BRN-Hardware

Energy consumption

cpuburn via 'while true; do expr 1 + 1 > /dev/null ; done'

Netgear WGT634U

• idle 7.3W
• cpuburn +0W
• wifi card +0.8-0.9W

Soekris net4826

• idle 4,9W
• cpuburn via while true; do expr 1 + 1; done +2W
• first wifi card +1W
• first and second wifi +1.7W

Devices were powered by a Netgear power supply. The supply's consumption was meassured with ELV Energie Monitor EM 600.

---

Measuring with Frank's Multimeter G1004.500 directly at the device and an assumed voltage of 16 V.

Soekris net4826

• idle 200mA => 3.2W
• cpuburn +230mA => +3.68W (??)
• first wifi card +50mA => +0.8W
• first and second wifi +100mA => +1.6W

Soekris net4826

Change Serial baudrate

1. Enter <Ctrl>+P at BIOS initialization, Enter set ConSpeed=115200 and reboot:

comBIOS ver. 1.28 20050529 Copyright (C) 2000-2005 Soekris Engineering.

net4801

0064 Mbyte Memory CPU Geode 233 Mhz

Pri Mas 64MB ATA Flash Disk LBA 977-4-32 62 Mbyte

Slot Vend Dev ClassRev Cmd Stat CL LT HT Base1 Base2 Int ------------------------------------------------------------------- 0:00:0 1078 0001 06000000 0107 0280 00 00 00 00000000 00000000 0:06:0 100B 0020 02000000 0107 0290 00 3F 00 0000E101 A0000000 10 0:14:0 168C 0013 02000001 0116 0290 08 3C 00 A0010000 00000000 11 0:15:0 168C 0013 02000001 0116 0290 08 3C 00 A0020000 00000000 05 0:18:2 100B 0502 01018001 0005 0280 00 00 00 00000000 00000000 0:19:0 0E11 A0F8 0C031008 0117 0280 08 38 00 A0030000 00000000 09

4 Seconds to automatic boot.   Press Ctrl-P for entering Monitor.

comBIOS Monitor. Press ? for help.

> show

ConSpeed = 19200 ConLock = Enabled ConMute = Disabled BIOSentry = Enabled PCIROMS = Enabled PXEBoot = Enabled FLASH = Primary BootDelay = 5 FastBoot = Disabled BootPartition = Disabled BootDrive = 80 81 F0 FF ShowPCI = Enabled Reset = Hard

> set ConSpeed=115200

> reboot

1. Log into Linux shell with root/root
2. Change Grub config:

pyramid:~# sed -i -e 's/19200/115200/' -e 's#--device=/dev/ttyS0#--unit=0#' /boot/grub/menu.lst

1. Change getty config:

pyramid:~# sed -i -e 's/19200/115200/' /etc/inittab