x86: Allow 16-bit init to be in TPL

At present we support having 16-bit init be in SPL or U-Boot proper, but
not TPL. Add support for this so that TPL can boot.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

Makefile

@@ -1444,6 +1444,7 @@ cmd_ldr = $(LD) $(LDFLAGS_$(@F)) \
 
 u-boot.rom: u-boot-x86-16bit.bin u-boot.bin \
 		$(if $(CONFIG_SPL_X86_16BIT_INIT),spl/u-boot-spl.bin) \
+		$(if $(CONFIG_TPL_X86_16BIT_INIT),tpl/u-boot-tpl.bin) \
 		$(if $(CONFIG_HAVE_REFCODE),refcode.bin) FORCE
 	$(call if_changed,binman)
 

arch/x86/Makefile

@@ -20,8 +20,8 @@ endif
 endif
 endif # EFI
 
-head-$(CONFIG_$(SPL_)X86_16BIT_INIT) += arch/x86/cpu/start16.o
-head-$(CONFIG_$(SPL_)X86_16BIT_INIT) += arch/x86/cpu/resetvec.o
+head-$(CONFIG_$(SPL_TPL_)X86_16BIT_INIT) += arch/x86/cpu/start16.o
+head-$(CONFIG_$(SPL_TPL_)X86_16BIT_INIT) += arch/x86/cpu/resetvec.o
 
 libs-y += arch/x86/cpu/
 libs-y += arch/x86/lib/

arch/x86/cpu/intel_common/Makefile

@@ -3,7 +3,7 @@
 # Copyright (c) 2016 Google, Inc
 
 ifdef CONFIG_HAVE_MRC
-obj-$(CONFIG_$(SPL_)X86_32BIT_INIT) += car.o
+obj-$(CONFIG_$(SPL_TPL_)X86_16BIT_INIT) += car.o
 obj-$(CONFIG_$(SPL_)X86_32BIT_INIT) += me_status.o
 obj-$(CONFIG_$(SPL_)X86_32BIT_INIT) += report_platform.o
 obj-$(CONFIG_$(SPL_)X86_32BIT_INIT) += mrc.o

arch/x86/cpu/u-boot-spl.lds

@@ -54,7 +54,7 @@ SECTIONS
 	/DISCARD/ : { *(.interp*) }
 	/DISCARD/ : { *(.gnu*) }
 
-#ifdef CONFIG_SPL_X86_16BIT_INIT
+#if defined(CONFIG_SPL_X86_16BIT_INIT) || defined(CONFIG_TPL_X86_16BIT_INIT)
 	/*
 	 * The following expressions place the 16-bit Real-Mode code and
 	 * Reset Vector at the end of the Flash ROM

scripts/Makefile.spl

@@ -230,7 +230,11 @@ ifeq ($(CONFIG_SYS_SOC),"at91")
 ALL-y	+= $(obj)/boot.bin
 endif
 
+ifdef CONFIG_TPL_BUILD
+ALL-$(CONFIG_TPL_X86_16BIT_INIT) += $(obj)/u-boot-x86-16bit-tpl.bin
+else
 ALL-$(CONFIG_SPL_X86_16BIT_INIT) += $(obj)/u-boot-x86-16bit-spl.bin
+endif
 
 ALL-$(CONFIG_ARCH_ZYNQ)		+= $(obj)/boot.bin
 ALL-$(CONFIG_ARCH_ZYNQMP)	+= $(obj)/boot.bin
@@ -330,7 +334,7 @@ quiet_cmd_objcopy = OBJCOPY $@
 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 
 OBJCOPYFLAGS_$(SPL_BIN)-nodtb.bin = $(SPL_OBJCFLAGS) -O binary \
-		$(if $(CONFIG_SPL_X86_16BIT_INIT),-R .start16 -R .resetvec)
+		$(if $(CONFIG_$(SPL_TPL_)X86_16BIT_INIT),-R .start16 -R .resetvec)
 
 $(obj)/$(SPL_BIN)-nodtb.bin: $(obj)/$(SPL_BIN) FORCE
 	$(call if_changed,objcopy)
@@ -339,6 +343,10 @@ OBJCOPYFLAGS_u-boot-x86-16bit-spl.bin := -O binary -j .start16 -j .resetvec
 $(obj)/u-boot-x86-16bit-spl.bin: $(obj)/u-boot-spl FORCE
 	$(call if_changed,objcopy)
 
+OBJCOPYFLAGS_u-boot-x86-16bit-tpl.bin := -O binary -j .start16 -j .resetvec
+$(obj)/u-boot-x86-16bit-tpl.bin: $(obj)/u-boot-tpl FORCE
+	$(call if_changed,objcopy)
+
 LDFLAGS_$(SPL_BIN) += -T u-boot-spl.lds $(LDFLAGS_FINAL)
 
 # Avoid 'Not enough room for program headers' error on binutils 2.28 onwards.