Re: [coreboot] t420 CPU Upgrade

[Zoran Stojsavljevic]

> If you have any other reading material on the entire process I would love

to see some more.

I will be not able to comply to entire process, but here is a bit more... I
guess, important below:

(finding CPUID [CPUID 0x306A9 (SR0MM)] on the following www page):
http://www.cpu-world.com/CPUs/Core_i7/Intel-Core%20i7-3720QM%20(BGA)%20Mobil...

Then, please, read this, in order to determine the latest MCU (seems
microcode-m12306a9_00000019):
https://www.coreboot.org/pipermail/coreboot/2014-January/077013.html

Good Luck! :-)
Zoran

On Sat, Aug 27, 2016 at 8:55 AM,  wrote:
> Awesome response to my question, thanks for breaking it all down.  I'm not
> as savvy as I'd like to be when doing these sort of modifications, so I'm
> trying to wrap my head around all of this.
>
> Where would one go about finding this MCU to be entered at config.  I
> really hope I can learn to understand this more to be fully prepared to
> tackle this job.
>
> If you have any other reading material on the entire process I would love
> to see some more.  It seems slightly too technical for me thus leading to
> my hesitancy towards flashing this.
> Aug 2016 22:57 by [e-mail]:
>
> Let us try to understand what is i7-3720QM for itself? To find out, we'll
> ask our good friend ark.intel.com:
> http://ark.intel.com/products/64891/Intel-Core-i7-3720QM-
> Processor-6M-Cache-up-to-3_60-GHz
>
> Important points: 4 (Quad) Core, 8 HTs, TDP 45W, DDR3/DDR3L 1333/1666MHz,
> GFX base FREQ 650MHz, GFX Device ID 0x0166 .
>
> As I see from: https://www.coreboot.org/Board:lenovo/t420
> vBIOS (64KB) file pci8086,0166.rom does exist, so GFX wise Coreboot is
> supported. I guess, IVB FSP does support as well i7-3720QM, with built-in
> MRC algorithms for DDR3 (1.5V) and DDR3L (1.35V) 1333/1666MHz.
>
> The only one thing here to take care of is new MCU to be entered in
> config: it is after all sku specific (new sku demands new MCU).
>
> And one more important point, economy wise, this sku costs around $350
> USD. If you do have these monies, IVB is 61% more PM efficient then its
> counterpart SNB (currently present in yout T420 laptop). :-)
>
> Good Luck!
> Zoran
>
> On Sat, Aug 27, 2016 at 6:08 AM,  wrote:
> > https://www.coreboot.org/Board:lenovo/t420
> >
> > How stable is the i7-3720qm CPU Upgrade in the t420?  You guys have it
> > listed under the tested portion.  I want to grab myself one, but would want
> > to see if it's worth my time to upgrade the CPU, or just go with something
> > more powerful.