[coreboot] Fwd: Ethernet problem in x200

[Denis 'GNUtoo' Carikli]

On Mon, 27 Mar 2017 16:14:53 +0200
Zoran Stojsavljevic <zoran.stojsavljevic at gmail.com> wrote:

> [user at localhost projects]$ cat dmesg.txt | grep 00:19.0
> [    0.151652] pci 0000:00:19.0: *[8086:294c*] type 00 class 0x020000
> [    0.151694] pci 0000:00:19.0: reg 0x10: [mem 0xe1600000-0xe161ffff]
> [    0.151707] pci 0000:00:19.0: reg 0x14: [mem 0xe1624000-0xe1624fff]
> [    0.151721] pci 0000:00:19.0: reg 0x18: [io  0x3000-0x301f]
> [    0.151802] pci 0000:00:19.0: PME# supported from D0 D3hot D3cold
> [    1.489719] e1000e 0000:00:19.0: Interrupt Throttling Rate
> (ints/sec) set to dynamic conservative mode
> [    1.611526] e1000e 0000:00:19.0: The NVM Checksum Is Not Valid
> *[    1.635873] e1000e: probe of 0000:00:19.0 failed with error -5*
The Lenovo Thinkpad X200 uses a GM45 chipset. This chipset supports
different ways of booting:
(1) Having a boot fimrware occupy all the flash chip, if you do that the
    Ethernet will not work, according to the datasheet.
(2) Having a boot firmware with the management engine firmware.
(3) Having a boot firmware without the management engine firmware.

It is strongly advised to do (3) and follow the corresponding coreboot
documentation. To get a working Ethernet with (3) you need to set a
valid mac address:
In the installation documentation, you are expected to use ich9gen,
however if you use it this way:
> $ ./ich9gen
It will not produce a valid MAC address. You must instead do something
like that, and replace <A-VALID-MAC-ADDRESS> by a valid MAC address:
> $ ./ich9gen --macaddress <A-VALID-MAC-ADDRESS>
To find such MAC address, you have several options:
- Look if it can be found on a sticker on the bottom of your laptop.
- Reflash the original flash content and get it with:
> $ ifconfig -a
or:
> ip link

== Side note ==
According to the wikipedia article on MAC Address[1], the 3 bytes on
the left correspond to a vendor/organisation.
So I got a valid MAC address with the methods mentioned above, and only
kept the 3 bytes on the left, and tested that MAC address:
> 00:1f:16:00:00:00
And it worked on my Lenovo Thinkpad X200.
To use that MAC address, just use:
> $ ./ich9gen --macaddress 

It might be possible that all addresses between 00:1f:16:00:00:00 and
00:1f:16:FF:FF:FF work, but I didn't test that.

References:
-----------
[1]https://en.wikipedia.org/wiki/MAC_address#Address_details

Denis.
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