System stuck on a black screen or occurred "NMI watchdog" when installing CentOS/RHEL 6&7 in ENPD product with AST VGA

Purpose:

This guide demonstrates how to install the CentOS/RHEL 6&7 on ENPD product (VGA chip: AST2500 ) with the CVE-2019-6260 patch.

Target Audience:

For Advantech TSE, RBU AE, outsourcing service engineer(s) and End customer with the following knowledges  :

• Linux  troubleshooting experiences.

Procedures: 

• Launce the OS image and select "Install system with basic video driver"  and Press the Tab to add the "xdriver=vesa brokenmodules=ast" as boot options.
• Follow the procedures to install the Centos 6.
• Or system occurred following message during the CentOS/RHEL installation.

[  252.197193] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:2:924]

[  255.980313] INFO: task kworker/u897:0:7 blocked for more than 120 seconds.

[  255.987178] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

• When prompted to reboot, add "nomodeset xdriver=vesa brokenmodules=ast" in  boot options again before booting to the operating system.
• Since there is no AST2500 driver for the CentOS/RHEL now, please add the above settings to the grub instead of adding it every bootup.

# vi /boot/grub/grub.conf

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd1,0)
# kernel /vmlinuz-version ro root=/dev/sda2
# initrd /initrd-[generic-]version.img
#boot=/dev/sdb
default=0
timeout=5
splashimage=(hd1,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS 6 (2.6.32-754.el6.x86_64)
root (hd1,0)
kernel /vmlinuz-2.6.32-754.el6.x86_64 ro root=UUID=01f04b4b-02a3-48ea-af37-d9553b9f951e nomodeset rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_NO_LVM rd_NO_DM rhgb quiet nomodeset xdriver=vesa brokenmodules=ast
initrd /initramfs-2.6.32-754.el6.x86_64.img