Index: boot/arch/mips32/Makefile.inc
===================================================================
--- boot/arch/mips32/Makefile.inc	(revision eec5795e2eef2157f6ff73e4aaf5aad243747e57)
+++ boot/arch/mips32/Makefile.inc	(revision 13888eb0f3c4f1c5c0c019dbfa84542c18defd23)
@@ -66,5 +66,6 @@
 ifeq ($(MACHINE),msim)
 	RD_DRVS_ESSENTIAL += \
-		platform/msim
+		platform/msim \
+		block/ddisk
 endif