Fix regression in SMDK6400

s3c64xx.c implemented its own nand_read_byte, nand_write_buf and
nand_read_buf functions. This provoked a regression when these functions
were made public by patch 55f429bb39614a16b1bacc9a8bea9ac01a60bfc8.

This deletes these duplicated functions from s3c64xx.c and adds the generic
implementations in nand_base.c to the spl Makefile. It also adds
-ffcuntion-sections and -gc-sections to the compilation flags of the SPL to
avoid errors originating from unused functions in nand_base.c.

Description of the regression:
http://article.gmane.org/gmane.comp.boot-loaders.u-boot/108873

Signed-off-by: Simon Schwarz <simonschwarzcor@gmail.com>
Cc: scottwood@freescale.com
Cc: s-paulraj@ti.com
Cc: albert.u.boot@aribaud.net

drivers/mtd/nand/s3c64xx.c

@@ -28,6 +28,8 @@
 #include <common.h>
 
 #include <nand.h>
+#include <linux/mtd/nand.h>
+
 #include <asm/arch/s3c6400.h>
 
 #include <asm/io.h>
@@ -60,32 +62,6 @@ static void print_oob(const char *header, struct mtd_info *mtd)
 }
 #endif /* S3C_NAND_DEBUG */
 
-#ifdef CONFIG_NAND_SPL
-static u_char nand_read_byte(struct mtd_info *mtd)
-{
-	struct nand_chip *this = mtd->priv;
-	return readb(this->IO_ADDR_R);
-}
-
-static void nand_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
-{
-	int i;
-	struct nand_chip *this = mtd->priv;
-
-	for (i = 0; i < len; i++)
-		writeb(buf[i], this->IO_ADDR_W);
-}
-
-static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
-{
-	int i;
-	struct nand_chip *this = mtd->priv;
-
-	for (i = 0; i < len; i++)
-		buf[i] = readb(this->IO_ADDR_R);
-}
-#endif
-
 static void s3c_nand_select_chip(struct mtd_info *mtd, int chip)
 {
 	int ctrl = readl(NFCONT);

nand_spl/board/samsung/smdk6400/Makefile

@@ -33,12 +33,12 @@ nandobj	:= $(OBJTREE)/nand_spl/
 
 LDSCRIPT= $(TOPDIR)/nand_spl/board/$(BOARDDIR)/u-boot.lds
 LDFLAGS := -T $(nandobj)u-boot.lds -Ttext $(CONFIG_SYS_TEXT_BASE) $(LDFLAGS) \
-	   $(LDFLAGS_FINAL)
+		$(LDFLAGS_FINAL) -gc-sections
 AFLAGS	+= -DCONFIG_NAND_SPL
-CFLAGS	+= -DCONFIG_NAND_SPL
+CFLAGS	+= -DCONFIG_NAND_SPL -ffunction-sections
 
 SOBJS	= start.o cpu_init.o lowlevel_init.o
-COBJS	= nand_boot.o nand_ecc.o s3c64xx.o smdk6400_nand_spl.o
+COBJS	= nand_boot.o nand_ecc.o s3c64xx.o smdk6400_nand_spl.o nand_base.o
 
 SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
@@ -98,6 +98,9 @@ $(obj)smdk6400_nand_spl.c:
 	@rm -f $@
 	@ln -s $(TOPDIR)/board/samsung/smdk6400/smdk6400_nand_spl.c $@
 
+$(obj)nand_base.c:
+	@rm -f $@
+	@ln -s $(TOPDIR)/drivers/mtd/nand/nand_base.c $@
 #########################################################################
 
 $(obj)%.o:	$(obj)%.S