Networking no longer possible after failed firmware update.

Hi.

Thank you for the detailed information and log output. This is very helpful in understanding the issue.

The key error in your tg3 driver output, "Could not obtain valid ethernet address, aborting," strongly indicates that the failed firmware update has corrupted the NIC's non-volatile memory where the MAC addresses and other configuration data are stored. The PCI bus can still enumerate the hardware because the device is physically present and functional at the electrical level, but the driver cannot initialize it because it cannot read a valid MAC address from the NIC's EEPROM or flash region. This is unfortunately a known consequence of an interrupted or failed NIC firmware flash.

There are a few things you can try before contacting support. First, try accessing the Lifecycle Controller by pressing F10 during boot and attempt a firmware update from there using the Platform Update or Firmware Update option. The Lifecycle Controller operates independently from the OS and iDRAC inventory and may be able to push the firmware to the device even though iDRAC no longer recognizes it. You can use a USB drive loaded with the firmware binary or point it to the Dell support site directly if you have network access through a separate interface.

Second, you could try downloading the Dell Platform Specific Bootable ISO for the R260 from the Dell support site using another machine, writing it to a USB drive, and booting from it. This bootable image performs its own hardware discovery and may be able to identify and reflash the NIC even in its current state.

Third, as a temporary workaround to regain network access in the OS while you work on resolving the firmware issue, you may be able to manually assign a MAC address to the interface in Linux. You would need to identify the interface names assigned to the PCI addresses using a command like "ls -la /sys/class/net/" to find which interfaces correspond to 0000:06:00.0 and 0000:06:00.1, and then use the "ip link set" command to assign a locally administered MAC address. However, please note that this is only a temporary workaround and does not fix the underlying firmware corruption.

If none of these approaches allow you to reflash the NIC firmware successfully, this situation will very likely require Dell ProSupport involvement. A support engineer may need to use specialized tools such as the Broadcom NIC configuration utility or BNXTMT to reprogram the NIC's EEPROM and restore the MAC addresses and firmware. If your server is under warranty or a ProSupport contract, please open a case with your Service Tag so that a technician can assist with the recovery. If the NIC flash memory is unrecoverable, a motherboard replacement may ultimately be necessary since the BCM5720 is an onboard LOM on the R260.

Let us know if there is anything else we can assist you with.

Thanks,

Josh

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