centos-bounces at centos.org wrote: > But what could be the cause for throwing this ACPI errors? I've had acpi errors like the ones you list, that went away when I installed SL6.0 Before then I had to boot acpi=off. Your board is not SMP and does not support ACPI. >> following errors were shown up(highlighted in bold & red color) Since my mail reader translated HTML to plain text, I see nothing in bold nor in red. Generally, people on mailing lists prefer plain text to HTML mail. >> Using APIC driver default >> ACPI: Unable to locate RSDP Put 'acpi=off' in the boot line since your hardware has no ACPI. >> 20000000:dff00000) Detected 1000.103 MHz Celeron processor. >> switching to UP code You don't need an SMP kernel, you have 1 CPU with 1 core only. >> PCI: No IRQ known for interrupt pin A of device 0000:00:02.0. Please >> try using pci=biosirq. >> PCI: No IRQ known for interrupt pin A of device 0000:00:03.0. Please >> try using pci=biosirq. There's a suggestion I'd follow: boot line should have acpi=off pci=biosirq Since you're building your own kernel, you can switch off SMP and ACPI. Likely APIC and IO_APIC also. Since you have only 1/2GB RAM, I'd switch off things I wasn't going to use. -- Insert spiffy .sig here: Life is complex: it has both real and imaginary parts. //me ******************************************************************* This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept for the presence of computer viruses. www.Hubbell.com - Hubbell Incorporated**