diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index e83a3e52..63745ff8 100644
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -830,6 +830,7 @@ endif # defined(BIN)
 #
 FINALISE_rom	= $(MAKEROM) $(MAKEROM_FLAGS) $(TGT_MAKEROM_FLAGS) \
 		  -i$(IDENT) -s 0 $@
+FINALISE_hrom	= $(FINALISE_rom)
 
 # Some ROMs require specific flags to be passed to makerom.pl
 #
diff --git a/src/arch/i386/Makefile.pcbios b/src/arch/i386/Makefile.pcbios
index ff555593..55ba11d7 100644
--- a/src/arch/i386/Makefile.pcbios
+++ b/src/arch/i386/Makefile.pcbios
@@ -11,6 +11,7 @@ LDFLAGS		+= -N --no-check-sections
 # Media types.
 #
 MEDIA		+= rom
+MEDIA		+= hrom
 MEDIA		+= pxe
 MEDIA		+= kpxe
 MEDIA		+= kkpxe
@@ -30,6 +31,7 @@ MEDIA		+= exe
 # Padding rules
 #
 PAD_rom		= $(PADIMG) --blksize=512 --byte=0xff $@
+PAD_hrom	= $(PAD_rom)
 PAD_dsk		= $(PADIMG) --blksize=512 $@
 PAD_hd		= $(PADIMG) --blksize=32768 $@
 
diff --git a/src/arch/i386/prefix/hromprefix.S b/src/arch/i386/prefix/hromprefix.S
new file mode 100644
index 00000000..03acf1e2
--- /dev/null
+++ b/src/arch/i386/prefix/hromprefix.S
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * ROM prefix that relocates to HIGHMEM_LOADPOINT during POST if PMM allocation
+ * fails. Intended to be used, with caution, on BIOSes that support PCI3.00 but
+ * have limited PMM support, such as most AMI BIOSes.
+ *****************************************************************************
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER )
+
+#define SHRINK_WITHOUT_PMM
+
+#include "romprefix.S"
diff --git a/src/arch/i386/prefix/romprefix.S b/src/arch/i386/prefix/romprefix.S
index cb474e81..d695fd92 100644
--- a/src/arch/i386/prefix/romprefix.S
+++ b/src/arch/i386/prefix/romprefix.S
@@ -351,6 +351,7 @@ got_pmm: /* PMM allocation succeeded */
 	call	print_character
 	movw	%si, %ax
 	call	print_hex_byte
+pmm_copy:
 	/* Copy ROM to PMM block */
 	xorw	%ax, %ax
 	movw	%ax, %es
@@ -362,7 +363,19 @@ got_pmm: /* PMM allocation succeeded */
 	movl	%edi, decompress_to
 	/* Shrink ROM */
 	movb	$_prefix_memsz_sect, romheader_size
+#ifdef SHRINK_WITHOUT_PMM
+	jmp	pmm_done
 pmm_fail:
+	/* Print marker and copy ourselves to high memory */
+	movl	$HIGHMEM_LOADPOINT, image_source
+	xorw	%di, %di
+	movb	$( '!' ), %al
+	call	print_character
+	jmp	pmm_copy
+pmm_done:
+#else
+pmm_fail:
+#endif
 	/* Restore upper register halves */
 	popal
 no_pmm: