From b74668b1df5ae19e11384f8a8b595cedfa70432e Mon Sep 17 00:00:00 2001
From: Warner Losh <imp@FreeBSD.org>
Date: Tue, 13 Apr 2010 21:32:06 +0000
Subject: [PATCH] Only compile in uart_cpu_$MACHINE.c if it exists.  I'm not
 sure how useful it will be, but we really need to be keying off something
 other than MACHINE for this anyway since on arm and mips we have lots of
 these running around (one for each SoC family)...

---
 sys/modules/Makefile      | 4 +---
 sys/modules/uart/Makefile | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/sys/modules/Makefile b/sys/modules/Makefile
index f65e7c6d15b..3af154c750b 100644
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -280,7 +280,7 @@ SUBDIR=	${_3dfx} \
 	twe \
 	tx \
 	txp \
-	${_uart} \
+	uart \
 	ubsec \
 	udf \
 	udf_iconv \
@@ -323,8 +323,6 @@ _vpo=		vpo
 # no BUS_SPACE_UNSPECIFIED
 # No barrier instruction support (specific to this driver)
 _sym=		sym
-# no uart_cpu_$MACHINE_ARCH
-_uart=		uart
 # intr_disable() is a macro, causes problems
 _cxgb=		cxgb
 .endif
diff --git a/sys/modules/uart/Makefile b/sys/modules/uart/Makefile
index d47e2abed52..06b3c9bd01d 100644
--- a/sys/modules/uart/Makefile
+++ b/sys/modules/uart/Makefile
@@ -16,7 +16,7 @@ SRCS=	uart_bus_acpi.c ${uart_bus_ebus} uart_bus_isa.c uart_bus_pccard.c \
 	uart_if.c uart_if.h uart_subr.c uart_tty.c
 .if ${MACHINE} == "sun4v"
 SRCS+=	uart_cpu_sparc64.c
-.else
+.elif exists(${CURDIR}/uart_cpu_${MACHINE}.c)
 SRCS+=	uart_cpu_${MACHINE}.c
 .endif
 SRCS+=	bus_if.h card_if.h device_if.h isa_if.h ${ofw_bus_if} pci_if.h \