floppy1: Found", 0
diff --git a/kernel/dev/at/ne2k.inc b/kernel/dev/at/ne2k.inc
index c159e0e..9f0b1d0 100644
--- a/kernel/dev/at/ne2k.inc
+++ b/kernel/dev/at/ne2k.inc
@@ -7,3 +7,6 @@ NE2K_IOBASE = 0x300
 
 ne2k_probe:
 	ret
+
+ne2k_irq:
+	iret
diff --git a/kernel/fs/fat.inc b/kernel/fs/fat.inc
index 265b401..68d030b 100644
--- a/kernel/fs/fat.inc
+++ b/kernel/fs/fat.inc
@@ -1 +1,9 @@
 	;; File: fat.inc
+
+FAT_SECTOR_SIZE = 512
+FAT_MDIR_SIZE   = 32
+
+struc FatBootSector {
+	.jump   db 3 dup(?)
+	.banner db 8 dup(?)
+}
diff --git a/kernel/vfs.inc b/kernel/vfs.inc
index 0ba3f18..27cb21a 100644
--- a/kernel/vfs.inc
+++ b/kernel/vfs.inc
@@ -76,3 +76,4 @@ vfs_init:
 	ret
 
 	
+pRootFS dd 0