From Bugzilla Helper: User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322) Description of problem: In order to boot up IA32 Xen0, I have to add pci=noacpi as the boot parameters of Xen0 kernel, or system will hang when initial PCI. My test machine mainboard is Intel 915. It can support x86 and x86-64 modes. Its BIOS firmware ID is: VVTGDI6A.86A.8039.2005.0516.0949 Its CPU is HT enabled. Processor serial: 0000-0F46-0000-0000-0000-0000 # cat /proc/cpuinfo vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Genuine Intel(R) CPU 3.80GHz stepping : 6 cpu MHz : 3793.088 cache size : 2048 KB fdiv_bug : no hlt_bug : yes f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cid cx16 xtpr lahf_lm bogomips : 9490.72 Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Install FC5-Test2 2. Install Xen RPMs 3. Reboot Machine and select to Xen. Actual Results: If not give extra pci=noacpi, xen0 boot will hang at initial PCI. And after give pci=noacpi, Xen0 can boot up. Additional info:
*** This bug has been marked as a duplicate of 180126 ***