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x86: add intel microcode entries to grub config

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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@o2.pl>
This commit is contained in:
Tomasz Maciej Nowak 2018-11-20 17:20:43 +01:00 committed by John Crispin
parent ad83fde30d
commit 546fced2a2
4 changed files with 12 additions and 4 deletions
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2
target/linux/x86/base-files/lib/preinit/02_load_x86_ucode
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@ -2,9 +2,11 @@
# Copyright (C) 2018 OpenWrt.org # Copyright (C) 2018 OpenWrt.org
do_load_x86_ucode() { do_load_x86_ucode() {
if grep -q AuthenticAMD /proc/cpuinfo; then
if [ -e "/sys/devices/system/cpu/microcode/reload" ]; then if [ -e "/sys/devices/system/cpu/microcode/reload" ]; then
echo 1 > /sys/devices/system/cpu/microcode/reload echo 1 > /sys/devices/system/cpu/microcode/reload
fi fi
fi
} }
boot_hook_add preinit_main do_load_x86_ucode boot_hook_add preinit_main do_load_x86_ucode

4
target/linux/x86/image/Makefile
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@ -9,8 +9,8 @@ include $(INCLUDE_DIR)/image.mk
export PATH=$(TARGET_PATH):/sbin export PATH=$(TARGET_PATH):/sbin
GRUB2_MODULES = biosdisk boot chain configfile ext2 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 vga GRUB2_MODULES_ISO = biosdisk boot chain configfile iso9660 linux ls part_msdos reboot serial test vga
GRUB_TERMINALS = GRUB_TERMINALS =
GRUB_SERIAL_CONFIG = GRUB_SERIAL_CONFIG =
GRUB_TERMINAL_CONFIG = GRUB_TERMINAL_CONFIG =

3
target/linux/x86/image/grub-iso.cfg
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@ -7,4 +7,7 @@ set root='(cd)'
menuentry "@TITLE@" { menuentry "@TITLE@" {
linux /boot/vmlinuz @CMDLINE@ noinitrd linux /boot/vmlinuz @CMDLINE@ noinitrd
if [ -s /boot/intel-ucode.img ]; then
initrd /boot/intel-ucode.img
fi
} }

3
target/linux/x86/image/grub.cfg
View File

@ -7,6 +7,9 @@ set root='(@ROOT@)'
menuentry "@TITLE@" { menuentry "@TITLE@" {
linux /boot/vmlinuz @CMDLINE@ noinitrd linux /boot/vmlinuz @CMDLINE@ noinitrd
if [ -s /boot/intel-ucode.img ]; then
initrd /boot/intel-ucode.img
fi
} }
menuentry "@TITLE@ (failsafe)" { menuentry "@TITLE@ (failsafe)" {
linux /boot/vmlinuz failsafe=true @CMDLINE@ noinitrd linux /boot/vmlinuz failsafe=true @CMDLINE@ noinitrd