Device Type:      ConnectX3Pro
  Part Number:      MCX312B-XCC_Ax
  Description:      ConnectX-3 Pro EN network interface card; 10GigE; dual-port SFP+; PCIe3.0 x8 8GT/s; RoHS R6
  PSID:             MT_1200111023
  PCI Device Name:  /dev/mst/mt4103_pci_cr0
  Port1 MAC:        ec0d9a00aab1
  Port2 MAC:        ec0d9a00aab2
  Versions:         Current        Available    
     FW             2.42.5000      N/A          
     PXE            3.4.0752       N/A

Flash UEFI firmware
Request UEFI firmware from support@mellanox.com
http://www.panticz.de/mellanox/firmware-update

Install MFT
http://www.panticz.de/install-mellanox-mft

Flash firmware

flint -y -d /dev/mst/mt4103_pci_cr0 -i firmware fw-ConnectX3Pro-rel-2_42_5000-MCX312B-XCC_Ax-FlexBoot-3.4.752-UEFI-14.11.46.bin b
Device Type:      ConnectX3Pro
  Part Number:      MCX312B-XCC_Ax
  Description:      ConnectX-3 Pro EN network interface card; 10GigE; dual-port SFP+; PCIe3.0 x8 8GT/s; RoHS R6
  PSID:             MT_1200111023
  PCI Device Name:  /dev/mst/mt4103_pci_cr0
  Port1 MAC:        ec0d9a00aab1
  Port2 MAC:        ec0d9a00aab2
  Versions:         Current        Available    
     FW             2.42.5000      N/A          
     PXE            3.4.0752       N/A          
     UEFI           14.11.0046     N/A

Fix iPXE boot issue (recompile ipxe.efi) when connected to LACP swith port
http://www.panticz.de/ipxe/compile

# disable NET_PROTO_LACP
diff --git a/src/config/general.h b/src/config/general.h
index 3c14a2cd..d860f450 100644
--- a/src/config/general.h
+++ b/src/config/general.h
@@ -38,7 +38,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #undef NET_PROTO_IPV6          /* IPv6 protocol */
 #undef NET_PROTO_FCOE          /* Fibre Channel over Ethernet protocol */
 #define        NET_PROTO_STP           /* Spanning Tree protocol */
-#define        NET_PROTO_LACP          /* Link Aggregation control protocol */

# compile
make bin-x86_64-efi/ipxe.efi

# deploy ipxe.efi
scp /tmp/ipxe/src/bin-x86_64-efi/ipxe.efi tftp.example.com:/tftpboot/