diff -r 0ffb4e86fcc9 -r a179b74831c9 kernel/eka/memmodel/epoc/flexible/mmu/mrom.cpp
--- a/kernel/eka/memmodel/epoc/flexible/mmu/mrom.cpp	Thu Jul 15 20:11:42 2010 +0300
+++ b/kernel/eka/memmodel/epoc/flexible/mmu/mrom.cpp	Thu Aug 19 11:14:22 2010 +0300
@@ -502,6 +502,8 @@
 		}
 
 	TAny* null = 0;
+	if(aDevice->iType & DPagingDevice::EMediaExtension)
+		__e32_atomic_store_ord_ptr(&iDevice, null);
 	if(!__e32_atomic_cas_ord_ptr(&iDevice, &null, aDevice)) // set iDevice=aDevice if it was originally 0
 		{
 		// ROM paging device already registered...