x86: Convert microcode format to device-tree-only

To avoid having two microcode formats, adjust the build system to support
obtaining the microcode from the device tree, even in the case where it
must be made available before the device tree can be accessed.

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

Makefile

@@ -947,7 +947,9 @@ ifneq ($(CONFIG_X86_RESET_VECTOR),)
 rom: u-boot.rom FORCE
 
 IFDTOOL=$(objtree)/tools/ifdtool
-IFDTOOL_FLAGS  = -w $(CONFIG_SYS_TEXT_BASE):$(objtree)/u-boot-dtb.bin
+IFDTOOL_FLAGS  = -f 0:$(objtree)/u-boot.dtb
+IFDTOOL_FLAGS += -m 0x$(shell $(NM) u-boot |grep _dt_ucode_base_size |cut -d' ' -f1)
+IFDTOOL_FLAGS += -U $(CONFIG_SYS_TEXT_BASE):$(objtree)/u-boot.bin
 IFDTOOL_FLAGS += -w $(CONFIG_SYS_X86_START16):$(objtree)/u-boot-x86-16bit.bin
 
 ifneq ($(CONFIG_HAVE_INTEL_ME),)

arch/x86/cpu/queensbay/tnc_car.S

@@ -116,12 +116,9 @@ temp_ram_init_romstack:
 	.long	temp_ram_init_ret
 	.long	temp_ram_init_params
 temp_ram_init_params:
-	.long	ucode_start		/* microcode base */
-	.long	ucode_size		/* microcode size */
+_dt_ucode_base_size:
+	/* These next two fields are filled in by ifdtool */
+	.long	0			/* microcode base */
+	.long	0			/* microcode size */
 	.long	CONFIG_SYS_MONITOR_BASE	/* code region base */
 	.long	CONFIG_SYS_MONITOR_LEN	/* code region size */
-
-	.balign	4
-ucode_start:
-	.include "arch/x86/cpu/queensbay/M0220661105.inc"
-ucode_size = ( . - ucode_start)

arch/x86/dts/crownbay.dts

@@ -50,4 +50,11 @@
 			memory-map = <0xffe00000 0x00200000>;
 		};
 	};
+
+	microcode {
+		update@0 {
+#include "microcode/m0220661105_cv.dtsi"
+		};
+	};
+
 };