Hi Iru, >From T420 manual [1]: "Memory: Up to 8GB DDR3 - 1333MHz (2 DIMM Slots)"
While it seems possible to use 16GB (2x 8GB), it isn't possible to use 16GB DIMMs. I haven't tested by myself, but it seems like a hardware limitation. Please provide raminit logs, just to make sure. Regards, Patrick [1] http://www.lenovo.com/shop/americas/content/pdf/notebooks/ThinkPad/t-series/ThinkPad%20T420-T520.pdf On 2016-05-31 05:04 AM, Iru Cai wrote: > Hi, > > I'm tesing to see if the coreboot Sandy/Ivy MRC supports 16GB DIMMs. > Here's my result. > > I'm using a MT16KTF2G64HZ-1G6A1[1]. My machine is Lenovo T420 with > i7-3630QM. With this module inserted (I've tested 16G+0 and 16G+8G), > the system can light up, but it'll then get crashed. > - with GRUB2 payload, it'll crash after the payload loads > - with SeaBIOS payload with proprietary VGABIOS, I can see the prompt, > and can boot to a GRUB or syslinux loader on my USB stick, but when I > try to boot a system, it get crashed. If I boot to Memtest86+ on my > USB stick, the system will crash when memtest starts to test the > memory. > > And another thing I can see is, the first boot can boot to payload, > but the second boot will fail. I think it's caused by the MRC cache. > > I'm still wondering if Sandy/Ivy northbridge can support 16GB DIMMs. > I'll give a more detailed EHCI debug output later. According to [2], I > think the incompatibility is an MRC issue instead of hardware > incompatibility. > > [1] > https://www.micron.com/parts/modules/ddr3-sdram/mt16ktf2g64hz-1g6?pc={E1D8F1A9-3DFC-4BD2-8A1E-C26ED261EB0A} > [2] > http://www.intelligentmemory.com/fileadmin/download/compatibilitylist.pdf > > Iru. -- coreboot mailing list: coreboot@coreboot.org https://www.coreboot.org/mailman/listinfo/coreboot