Hi Timothy, On Tue, 21 Mar 2017 10:32:46 -0500 Timothy Pearson <[email protected]> wrote:
> -----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! > Unfortunately, I had the option already enabled when using the "config-unreliable" in my initial posting. So it looks like this setting is not effective in stopping the hangs. Cheers, Daniel -- coreboot mailing list: [email protected] https://www.coreboot.org/mailman/listinfo/coreboot
