Known issues:
SIS900 network card (Note: SIS191 has same problem, however, since Etherboot/gPXE does not support SIS191, this workaround won't work for SIS191):

sis900 client does NOT work with pxelinux >=3.07 simple menu, it will hang like this: http://drbl.sf.net/screenshot/?in_path=/00_DRBL#xxx-sis900-client-hang.jpg you WON'T see this:
http://drbl.sf.net/screenshot/?in_path=/00_DRBL#syslinux_drbl.jpg The client will hang before this.
It's reported to:
http://syslinux.zytor.com/archives/2005-April/005030.html

There IS a workaround (Thanks to Alexander Heinz for providing that in syslinux mailing list):

  1. Install DRBL version 1.5.8-1 or newer one, finish all the setup.
  2. Find your SIS900 Clients' MAC vendor prefix, for example, if their MAC addresses are AA:BB:CC:DD:XX:YY, the MAC vendor prefix is AA:BB:CC.
  3. Modify the file /etc/dhcpd.conf (RH-like) or /etc/dhcp3/dhcpd.conf (Debian based):
    #if substring (option vendor-class-identifier, 0, 3) = "PXE" { # # ************************************************************** # # ***MODIFY*** the MAC vendor prefix of client network card here. # # ************************************************************** # # For annoying sis900 network card, maybe it's 00:07:95, 00:0C:6E... # if substring (hardware, 1, 3) = 00:0C:6E { # # eb-5.4.3-etherboot-pci.zpxe is a all-in-one pxe image, works for most NIC. # # sis900.zpxe is specially for sis900 NIC. # # Try either one. # #filename = "eb-5.4.3-etherboot-pci.zpxe"; # filename = "sis900.zpxe"; # } #}
    uncomment the "if block", and change the MAC vendor prefix to yours. In this example, we use AA:BB:CC like this:
    if substring (option vendor-class-identifier, 0, 3) = "PXE" {

    # ************************************************************** # ***MODIFY*** the MAC vendor prefix of client network card here. # ************************************************************** # For annoying sis900 network card, maybe it's 00:07:95, 00:0C:6E... if substring (hardware, 1, 3) = AA:BB:CC {

    # eb-5.4.3-etherboot-pci.zpxe is a all-in-one pxe image, works for most NIC. # sis900.zpxe is specially for sis900 NIC. # Try either one. #filename = "eb-5.4.3-etherboot-pci.zpxe"; filename = "sis900.zpxe"; } }

  4. restart dhcpd service, like "/etc/init.d/dhcpd restart" (RH-like) or "/etc/init.d/dhcp3-server restart".
  5. Start your annoying sis900 box! It should work now.

Updated on Dec/13/2014.