#1 ThinkPad x220: problem with a custom BIOS by _nobody_ 25.05.2016 06:27

Hello to all,

I ran into interesting problem while doing some work, and I would like to get some opinions from this forum (I hope CodeRush, with his extensive experience, can help here).

Here is the description of the problem:

> Recently I bought a refurbished x220 and flashed it with a custom BIOS (Lenovo ThinkPad
> x220_1.40-(8DET70WW)-8duj26us_NWL_ADV_AES_PM_Speedo) because I wanted to unlock
> the RAM speed to be 1866MHz (max RAM speed is locked to 1333Mhz in official BIOS),
> white-list some Wi-Fi cards, Advanced Chipset Config menu, etc.
> This custom BIOS worked perfectly until I changed some settings related with Intel VT-x. If I
> recall correctly, I activated SR-IOV for PCI-E, saved and exited and after that x220 = BRICKED.
> I tried every typical troubleshooting/workaround (Removing as much HW as possible, unplug
> BIOS battery for hours, etc), nothing worked.

This is peculiar... How SR-IOV feature/settings could break the BIOS??? Never saw such or similar brick.

Taking to account that introduced custom BIOS (Lenovo ThinkPad x220_1.40-(8DET70WW)-8duj26us_NWL_ADV_AES_PM_Speedo) added (probably) additional few Memory Reference Code algorithms to make DDR3 work @ 1866MHz, I have no clue how these two parameters (SR-IOV and MRC) are connected/in relations.

It is, after all, Sandy Bridge CORE: http://thinkwiki.de/X220#Technische_Daten

Any clues, advises, addendums, kludges, or similar experiences to share with me?

Thank you,

#2 RE: ThinkPad x220: problem with a custom BIOS by CodeRush 25.05.2016 07:28


Get your current SPI flash dumped, change the value of SR-IOV back to default (it's store in NVRAM variable called "Setup") and flash the result back. You modified BIOS has unlocked BIOS Setup, and every settings hidden were hidden on purpose, so it's no surprise it's bricked now. You can upload your dump and I'll show what to change.

#3 RE: ThinkPad x220: problem with a custom BIOS by sigkill 25.05.2016 15:46

Hi @_nobody_ , Hi @CodeRush,

I'm the x220 owner who got the BIOS bricked.
Let me add some more details about the process:

1 - Laptop was with official BIOS_1.29 / EC_1.20;
2 - From windows, updated to official BIOS_1.40 / EC_1.24;
3 - From windows, installed custom 8duj26us_NWL_ADV_AES_PM_Speedo;
4 - Custom BIOS unlocked Advanced Menu (with tons of chipset related options);
5 - 2x8GB DDR3-1866Mhz modules installed. Changed RAM speed to 1866Mhz in BIOS;
6 - Booted to Archlinux and dmidecode reported 1333Mhz as RAM speed;
7 - I went back to BIOS and changed RAM speed to Auto and noticed that SR-IOV was not activated for PCI, so I decided to activate it since I plan to play a little with kvm and stuff (If I recall correctly, these were the only 2 changes that bricked the system).
8 - Save and exit: BIOS bricked. Infinite boot/restart loop until I remove ac/battery;
9 - Tried to remove all the hardware and clear CMOS. Nothing worked. Always in boot loop.

The flash dump (using flashrom) is here:
Let me know if you need any additional details.


#4 RE: ThinkPad x220: problem with a custom BIOS by cam234 14.07.2016 11:37

Just FYI to check actual memory bus speed you need software that "looks" at the actual chipset registers (on Windows that's CPU-Z, etc.); DMI/SMBIOS tables may or may not be updated by the BIOS with actual data. Or benchmark. Memory may well have been running at 1867 anyway...

I had a X220 until a few weeks ago, to be honest for higher speed memory support I just stuck with the older BIOS (1.37?) that did not limit the memory speed. I had good results with Camilomi's modified BIOSes though I think he only removed white-listing, did not add other features - but grew tired of the beeps at each boot.

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