Dear Tapan, Another solution to have your 537 modem board recognize by the 537EP driver would be to modify those lines in 8250_pci.c source code to add in your modem board: static const struct pci_device_id softmodem_blacklist[] = { { PCI_VDEVICE(AL, 0x5457), }, /* ALi Corporation M5457 AC'97 Modem */ }; As your 537 modem supplier has no ID in /lib/modules/`uname -r`/build/include/linux/pci_ids.h It would then read: static const struct pci_device_id softmodem_blacklist[] = { { PCI_VDEVICE(AL, 0x5457), }, /* ALi Corporation M5457 AC'97 Modem */ #ifdef __i386__ /* Silicon 537 [Winmodem] ( check with /sbin/lspci -nn -Q if values correct) */ { PCI_DEVICE(0x1543,0x3052),0,0,}, #endif }; Next you would rebuild your kernel. Without rebuilding the kernel, I do not know what if you blacklist the 8250_pci driver in /etc/modprobe.d/blacklist and then reboot. This is a quick test which ought to worth to give it a try. Yours sincerely, - http://vouters.dyndns.org:8080/ Philippe Vouters (Fontainebleau/France) Le samedi 20 juin 2009 à 00:04 +0200, Philippe Vouters a écrit : > Dear Tapan, > > The goal would eventually be to build a kernel without > CONFIG_SERIAL_8250_PCI support. See > http://cateee.net/lkddb/web-lkddb/SERIAL_8250_PCI.html > Regards, > - > http://vouters.dyndns.org:8080/ > Philippe Vouters (Fontainebleau/France) >