Hi Hal et al., When I had this problem on an 8530p, I tried the following (unsuccessfully) to restore the machine to a state where it will boot:
> 1. Remove memory on left slot (as shown in DIMM1.jpg) and restart the unit. No change. > 2. Remove the memory on the right slot, replace it back and restart the unit (keep the left slot still empty). No change. > 3. Replace with memory on the right slot with another one that has a different frequency (e.g. if you have 800Mhz DIMM replace it with 667Mhz one). Keep the left slot still empty. I don't have a DIMM of a different speed lying around. I have one other model of HP laptop but it takes the identical stuff. I tried it anyways. No change. > 4. Remove the RTC battery (will find it next to DIMMs) and let it stay there for a while. After that connect it back and restart the unit. Left DIMM still out. I left the battery out for a few minutes and tried booting up with it removed. No change. I also removed the CD-ROM drive and tried again. No change. I left the battery out for about half hour, then put it back in, then tried booting up with the left DIMM still removed. No change. Cheers, -Jon Hal Finney wrote: > Thanks very much for the responses. Unfortunately I can't give you the > BIOS version because the machine is a brick. I am at a conference this > week so it may take a few days to get it fixed. > > The first time it broke I used the 20090330 version of tboot, with the > latest SINIT downloaded from SourceForge. The second time, this past > weekend, I believe I used tboot built from the mercurial tip, which I > had downloaded moments before. > > I am not sure how to proceed after I get my laptop fixed. I can tell > you what BIOS version is in the new one, but I will be hesitant to do > another run of tboot to see if it breaks it again. Last time, they > replaced the motherboard, so I don't expect that the new BIOS version > will necessarily be the same as the one that broke. > > As far as the hang, I believe it occured immediately after the > GETSEC[SENTER]. The display went blank. The one thing I noticed, at > least the second time, is that the disk drive light was flickering in > a smooth, uniform pattern. Maybe 30 times a second, just flickering on > and off uniformly. This kind of worried me as I wondered if the > failure mode was trashing my disk. After a few seconds, I pressed and > held the power button to turn the laptop off. Trying to turn it back > on led to the problem I described, where it repeatedly turns itself > back off (and back on). > > One question, would you think that removing and replacing the RTC > battery might clear enough internal state to let it boot? Any other > interventions or resets that might be possible if I take the laptop > apart somewhat? HP does have instructions to do so on the web site. > > Hal Finney > > On Mon, Aug 17, 2009 at 6:18 PM, Wang, Shane<shane.w...@intel.com> wrote: >> Hi Hal, >> >> The reset behavior seems like it is due to the secret flag of TXT. >> It looks like BIOS ACM does not clear the secret flag of TXT when hang and >> reset happen. >> >> What version of SINIT and tboot are you using on that laptop? >> What did you do to get hang? hang where? >> >> I am trying to find where the root cause is. >> >> Thanks. >> Shane >> >> Hal Finney wrote: >>> I was traveling recently, and I wanted to do some experiments with TXT >>> on the road, so I bought an HP laptop that supports the technology. It >>> is an HP EliteBook 6930p. I got it set up with Linux and tboot, >>> enabled TPM, VT and TXT, and tried booting tboot and a Linux kernel. >>> >>> Something went wrong. My laptop hung and I restarted it. But it didn't >>> start properly. The power light and other lights came on, but the >>> display did not light up. The fan started and disk began spinning, but >>> after about a second, the whole thing powered down. The fan and disk >>> stopped, and all of the lights went out. Then, after a few seconds, it >>> turned itself back on. But once again, after starting the fan and >>> disk, and before lighting the display, the laptop shut off. This cycle >>> would repeat indefinitely, the laptop turning itself on and off. I >>> have to make it stop by pressing and holding the power button. >>> >>> In short, my laptop was completely broken and useless. >>> >>> Fortunately, being new it was covered by HP's warranty. They talked me >>> through the usual minor fixits on the phone, removing the disk and >>> such, and nothing helped. They finally told me to take it to an >>> authorized repair shop. The nearest one is 80 miles away so it was not >>> super convenient, but I did it. Unfortunately it meant that I was not >>> able to take the laptop on my trip and was not able to do my >>> experiments. >>> >>> I got back this week and picked up my laptop from the repair shop. >>> They had replaced the motherboard and it worked fine. So I tried >>> again. I enabled the new TPM, got VT and TXT enabled, and tried >>> launching tboot. >>> >>> It broke again. >>> >>> Once again my laptop is useless. It repeatedly turns itself on and >>> off, and does not even light up the display. It does not get far >>> enough into BIOS to boot from a CD or any other medium. >>> >>> I am a little worried about once again demanding that HP fix this >>> machine under the terms of my warranty. I did not go into any detail >>> about what I was doing when it broke the first time. In fact I thought >>> it was probably just a defective machine; I did not necessarily >>> connect it that much with tboot since I was just getting started with >>> it and had only used it for an hour or so. But with the same thing >>> happening twice now, it is clear that I am breaking it. And I am not >>> running Windows, I am using experimental software, etc. Of course the >>> machine is claimed to support TXT, so obviously it should not break >>> from running tboot. But this is such a little-known and new technology >>> that I'm sure only a few people at HP are familiar with it. I am not >>> sure how to proceed with regard to the warranty. >>> >>> I wonder if anyone at HP reading this might be able to comment? It >>> will not be good if HP laptops are turned into bricks by running >>> tboot. >>> >>> Hal Finney >>> >>> ------------------------------------------------------------------------------ >>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 >>> 30-Day trial. Simplify your report design, integration and deployment >>> - and focus on what you do best, core application coding. Discover >>> what's new with >>> Crystal Reports now. http://p.sf.net/sfu/bobj-july >>> _______________________________________________ >>> tboot-devel mailing list >>> tboot-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/tboot-devel >> > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > tboot-devel mailing list > tboot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/tboot-devel > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ tboot-devel mailing list tboot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/tboot-devel
