ifeq ($(CONFIG_AIC7XXX_BUILD_FIRMWARE),y)
 $(obj)/aic7xxx_seq.h: $(src)/aic7xxx.seq $(src)/aic7xxx.reg $(obj)/aicasm/aicasm
-       $(obj)/aicasm/aicasm -I$(src) -r $(obj)/aic7xxx_reg.h \
+       $(obj)/aicasm/aicasm -I$(srctree)/$(src) -r $(obj)/aic7xxx_reg.h \
                              $(aicasm-7xxx-opts-y) -o $(obj)/aic7xxx_seq.h \
-                             $(src)/aic7xxx.seq
+                             $(srctree)/$(src)/aic7xxx.seq
 
 $(aic7xxx-gen-y): $(obj)/aic7xxx_seq.h
 else
 
 ifeq ($(CONFIG_AIC79XX_BUILD_FIRMWARE),y)
 $(obj)/aic79xx_seq.h: $(src)/aic79xx.seq $(src)/aic79xx.reg $(obj)/aicasm/aicasm
-       $(obj)/aicasm/aicasm -I$(src) -r $(obj)/aic79xx_reg.h \
+       $(obj)/aicasm/aicasm -I$(srctree)/$(src) -r $(obj)/aic79xx_reg.h \
                              $(aicasm-79xx-opts-y) -o $(obj)/aic79xx_seq.h \
-                             $(src)/aic79xx.seq
+                             $(srctree)/$(src)/aic79xx.seq
 
 $(aic79xx-gen-y): $(obj)/aic79xx_seq.h
 else
 $(obj)/aic79xx_reg_print.c: $(src)/aic79xx_reg_print.c_shipped
 endif
 
-$(obj)/aicasm/aicasm: $(src)/aicasm/*.[chyl]
-       $(MAKE) -C $(src)/aicasm
+$(obj)/aicasm/aicasm: $(srctree)/$(src)/aicasm/*.[chyl]
+       $(MAKE) -C $(srctree)/$(src)/aicasm OUTDIR=$(shell pwd)/$(obj)/aicasm/
 
 PROG=  aicasm
 
+OUTDIR ?= ./
+
 .SUFFIXES= .l .y .c .h
 
 CSRCS= aicasm.c aicasm_symbol.c
 YSRCS= aicasm_gram.y aicasm_macro_gram.y
 LSRCS= aicasm_scan.l aicasm_macro_scan.l
 
-GENHDRS=       aicdb.h $(YSRCS:.y=.h)
-GENSRCS=       $(YSRCS:.y=.c) $(LSRCS:.l=.c)
+GENHDRS=       $(addprefix ${OUTDIR}/,aicdb.h $(YSRCS:.y=.h))
+GENSRCS=       $(addprefix ${OUTDIR}/,$(YSRCS:.y=.c) $(LSRCS:.l=.c))
 
 SRCS=  ${CSRCS} ${GENSRCS}
 LIBS=  -ldb
 clean-files:= ${GENSRCS} ${GENHDRS} $(YSRCS:.y=.output) $(PROG)
 # Override default kernel CFLAGS.  This is a userland app.
-AICASM_CFLAGS:= -I/usr/include -I.
+AICASM_CFLAGS:= -I/usr/include -I. -I$(OUTDIR)
 LEX= flex
 YACC= bison
 YFLAGS= -d
 LFLAGS= -d
 endif
 
-$(PROG):  ${GENHDRS} $(SRCS)
-       $(AICASM_CC) $(AICASM_CFLAGS) $(SRCS) -o $(PROG) $(LIBS)
+$(PROG):  $(OUTDIR) ${GENHDRS} $(SRCS)
+       $(AICASM_CC) $(AICASM_CFLAGS) $(SRCS) -o $(OUTDIR)/$(PROG) $(LIBS)
+
+$(OUTDIR):
+       mkdir -p $(OUTDIR)
 
-aicdb.h:
+$(OUTDIR)/aicdb.h:
        @if [ -e "/usr/include/db4/db_185.h" ]; then            \
-               echo "#include <db4/db_185.h>" > aicdb.h;       \
+               echo "#include <db4/db_185.h>" > $@;    \
         elif [ -e "/usr/include/db3/db_185.h" ]; then          \
-               echo "#include <db3/db_185.h>" > aicdb.h;       \
+               echo "#include <db3/db_185.h>" > $@;    \
         elif [ -e "/usr/include/db2/db_185.h" ]; then          \
-               echo "#include <db2/db_185.h>" > aicdb.h;       \
+               echo "#include <db2/db_185.h>" > $@;    \
         elif [ -e "/usr/include/db1/db_185.h" ]; then          \
-               echo "#include <db1/db_185.h>" > aicdb.h;       \
+               echo "#include <db1/db_185.h>" > $@;    \
         elif [ -e "/usr/include/db/db_185.h" ]; then           \
-               echo "#include <db/db_185.h>" > aicdb.h;        \
+               echo "#include <db/db_185.h>" > $@;     \
         elif [ -e "/usr/include/db_185.h" ]; then              \
-               echo "#include <db_185.h>" > aicdb.h;           \
+               echo "#include <db_185.h>" > $@;                \
         else                                                   \
                echo "*** Install db development libraries";    \
         fi
 # Create a dependency chain in generated files
 # to avoid concurrent invocations of the single
 # rule that builds them all.
-aicasm_gram.c: aicasm_gram.h
-aicasm_gram.c aicasm_gram.h: aicasm_gram.y
+$(OUTDIR)/aicasm_gram.c: $(OUTDIR)/aicasm_gram.h
+$(OUTDIR)/aicasm_gram.c $(OUTDIR)/aicasm_gram.h: aicasm_gram.y
        $(YACC) $(YFLAGS) -b $(<:.y=) $<
-       mv $(<:.y=).tab.c $(<:.y=.c)
-       mv $(<:.y=).tab.h $(<:.y=.h)
+       mv $(<:.y=).tab.c $(OUTDIR)/$(<:.y=.c)
+       mv $(<:.y=).tab.h $(OUTDIR)/$(<:.y=.h)
 
 # Create a dependency chain in generated files
 # to avoid concurrent invocations of the single
 # rule that builds them all.
-aicasm_macro_gram.c: aicasm_macro_gram.h
-aicasm_macro_gram.c aicasm_macro_gram.h: aicasm_macro_gram.y
+$(OUTDIR)/aicasm_macro_gram.c: $(OUTDIR)/aicasm_macro_gram.h
+$(OUTDIR)/aicasm_macro_gram.c $(OUTDIR)/aicasm_macro_gram.h: aicasm_macro_gram.y
        $(YACC) $(YFLAGS) -b $(<:.y=) -p mm $<
-       mv $(<:.y=).tab.c $(<:.y=.c)
-       mv $(<:.y=).tab.h $(<:.y=.h)
+       mv $(<:.y=).tab.c $(OUTDIR)/$(<:.y=.c)
+       mv $(<:.y=).tab.h $(OUTDIR)/$(<:.y=.h)
 
-aicasm_scan.c: aicasm_scan.l
-       $(LEX) $(LFLAGS) -o$@ $<
+$(OUTDIR)/aicasm_scan.c: aicasm_scan.l
+       $(LEX) $(LFLAGS) -o $@ $<
 
-aicasm_macro_scan.c: aicasm_macro_scan.l
-       $(LEX) $(LFLAGS) -Pmm -o$@ $<
+$(OUTDIR)/aicasm_macro_scan.c: aicasm_macro_scan.l
+       $(LEX) $(LFLAGS) -Pmm -o $@ $<