Date: Tue, 4 Nov 2008 12:10:04 -0500 From: John Baldwin <jhb@freebsd.org> To: Jeremy Chadwick <koitsu@freebsd.org> Cc: Kevin <k@kevinkevin.com>, freebsd-stable@freebsd.org Subject: Re: DL360 G3 w/ AMD64 Cant boot from CD Message-ID: <200811041210.04875.jhb@freebsd.org> In-Reply-To: <20081104164131.GA52756@icarus.home.lan> References: <000001c93e35$9d456790$d7d036b0$@com> <001b01c93e98$fe2e7b60$fa8b7220$@com> <20081104164131.GA52756@icarus.home.lan>
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On Tuesday 04 November 2008 11:41:31 am Jeremy Chadwick wrote: > On Tue, Nov 04, 2008 at 11:18:36AM -0500, Kevin wrote: > > > > I tried 7.1-BETA2 , but unfortunately the same problem happened. I > > > tried > > > > (for the sake of argument) Debian debian-40r5-amd64 , and it wouldn't > > > boot > > > > either -- it said "Your CPU does not support long mode, please use a > > > 32bit > > > > distribution". > > > > > > This means your processor does not support 64-bit mode. > > > > > > > How would I support over 4GB of ram with only i386 distributions? > > > > > > There is only one option: use PAE mode, which has drawbacks. You can > > > read about what PAE is on Wikipedia. > > > > > > Note that not all drivers are PAE mode compatible on FreeBSD. You > > > should be able to install i386 FreeBSD with success, then rebuild your > > > kernel with PAE enabled. Look at /sys/i386/conf/PAE for an example > > > configuration -- you'll see all of the drivers you have to disable for > > > PAE to work successfully. If your system uses any of these drivers, > > > PAE > > > mode will not work for you, in which case you should upgrade your > > > hardware. > > > > > > -- > > > | Jeremy Chadwick jdc at parodius.com | > > > | Parodius Networking http://www.parodius.com/ | > > > | UNIX Systems Administrator Mountain View, CA, USA | > > > | Making life hard for others since 1977. PGP: 4BD6C0CB | > > > > > > Is my issue related to non-supporting of 64bit mode (2x Dual Xeons in the > > DL360 G3) , or perhaps due to a boot loader bug? > > > > I found this PR : > > > > 91492 freebsd- amd64 feedback serious medium current-us [boot] BTX > > halted > > There have been a number of recent reports of "BTX halted" on all sorts > of hardware. So far each problem has been unique; there doesn't appear > to be a "thing" that explains it for everyone. > > > In any case , the latest 6.4/7.1 Snapshot produced the same BTX Halt error. > > I'll just use i386 w/ PAE for now I suppose. I haven't tested AMD64 with > > DL360 G4's or DL360 G5's , but I'd appreciate if anyone has tested those > > generations w/ FreeBSD AMD64 , to let me know if the problem persists in > > some form. > > John Baldwin will have to correct me if I'm wrong, but I'm fairly sure > the FreeBSD bootstraps operate in pure i386 real mode up until > boot2/loader. John, can you confirm? Yes, the BTX fault you are getting is from trying to start 64-bit mode on a CPU that doesn't support 32-bit mode. The latest snapshots should have a fix where you get a more helpful "Your CPU doesn't do 64-bit" message. -- John Baldwin
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