On Thu, 8 Sep 2016 19:25:15 +0800 Iru Cai <[email protected]> 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 <[email protected]> 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 > > -- coreboot mailing list: [email protected] https://www.coreboot.org/mailman/listinfo/coreboot
