I have two system based on dual XEON + intel 5400 chipset one DELL T7400 and another one based on a TYAN Tempest i5400 mobo (don't be jealous they're not mines). They run FEDORA 10 up-to-date (kernel are 184.108.40.206-170.2.56.fc10.i686.PAE) just fine for a while now, the only thing it's that they never reboot.
If I run the "reboot" command, they never start again, I have to press a long time the power switch to stop them and power on again.
On the TYAN mobo, I can see that the POST goes until the extended memory test then go back to the POST beginning and loop undefinitly...
I take a (quick) look into the TYAN BIOS setup but I don't find anything revelant until now, but as I'm not a hardware expert I'm maybe missing an important option to set.
For the DELL bios setup, which is more straightforward (there's far less option we can set), I found nothing too.
In the "dmesg" of the TYAN system I've these warnings / errors:
Phoenix BIOS detected: BIOS may corrupt low RAM, working it around.
last_pfn = 0x140000 max_arch_pfn = 0x1000000
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
mtrr: your BIOS has set up an incorrect mask, fixing it up.
kernel direct mapping tables up to 38000000 @ 10000-15000
NX (Execute Disable) protection: active
pci_express 0000:0a:02.0:pcie21: allocate port service
aer 0000:00:01.0:pcie01: AER service couldn't init device: no _OSC support
aer 0000:00:05.0:pcie01: AER service couldn't init device: no _OSC support
aer 0000:00:09.0:pcie01: AER service couldn't init device: no _OSC support
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
input: Macintosh mouse button emulation as /devices/virtual/input/input2
Driver 'sd' needs updating - please use bus_type methods
Driver 'sr' needs updating - please use bus_type methods
ata_piix 0000:00:1f.1: version 2.12
microcode: CPU7 updated from revision 0x0 to 0xa07, date = 04092008
p4-clockmod: Unknown p4-clockmod-capable CPU. Please send an e-mail to <firstname.lastname@example.org>
Bluetooth: SCO socket layer initialized
mtrr: type mismatch for d8000000,2000000 old: write-back new: write-combining
eth0: no IPv6 routers present
(the full dmesg output is attached).
I don't know where to start looking at. Does anybody have an idea?
Tell me if you need that I cat some "proc" or "sys" files.
One last precision, I've updated the DELL BIOS, I will see if there's an update for the TYAN one.