Difference between revisions of "Problem with error 01C9 - More than one Ethernet devices"
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The solution is to modify the Atheros EEPROM so that the card correctly identifies itself as an "other" instead of an "ethernet" network adapter. No messing with vendor and device ID is necessary. Madwifi drivers will function properly. | The solution is to modify the Atheros EEPROM so that the card correctly identifies itself as an "other" instead of an "ethernet" network adapter. No messing with vendor and device ID is necessary. Madwifi drivers will function properly. | ||
| − | + | A Linux Live CD to remove the error message as well as the 1802-error is now available. http://rapidshare.de/files/12745003/ibm_wifi.iso.html. | |
| + | |||
| + | Download instructions | ||
| + | 1. Click on this link. | ||
| + | 2. In the right column, press "free". | ||
| + | 3. Wait a few seconds, then type the code into the blank field and press "Download via...". | ||
| + | |||
| + | Usage | ||
| + | 0. If you want to use this to remove the 1802 error, do not install your Atheros card yet. | ||
| + | 1. Burn the ISO to a CD or DVD, preferrably a RW. Make sure to open the image instead of burning it as a regular file on the disc. | ||
| + | 2. Boot from the CD. | ||
| + | 3. If you choose to remove the 1802 error, do so and reboot with Ctrl-Alt-Del. | ||
| + | 4. Install the Atheros card if not already present. | ||
| + | 5. Boot from the CD again. | ||
| + | 6. Choose not to apply the 1802. | ||
| + | 7. Select your Atheros card from the list. MAKE SURE IT'S THE CORRECT ONE, a wrong selection may cause damage! | ||
| + | 8. Ctrl-Alt-Del reboots, the 01C9 should be gone. | ||
Revision as of 17:33, 7 February 2006
Problem Description
Certain ThinkPads show a warning message during POST when a WLAN card with an Atheros chipset is present in the MiniPCI slot:
WARNING 01C9: More than one Ethernet devices are found. Remove one of them. Press <Esc> to continue.
At POST, the BIOS conducts a scan for ethernet devices. It does this by reading the "PCI Class Codes" of every connected device. If more than one ethernet device is found, it produces the 01C9 error message. Unlike other wireless cards, which identify themselves as "other" network adapters, Atheros classify themselves as "ethernet". This collides with the internal ethernet controller (also a PCI device) and causes the 01C9 to appear.
Affected Models
Not affected are:
Solution
The solution is to modify the Atheros EEPROM so that the card correctly identifies itself as an "other" instead of an "ethernet" network adapter. No messing with vendor and device ID is necessary. Madwifi drivers will function properly.
A Linux Live CD to remove the error message as well as the 1802-error is now available. http://rapidshare.de/files/12745003/ibm_wifi.iso.html.
Download instructions 1. Click on this link. 2. In the right column, press "free". 3. Wait a few seconds, then type the code into the blank field and press "Download via...".
Usage 0. If you want to use this to remove the 1802 error, do not install your Atheros card yet. 1. Burn the ISO to a CD or DVD, preferrably a RW. Make sure to open the image instead of burning it as a regular file on the disc. 2. Boot from the CD. 3. If you choose to remove the 1802 error, do so and reboot with Ctrl-Alt-Del. 4. Install the Atheros card if not already present. 5. Boot from the CD again. 6. Choose not to apply the 1802. 7. Select your Atheros card from the list. MAKE SURE IT'S THE CORRECT ONE, a wrong selection may cause damage! 8. Ctrl-Alt-Del reboots, the 01C9 should be gone.
