mirror of
https://github.com/mbirth/wiki.git
synced 2024-11-09 13:16:45 +00:00
62 lines
2.0 KiB
Markdown
62 lines
2.0 KiB
Markdown
|
---
|
||
|
|
title: WiFi on the Acer Aspire One
|
||
|
|
layout: default
|
||
|
|
created: 2008-10-21 00:14:48 +0200
|
||
|
|
updated: 2009-09-14 18:48:23 +0200
|
||
|
|
toc: false
|
||
|
|
tags:
|
||
|
|
- know-how
|
||
|
|
- hardware
|
||
|
|
- acer
|
||
|
|
- aspire
|
||
|
|
- wifi
|
||
|
|
---
|
||
|
|
**Chipset:** Atheros AR2425
|
||
|
|
|
||
|
|
Change Regdomain
|
||
|
|
================
|
||
|
|
|
||
|
|
The WiFi card comes set to regdom `0x65` (World/ETSI C) which limits the channels to 1..11. (`iw list` shows
|
||
|
|
channels 12..14 as *disabled*.) In Germany, there are also channels 12 and 13 which are unusable this way. But
|
||
|
|
there's the tool `ath_info` which can read and write the EEPROM on the card and thus also the regdomain.
|
||
|
|
|
||
|
|
First, find the base address of the adapter using
|
||
|
|
|
||
|
|
lspci -vv
|
||
|
|
|
||
|
|
Mine was at address `75200000`. Now you can dump the contents of the EEPROM using
|
||
|
|
|
||
|
|
ath_info 0x75200000
|
||
|
|
|
||
|
|
To write the EEPROM, you have to unlock it by setting a GPIO register, namely the first, to zero. I changed the
|
||
|
|
regdomain to <del>0x00 (=ALL channels available)</del> 0x68 (=EU1 World) using this command:
|
||
|
|
|
||
|
|
ath_info -g 1:0 -w 0x75200000 regdomain 68
|
||
|
|
|
||
|
|
You can find all valid codes by looking at the `DMN_` constants in the
|
||
|
|
[regdom.h](http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/drivers/net/wireless/ath5k/regdom.h) file.
|
||
|
|
|
||
|
|
After unloading the modules: `ath5k`, `ath`, `mac80211` and `cfg80211` and doing a `modprobe ath5k`, the command
|
||
|
|
`iw list` should show the two new channels enabled.
|
||
|
|
|
||
|
|
|
||
|
|
**For older ieee80211 modules**, there's a module option `ieee80211_regdom` for the `cfg80211` module. This takes
|
||
|
|
the values `US`, `JP` or `EU`. Add the following lines to `/etc/modprobe.d/options`:
|
||
|
|
|
||
|
|
options cfg80211 ieee80211_regdom=EU
|
||
|
|
options lbm_cw_cfg80211 ieee80211_regdom=EU
|
||
|
|
|
||
|
|
And after a reboot, you will have channels 12 and 13 available.
|
||
|
|
|
||
|
|
On Jaunty, you have to install the package `iw` and use the following command in e.g. your `/etc/rc.local` to set
|
||
|
|
the regdomain to *Germany*:
|
||
|
|
|
||
|
|
iw reg set DE
|
||
|
|
|
||
|
|
|
||
|
|
Possible errors
|
||
|
|
---------------
|
||
|
|
|
||
|
|
If you get the message `MAC revision 0xffff is not supported!` it means that some other module, likely `ath_hal`
|
||
|
|
and/or `ath_pci` took over your card.
|