cbmk/config/coreboot/fam15h/patches/0010-Do-not-use-microcode-updates-on-AMD-platforms.patch

From 9cd31ddc0614247bfe2ee5d51f304667b84306c7 Mon Sep 17 00:00:00 2001
From: Leah Rowe <leah@libreboot.org>
Date: Thu, 6 May 2021 17:07:06 +0100
Subject: [PATCH 10/10] Do not use microcode updates on AMD platforms

Coreboot is hardcoding the use of microcode updates on some platforms.

Just nuke it from orbit. This is the libre branch of osboot, so microcode must
not be used.
---
 src/cpu/Makefile.inc                          | 52 +------------------
 src/cpu/amd/family_10h-family_15h/Kconfig     |  1 -
 .../amd/family_10h-family_15h/Makefile.inc    | 10 +---
 3 files changed, 2 insertions(+), 61 deletions(-)

diff --git a/src/cpu/Makefile.inc b/src/cpu/Makefile.inc
index 66ee2f9169..dcf02d5f67 100644
--- a/src/cpu/Makefile.inc
+++ b/src/cpu/Makefile.inc
@@ -16,54 +16,4 @@ $(eval $(call create_class_compiler,cpu_microcode,x86_32))
 ## Rules for building the microcode blob in CBFS
 ################################################################################
 
-ifneq ($(CONFIG_CPU_MICROCODE_MULTIPLE_FILES), y)
-cbfs-files-$(CONFIG_USE_CPU_MICROCODE_CBFS_BINS) += cpu_microcode_blob.bin
-endif
-
-ifeq ($(CONFIG_CPU_MICROCODE_CBFS_EXTERNAL_HEADER),y)
-cbfs-files-y  += cpu_microcode_blob.bin
-cpu_microcode_blob.bin-file = $(objgenerated)/microcode.bin
-
-$(objgenerated)/microcode.bin: $(call strip_quotes,$(CONFIG_CPU_MICROCODE_HEADER_FILES))
-	echo "   util/scripts/ucode_h_to_bin.sh $(objgenerated)/microcode.bin \"$(CONFIG_CPU_MICROCODE_HEADER_FILES)\""
-	util/scripts/ucode_h_to_bin.sh $(objgenerated)/microcode.bin $(CONFIG_CPU_MICROCODE_HEADER_FILES)
-endif
-
-ifeq ($(CONFIG_CPU_MICROCODE_CBFS_EXTERNAL_BINS),y)
-cpu_microcode_bins := $(call strip_quotes,$(CONFIG_CPU_UCODE_BINARIES))
-endif
-# otherwise `cpu_microcode_bins` should be filled by platform makefiles
-
-# We just mash all microcode binaries together into one binary to rule them all.
-# This approach assumes that the microcode binaries are properly padded, and
-# their headers specify the correct size. This works fairly well on isolatied
-# updates, such as Intel and some AMD microcode, but won't work very well if the
-# updates are wrapped in a container, like AMD's microcode update container. If
-# there is only one microcode binary (i.e. one container), then we don't have
-# this issue, and this rule will continue to work.
-$(obj)/cpu_microcode_blob.bin: $$(wildcard $$(cpu_microcode_bins))
-	for bin in $(cpu_microcode_bins); do \
-		if [ ! -f "$$bin" ]; then \
-			echo "Microcode error: $$bin does not exist"; \
-			NO_MICROCODE_FILE=1; \
-		fi; \
-	done; \
-	if [ -n "$$NO_MICROCODE_FILE" ]; then \
-		if [ -z "$(CONFIG_USE_BLOBS)" ] && [ -n "$(CONFIG_CPU_MICROCODE_CBFS_DEFAULT_BINS)" ]; then \
-			echo "Try enabling binary-only repository in Kconfig 'General setup' menu."; \
-		fi; \
-		false; \
-	fi
-	$(if $^,,false) # fail if no file is given at all
-	@printf "    MICROCODE  $(subst $(obj)/,,$(@))\n"
-	@echo $(cpu_microcode_bins)
-	cat $^ > $@
-
-cpu_microcode_blob.bin-file ?= $(obj)/cpu_microcode_blob.bin
-cpu_microcode_blob.bin-type := microcode
-
-ifneq ($(CONFIG_CPU_MICROCODE_CBFS_LOC),)
-cpu_microcode_blob.bin-COREBOOT-position := $(CONFIG_CPU_MICROCODE_CBFS_LOC)
-else
-cpu_microcode_blob.bin-align := 16
-endif
+# No microcode permitted in this version of coreboot.
diff --git a/src/cpu/amd/family_10h-family_15h/Kconfig b/src/cpu/amd/family_10h-family_15h/Kconfig
index ad4f5f4ba6..21150ab1a7 100644
--- a/src/cpu/amd/family_10h-family_15h/Kconfig
+++ b/src/cpu/amd/family_10h-family_15h/Kconfig
@@ -8,7 +8,6 @@ config CPU_AMD_MODEL_10XXX
 	select TSC_SYNC_LFENCE
 	select UDELAY_LAPIC
 	select SUPPORT_CPU_UCODE_IN_CBFS
-	select CPU_MICROCODE_MULTIPLE_FILES
 	select CAR_GLOBAL_MIGRATION
 
 if CPU_AMD_MODEL_10XXX
diff --git a/src/cpu/amd/family_10h-family_15h/Makefile.inc b/src/cpu/amd/family_10h-family_15h/Makefile.inc
index 7035323026..e0029f562d 100644
--- a/src/cpu/amd/family_10h-family_15h/Makefile.inc
+++ b/src/cpu/amd/family_10h-family_15h/Makefile.inc
@@ -14,12 +14,4 @@ ramstage-y += ram_calc.c
 ramstage-y += monotonic_timer.c
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += powernow_acpi.c
 
-# Microcode for Family 10h, 11h, 12h, and 14h
-cbfs-files-$(CONFIG_CPU_MICROCODE_CBFS_DEFAULT_BINS) += microcode_amd.bin
-microcode_amd.bin-file := 3rdparty/blobs/cpu/amd/family_10h-family_14h/microcode_amd.bin
-microcode_amd.bin-type := microcode
-
-# Microcode for Family 15h
-cbfs-files-$(CONFIG_CPU_MICROCODE_CBFS_DEFAULT_BINS) += microcode_amd_fam15h.bin
-microcode_amd_fam15h.bin-file := 3rdparty/blobs/cpu/amd/family_15h/microcode_amd_fam15h.bin
-microcode_amd_fam15h.bin-type := microcode
+# Microcode deleted in this version of coreboot.
-- 
2.39.2