11:43 a.m.
See inline
Best Regard
Kai
From: Intel-KGT [mailto:intel-kgt-bounces@lists.01.org] On Behalf Of Vipat,
Harshawardhan
Sent: Tuesday, September 15, 2015 4:21 AM
To: Nibinbin; intel-kgt(a)lists.01.org
Subject: Re: [iKGT] 【ikgt】debug mode
Please try following steps. We will also add these to the readme.txt soon.
Regards
-harsh
How to Debug
This section describes how to enable debug messages from various components on serial port
during system bootup.
Serial Port connection
Finding serial port address:
1. $ dmesg | grep tty
2. Check for address associated with the serial port ttyS0. For most machines, it is
<ttyS0 addr> = 0x3f8.
Note: If serial port address is different on your machine, use that instead of 0x3f8 while
following instructions on this section.
Set up connection through serial port:
1. Connect your development machine, com1 to another machine, com2 where you will
collect debug messages.
[Kai] I’m confused. It looks like you need to have 2 com ports. Suggest to change to
“Connect your development machine with your test machine through serial port”
1. Install minicom and set up serial port on both machines. Use 115200 as the baud
rate. For more info on this see https://help.ubuntu.com/community/Minicom.
2. Test whether serial port is properly setup by typing in minicom on com1 and see if
it's being displayed in real time on com2 and vice versa.
[Kai] change “com1” to “development machine” and “com2” to “test machine”
Kernel Messages
Enable debug output from kernel to go on serial port:
1. Update grub default configure file to print linux kernel log to screen
$ sudo vi /etc/default/grub
2. Make following changes:
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200n8". The ttyS0
should be changed to your real serial port name.
3. Note: The above cmdline for linux kernel is enough. If you want more log before
serial port init, you can change the cmdline like below:
GRUB_CMDLINE_LINUX_DEFAULT="debug ignore_loglevel log_buf_len=10M
print_fatal_signals=1 LOGLEVEL=8 earlyprintk=vga,keep sched_debug console=tty0
console=ttyS0,115200n8"
Detail info: https://wiki.archlinux.org/index.php/Boot_debugging
$ sudo update-grub
4. Double check linux kernel can print to screen and serial port both.
Ikgt & Tboot Messages
Enable debug output from tboot, ikgt loader, and ikgt to go on serial port:
1. Edit grub.d/20_linux_ikgt_tboot file. Edit value of ikt_log and tboot_log in all
instances:
if [ -d /sys/firmware/efi ] ; then
ikgt_log="iobase=0x3f8"
# there's no vga console available under EFI
tboot_log="logging=serial,memory serial=115200,8n1,0x3f8 "
else
ikgt_log="iobase=0x3f8"
tboot_log="logging=serial,vga,memory serial=115200,8n1,0x3f8 "
fi
2) Update grub.
$ sudo update-grub
If you wish to change things only temporarily
1. Press ‘e’ to edit the selected boot entry. Modify ikgt entry as needed, press F10
From: Intel-KGT [mailto:intel-kgt-bounces@lists.01.org] On Behalf Of Nibinbin
Sent: Thursday, September 10, 2015 8:31 PM
To: intel-kgt@lists.01.org<mailto:intel-kgt@lists.01.org>
Subject: [iKGT] 【ikgt】debug mode
Hi，
I’d like to use IKGT with debug mode,but no serial output based on the version 1.1.
I have done :
1、 build ikgt with “make debug=1”
2、 install ikgt with “make install debug=1”
it seems that something else should be configed.
Best wishes，
Robin Ni