Hi, I have collected a bunch of old PII PCs that I am trying to PXE boot. There NICs are old and so I use etherboot floppy to emulate a native PXE boot. I have configured tftp, dhcpd, pxelinux, and all the other stuff. Everything works fine till pxelinux start booting. Then it stucks after printing the IP row. --------------- pxelinux output ----------------------- PXELINUX 3.10 2005-08-24 Copyright (C) 1994-2005 H. Peter Anvin UNDI data segment at: 0009D400 UNDI data segment size: 1000 UNDI data segment at: 0009E400 UNDI data segment size: 0AB0 PXE entry point found (we hope) at 9E40:0680 MY IP address seems to be C0A800FC 192.168.0.252 ip=192.168.0.252:192.168.0.1:0.0.0.0:255.255.255.0 --------------- pxelinux output --------------------- After downloading and struggling a bit with pxelinux assembler code, I found out the problem: on the top of the file cpuinit.inc that is included from pxelinux.asm, the instruction "int 16h" causes havoc on my pc. Literally, a single instruction causes the whole pc to hang. Amazing! Would have never believed that. Anyhow, I disabled this instruction, compiled, and ran pxelinux and things went fine till it tried to download the kernel. For some reason, tftp refused to give the kernel, with permission denied. Digging more, I found that this is related to something called "checksum offload" and accompanied with a checksum error. I have also noticed that my pc's keyboard does not function at all once pxelinux starts executing. Now I am not sure how to proceed. I am also wondering if the instruction "int 16h" has such a far reaching effects. Could it be the reason for the failing checksum and the not responding keyboard (after all it managed to stuck my whole pc)? To be concluded. Firas. -- Firas Swidan, PhD Founder and CEO Olymons: Blessing Machines with Vision (TM) http://www.olymons.com P.O.Box 8125 Nazareth 16480 Israel Cell: +.972.(0)54.733.1788
Firas Swidan, PhD wrote:> > After downloading and struggling a bit with pxelinux assembler code, I > found out the problem: on the top of the file cpuinit.inc that is > included from pxelinux.asm, the instruction "int 16h" causes havoc on my > pc. Literally, a single instruction causes the whole pc to hang. > Amazing! Would have never believed that. Anyhow, I disabled this > instruction, compiled, and ran pxelinux and things went fine till it > tried to download the kernel. For some reason, tftp refused to give the > kernel, with permission denied. Digging more, I found that this is > related to something called "checksum offload" and accompanied with a > checksum error. I have also noticed that my pc's keyboard does not > function at all once pxelinux starts executing. > > Now I am not sure how to proceed. I am also wondering if the instruction > "int 16h" has such a far reaching effects. Could it be the reason for > the failing checksum and the not responding keyboard (after all it > managed to stuck my whole pc)? >Yes, INT 16h is calling the keyboard BIOS, and apparently your keyboard BIOS is screwed. -hpa
Op 14-11-2007 om 23:24 schreef Firas Swidan, PhD:> Hi, > > I have collected a bunch of old PII PCs that I am trying to PXE boot. > There NICs are old and so I use etherboot floppy to emulate a native PXE > boot. I have configured tftp, dhcpd, pxelinux, and all the other stuff. > Everything works fine till pxelinux start booting. Then it stucks after > printing the IP row. > > --------------- pxelinux output ----------------------- > > PXELINUX 3.10 2005-08-24 Copyright (C) 1994-2005 H. Peter Anvin > UNDI data segment at: 0009D400 > UNDI data segment size: 1000 > UNDI data segment at: 0009E400 > UNDI data segment size: 0AB0 > PXE entry point found (we hope) at 9E40:0680 > MY IP address seems to be C0A800FC 192.168.0.252 > ip=192.168.0.252:192.168.0.1:0.0.0.0:255.255.255.0 > > --------------- pxelinux output ---------------------Hey, there was few days ago a simular posting ...> After downloading and struggling a bit with pxelinux assembler code, I > found out the problem: on the top of the file cpuinit.inc that is > included from pxelinux.asm, the instruction "int 16h" causes havoc on my > pc. Literally, a single instruction causes the whole pc to hang. > Amazing! Would have never believed that. Anyhow, I disabled this > instruction, compiled, and ran pxelinux and things went fine till it > tried to download the kernel. For some reason, tftp refused to give the > kernel, with permission denied. Digging more, I found that this is > related to something called "checksum offload" and accompanied with a > checksum error. I have also noticed that my pc's keyboard does not > function at all once pxelinux starts executing. > > Now I am not sure how to proceed. I am also wondering if the instruction > "int 16h" has such a far reaching effects. Could it be the reason for > the failing checksum and the not responding keyboard (after all it > managed to stuck my whole pc)?See at least http://en.wikipedia.org/wiki/BIOS_interrupt_call for more information about "int 16h"> To be concluded. > > Firas.Cheers Some one who assumes that a poster to the mailinglist is subscribed AND that he/she reads the mailinglist replies.