[coreboot] anyone use coreboot on Lenovo T520?

[Patrick Rudolph]

On Thu, 8 Sep 2016 19:25:15 +0800
Iru Cai <mytbk920423 at gmail.com> wrote:

> Hi Patrick,
> 
> On Wed, Sep 07, 2016 at 05:36:45PM +0200, Patrick Rudolph wrote:
> > On Wed, 7 Sep 2016 21:15:05 +0800
> > Iru Cai <mytbk920423 at gmail.com> wrote:
> > 
> > Hi Iru,
> > I've got a T520 with soldered pin header as in the referenced wiki
> > page, and I've got a T420 where I had to use 10cm long wires to
> > place the pin header near the RAM slots to make it accessible
> > through the bottom flap. 
> 
> I never solder pins on T420, and have no such problem. Maybe there's
> something to do with my soldering skills.
> 
> > I've got no problems using both devices.
> > 
> > Can you give more information where the system hangs ?
> > Does it hang in coreboot? Does it occur after hours running the
> > system ?  
> 
> The machine boots fine to Linux, but it can freeze after some time,
> and I can't predict when this will happen.

You can try to limit DDR frequency using devicetree's max_mem_clock_mhz
setting. Vendor BIOS uses 666 here.

You can try to limit CPU pstate. It looks like the vendor BIOS doesn't
expose the highest pstate at all. I haven't looked at this, but I guess
it's to decrease power consumtion when running on battery.

I've never had any problem using coreboot on my T420.
You can find the commit here:
https://www.coreboot.org/Supported_Motherboards#lenovo.2Ft420

> 
> > 
> > Regards,
> > Patrick
> >  
> 
> Regards,
> Iru
> 
> > > Hi community,
> > > 
> > > I've had this problem for a long time, but I don't feel like to
> > > ask it until some one ask me about this problem.
> > > 
> > > Lenovo T520 has a BIOS chip under the magnesium structure frame,
> > > and it may have a WSON package, so I solder a pin connector at
> > > the `J100' solder place.
> > > (https://www.coreboot.org/Board:lenovo/t520#Flashing) However, I
> > > don't know whether it can cause problems. I flashed two pieces of
> > > T520 mainboard (without nVIDIA GPU) before, and after it had
> > > coreboot installed, the system could hang randomly, I don't know
> > > what had happened. I hadn't tested it with the pin connector
> > > soldered and factory firmwae.
> > > 
> > > So I hope some one with this laptop can report some status in
> > > using.
> > > 
> > > Regards,
> > > Iru  
> >