diff --git a/kernel/memlayout.h b/kernel/memlayout.h
index fdfeab7..8ffd538 100644
--- a/kernel/memlayout.h
+++ b/kernel/memlayout.h
@@ -10,7 +10,6 @@
 // 10001000 -- virtio disk 
 // 80000000 -- boot ROM jumps here in machine mode
 //             -kernel loads the kernel here
-// 88000000 -- -initrd fs.img ramdisk image.
 // unused RAM after 80000000.
 
 // the kernel uses physical memory thus:
@@ -42,8 +41,6 @@
 #define PLIC_MCLAIM(hart) (PLIC + 0x200004 + (hart)*0x2000)
 #define PLIC_SCLAIM(hart) (PLIC + 0x201004 + (hart)*0x2000)
 
-#define RAMDISK 0x88000000L
-
 // the kernel expects there to be RAM
 // for use by the kernel and user pages
 // from physical address 0x80000000 to PHYSTOP.