Tera term note

1. Reset the BMC and the system by executing the macro:

while 1
wait "C:\>"
pause 10

kermit note

In the /root/.kermrc, add the below lines

set line /dev/ttyS0
set speed 38400
set carrier-watch off
set handshake none
set flow-control none

dhcp6c daemon

If you would like to debug IPv6-related issue, you can use the below parameters:

Syslog under Ubuntu

vi /etc/rsyslog.conf

#
# Include all config files in /etc/rsyslog.d/
#
$IncludeConfig /etc/rsyslog.d/*.conf

How to check the EEPROM in Intel X520.

1. Go to IBL to download the latest Intel® Network Connections Tools

2. Boot to DOS, then execute lanconf.exe in the dos/svtools/

3. Select Flash/EEPROM, and choice Raw EEPROM.

Enable UART4 in AST2500

mw 1e6e2000 1688a8a8

mw 1e6e200c e1c47e80

mw 1e78f00c 93

mw 1e78f00c 27 //Baudrate 38400 (divisor =13x3=39=27h)

mw 1e78f00c 13

mw 1e78f000 45 //output 'D'

[Linux]HZ, jiffies and tick

HZ: total timer interrupts per second.
tick: 1/HZ, the time for each timer interrupt.
jiffies: total ticks from Linux boot.

Do something after 1 second, e.g. kernel timer
jiffies + (1 second)/ticks = jiffies + HZ

[Linux]The OS Critical Stop sensor event.

http://openipmi.sourceforge.net/IPMI.txt

上述openipmi user guide有提到當panic timeout發生時，Openipmi可以送筆OS critical stop
event log給BMC。

Simple Linux Socket example

I would like to send the UDP packet carries the syslog payload.

#include the below head file
sys/socket.h
linux/sockios.h
fcntl.h
netdb.h
netinet/ether.h
netpacket/packet.h
net/if.h

The note for Linux shell

1. Iterate the member in the array
declare -a array

for i in "${arrar[@]}"
do
    echo $i
done

簡易DHCP server架設

In Ubuntu,

1. Configure the server IP as 192.168.1.254

2. Configure the default inteface
vi /etc/sysconfig/dhcpd
INTERFACES="eth3"

udhcpc in the Busybox

udhcpc [-Cfbnqtvo] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]
[-p pidfile] [-r IP] [-s script] [-O dhcp-option]...

[Linux]Custom ioctl command for sockets

於network interface可定義下面的 operations

dev->open = henbin_open;
dev->stop = henbin_close;

如有需要透過sockets呼叫custom ioctl，可增加一個如下的ioctl function

Enable kcs debug for OpenIPMI driver

可以透過下列的方式打開kcs debug...
echo 7 > /sys/module/ipmi_si/parameters/kcs_debug

即可在dmesg看到kcs state, 包含兩個數字

第一個數字為driver定義的kcs state:

[Linux]Change the baudrate while uncompressing Linux.

Edit the below source file  and change the BAUD_RATE.

linux/arch/arm/include/asm/soc-ast2400/lowlevel_serial.h

OpenBMC study

1. 如果遇到下面header file找不到__NR_setns的問題，可以把該header file後半部#if 0掉。

/poky/build/tmp/work/x86_64-linux/util-linux-native/2.24.1-r0/util-linux-2.24.1/include/namespace.h


2. 如果想改掉default root's password ('0penBmc')，可以到下面的路徑去做修改。
poky/build/conf/local.conf

3. OpenBMC沒有支援nfs protocol，但可以使用tftp方式把改好的tool/demand丟到/mnt/data (jffs2 rw)或者/(rootfs rw)下面去執行。

4. ipmid是處理IPMI request的main task，透過UNIX socket，聆聽來自/tmp/ipmi_socket的request。