Two more observations: (adding to my previous below email) 1) Centos 5.6 also showing the same ACPI errors as in CentOS 5.5 2)BIOS-E820 map has a difference in the first line: (0000000000010000 instead of 0000000000000000) ================================ - Centos-5.3 BIOS-E820 memory map is: BIOS-e820: 0000000000000000 - 000000000009e000 (usable) BIOS-e820: 000000000009e000 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000001fee9000 (usable) BIOS-e820: 000000001fee9000 - 0000000020000000 (reserved) BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved) 0MB HIGHMEM available. 510MB LOWMEM available. ================================ - Centos-5.5 BIOS-E820 memory map is: BIOS-e820: 0000000000010000 - 000000000009e000 (usable) BIOS-e820: 000000000009e000 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000001fee9000 (usable) BIOS-e820: 000000001fee9000 - 0000000020000000 (reserved) BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved) 0MB HIGHMEM available. 510MB LOWMEM available. ================================ Not sure this is why ACPI's root table is not able to find. Any comment/suggestion/pointers are really needed/appreciated. /Sri On Tue, Apr 26, 2011 at 7:14 PM, sri <bskmohan at gmail.com> wrote: > Hi Group, > > I was using centos 5.3 and trying to upgrade to 5.5. While installing 5.5 > it was showing ACPI related errors on the screen causing the installation > could not able to find PCI devices. > The same installation is working with Centos 5.3 without any problems. > Observed few ACPI related patches (amont 4500+ patches ) in the Centos5.5 > (kernel-2.6.18-194.32.1.centosplus.el5). > > Tried to remove those new ACPI patches (assuming they caused the problem) > but the rpmbuild process was throwing some patch dependency errors. > Attached are the config files and traces got while installing Centos5.3 and > Centos5.5 respectively. > > Any help/pointers is highly appreciated as this is showstopper for me. > > -- > -- > Sri > -- -- Krishna Mohan B -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20110426/ffeb10f3/attachment-0004.html>