[OpenWrt-Devel] [PATCH v3 5/6] x86: add intel microcode entries to grub config

[Tomasz Maciej Nowak]

Create initrd enries for x86 images, that'll load intel microcode as
early as possible. To achieve that the test module for grub is enabled
which provides shell-like conditionals. Also restrict the late load of
microcode to AMD processors.

Signed-off-by: Tomasz Maciej Nowak <tomek_n at o2.pl>
---
 target/linux/x86/base-files/lib/preinit/02_load_x86_ucode | 6 ++++--
 target/linux/x86/image/Makefile                           | 4 ++--
 target/linux/x86/image/grub-iso.cfg                       | 3 +++
 target/linux/x86/image/grub.cfg                           | 3 +++
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/target/linux/x86/base-files/lib/preinit/02_load_x86_ucode b/target/linux/x86/base-files/lib/preinit/02_load_x86_ucode
index fb309c75c1..d3a23e24b2 100644
--- a/target/linux/x86/base-files/lib/preinit/02_load_x86_ucode
+++ b/target/linux/x86/base-files/lib/preinit/02_load_x86_ucode
@@ -2,8 +2,10 @@
 # Copyright (C) 2018 OpenWrt.org
 
 do_load_x86_ucode() {
-	if [ -e "/sys/devices/system/cpu/microcode/reload" ]; then
-		echo 1 > /sys/devices/system/cpu/microcode/reload
+	if grep -q AuthenticAMD /proc/cpuinfo; then
+		if [ -e "/sys/devices/system/cpu/microcode/reload" ]; then
+			echo 1 > /sys/devices/system/cpu/microcode/reload
+		fi
 	fi
 }
 
diff --git a/target/linux/x86/image/Makefile b/target/linux/x86/image/Makefile
index 310a143e13..036523e075 100644
--- a/target/linux/x86/image/Makefile
+++ b/target/linux/x86/image/Makefile
@@ -9,8 +9,8 @@ include $(INCLUDE_DIR)/image.mk
 
 export PATH=$(TARGET_PATH):/sbin
 
-GRUB2_MODULES = biosdisk boot chain configfile ext2 linux ls part_msdos reboot serial vga
-GRUB2_MODULES_ISO = biosdisk boot chain configfile iso9660 linux ls part_msdos reboot serial vga
+GRUB2_MODULES = biosdisk boot chain configfile ext2 linux ls part_msdos reboot serial test vga
+GRUB2_MODULES_ISO = biosdisk boot chain configfile iso9660 linux ls part_msdos reboot serial test vga
 GRUB_TERMINALS =
 GRUB_SERIAL_CONFIG =
 GRUB_TERMINAL_CONFIG =
diff --git a/target/linux/x86/image/grub-iso.cfg b/target/linux/x86/image/grub-iso.cfg
index 9c59bdf6d4..5d128aa3aa 100644
--- a/target/linux/x86/image/grub-iso.cfg
+++ b/target/linux/x86/image/grub-iso.cfg
@@ -7,4 +7,7 @@ set root='(cd)'
 
 menuentry "@TITLE@" {
 	linux /boot/vmlinuz @CMDLINE@ noinitrd
+	if [ -s /boot/intel-ucode.img ]; then
+		initrd /boot/intel-ucode.img
+	fi
 }
diff --git a/target/linux/x86/image/grub.cfg b/target/linux/x86/image/grub.cfg
index dedfa0a636..a665686863 100644
--- a/target/linux/x86/image/grub.cfg
+++ b/target/linux/x86/image/grub.cfg
@@ -7,6 +7,9 @@ set root='(@ROOT@)'
 
 menuentry "@TITLE@" {
 	linux /boot/vmlinuz @CMDLINE@ noinitrd
+	if [ -s /boot/intel-ucode.img ]; then
+		initrd /boot/intel-ucode.img
+	fi
 }
 menuentry "@TITLE@ (failsafe)" {
 	linux /boot/vmlinuz failsafe=true @CMDLINE@ noinitrd
-- 
2.19.1


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