spl, common, serial: build SPL without serial support

This patch enables building SPL without
CONFIG_SPL_SERIAL_SUPPORT support.

Signed-off-by: Heiko Schocher <hs@denx.de>
[trini: Ensure we build arch/arm/imx-common on mx28]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/common/Makefile b/common/Makefile
index 6dc4c89..dc82433 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -251,7 +251,11 @@
 obj-$(CONFIG_SPD_EEPROM) += ddr_spd.o
 obj-$(CONFIG_HWCONFIG) += hwconfig.o
 obj-$(CONFIG_BOUNCE_BUFFER) += bouncebuf.o
+ifdef CONFIG_SPL_BUILD
+obj-$(CONFIG_SPL_SERIAL_SUPPORT) += console.o
+else
 obj-y += console.o
+endif
 obj-$(CONFIG_CROS_EC) += cros_ec.o
 obj-y += dlmalloc.o
 ifdef CONFIG_SYS_MALLOC_F_LEN
diff --git a/common/cli_readline.c b/common/cli_readline.c
index 9a9fb35..c1476e4 100644
--- a/common/cli_readline.c
+++ b/common/cli_readline.c
@@ -597,7 +597,7 @@
 					puts(tab_seq + (col & 07));
 					col += 8 - (col & 07);
 				} else {
-					char buf[2];
+					char __maybe_unused buf[2];
 
 					/*
 					 * Echo input using puts() to force an
diff --git a/common/cli_simple.c b/common/cli_simple.c
index 6c65cc6..00a8d2f 100644
--- a/common/cli_simple.c
+++ b/common/cli_simple.c
@@ -68,7 +68,7 @@
 	/* 1 = waiting for '(' or '{' */
 	/* 2 = waiting for ')' or '}' */
 	/* 3 = waiting for '''  */
-	char *output_start = output;
+	char __maybe_unused *output_start = output;
 
 	debug_parser("[PROCESS_MACROS] INPUT len %zd: \"%s\"\n", strlen(input),
 		     input);
diff --git a/common/image.c b/common/image.c
index 9efacf8..c3616e2 100644
--- a/common/image.c
+++ b/common/image.c
@@ -54,6 +54,10 @@
 #include <u-boot/md5.h>
 #include <time.h>
 #include <image.h>
+
+#ifndef __maybe_unused
+# define __maybe_unused		/* unimplemented */
+#endif
 #endif /* !USE_HOSTCC*/
 
 #include <u-boot/crc.h>
@@ -274,7 +278,7 @@
 
 static void image_print_type(const image_header_t *hdr)
 {
-	const char *os, *arch, *type, *comp;
+	const char __maybe_unused *os, *arch, *type, *comp;
 
 	os = genimg_get_os_name(image_get_os(hdr));
 	arch = genimg_get_arch_name(image_get_arch(hdr));
@@ -299,7 +303,7 @@
 void image_print_contents(const void *ptr)
 {
 	const image_header_t *hdr = (const image_header_t *)ptr;
-	const char *p;
+	const char __maybe_unused *p;
 
 	p = IMAGE_INDENT_STRING;
 	printf("%sImage Name:   %.*s\n", p, IH_NMLEN, image_get_name(hdr));