After verified with VMware team, here is a feedback

Please refer to the test result for VMWare ESXi6.0 U2 on B1SD2-TF.

VMware: Passed

VMware-VMvisor-Installer-6.0.0.update02-3620759.x86_64.iso (inbox drive no support Intel X552 still)

VMware-VMvisor-Installer-6.0.0.update02-3620759.x86_64.iso + ixgbe-4.4.1-2159203-3848596 (customized) (recognize Intel X552) (B1SD2-TF) (Install and work fine)

Customer needs to know how to build customized OS img to install ESXi6.0U2 with Intel X552 NIC.

The following steps for build customized OS img.

1. To download the NIC driver from vmware website.

http://www.vmware.com/resources/compatibility/vcl/result.php?search=x552&searchCategory=all


2. How to make your unsupported NIC work with ESXi 5.x or 6.0

http://www.v-front.de/2014/12/how-to-make-your-unsupported-nic-work.html


3. Create a custom ISO and inject the updated driver separately.

To manually create a custom ESXi 6.0 image, inject the driver and install the host:

Create a custom ESXi build using the ESXi-Customizer-v2.7.2 software.

Note: ESXi-Customizer is not a VMware product. You can download the software at ESXi-Customizer Downloads page.

ESXi-Customizer

http://www.v-front.de/p/esxi-customizer.html

ESXi-Customizer is a user-friendly script that automates the process of customizing the ESXi install-ISO with drivers that are not originally included. Unlike other scripts and manuals that are available for this purpose. ESXi-Customizer runs entirely on Windows and does not require any knowledge of or access to Linux.


Instructions

Download the latest version of the ESXi-Customizer script (see Download section below). Since version 2.0 it is distributed as a signed self-extracting archive (created with 7-zip). Unpack the archive to a directory of your choice.

Run ESXi-Customizer.cmd from the installation directory.

A GUI will show up that lets you select the original VMware install-ISO, the customization file and a working directory for the script.