-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 03/12/2017 07:58 PM, Daniel Kulesz via coreboot wrote: > Hi folks, > > as reported, the KGPE-D16 was mostly unusable for me in my 2x Opteron 6276 + > 128 GB RAM configuration as it simply did not boot reliably - even with > serial console debugging disabled completely. After experimenting with > various config options and comparing my best "known half-working" config from > earlier attempts, I finally found out that the hangs were related to the > configuration and not to a specific coreboot version. > > I attached the configs showing my current "reliable" setup (that survived 10 > cold and 10 warm reboots without a single hangup!) and one of the previous > "unreliable" setups which often needed several cold boots to successfully > boot up once. There are several options which might be reposible for these > hangs. Personally, I believe what helps is to completely disable the serial > console and not just disable debugging to serial console. > > As asked for previously, I also took some boot time measures from pressing > the power button to "grub beep" in my 128 GB RAM configuration. Here they are: > > vendor bios, unoptimized with iPXE setup: 59s > coreboot, current with the "reliable" config: 73s > coreboot, Jan 17 2017, with the "reliable" config: 91s > coreboot, current with the "unreliable" config: 131s > > I assume that further investigation of the root cause could help to locate > the real bug (like e.g. the setup of the serial console). Yet, I hope that > having a "working-good" config will be useful for people suffering from the > same issue as I did. For me, this setup is still far from being what I > expected (memory is clocked too low and idle power consumption is 170W > instead of 90W), but at least the machine boots up reliably every time now. > > Cheers, Daniel >
Could you verify something for me? In internal tests it looks like setting CONFIG_SQUELCH_EARLY_SMP resolves the hang with the serial console enabled, but I need secondary verification of this due to the intermittent nature of the problem. You seem to be hardest hit by the bug so your system should make a good test case. Thanks! - -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 (direct line) +1 (512) 690-0200 (switchboard) https://www.raptorengineering.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJY0UeaAAoJEK+E3vEXDOFb+jQH/3XyDMu1xeiXDxT2TA8/1Tl+ BSUk/gsplKL2LJBE54g/XdIl3jsP4oNAItvzJEUIY+dLzVZAXwgrRwK5TxPlXI3f kFNYF5zfq8sJZkVsHthhlgda2OoSBzod4KTHgi8TcpdtvOun492zovDn8HfJpdl7 MGVjFr7s5Ap85hQ6x1gFD52mK5wJALStRmAIO+ViuTdp8xCMB2xa2h8umD3pEzSL DV0tVBmw0oAnTJu1xogF1z5iXdREJz6TuvleUKOiE3jy/sQr/onMiML0PS+GTjIb qeqRpSxL4pBNHDEbeB9Coe9V2uE7WJ9Zjt4aC0MvRrckeh/cl+tnwpr+MGSrYJ4= =JEl+ -----END PGP SIGNATURE----- -- coreboot mailing list: [email protected] https://www.coreboot.org/mailman/listinfo/coreboot
