to get POST codes is not necessary to have ipmi...just connect your display to vga port. you will then see codes (right corner at the bottom).Try to get into the IPMI and check the POST code in "POST Snooping"
i have h11dis board and using vga port. i can see all of POST codes.
but....i think his problem is ES cpu (engenieering samples)
here is a link (7 days available, after 7 days will be deleted) for H11 dsi bios's. i extracted them with the help of supermicro site script. those are my educated guess (using naming convention of supermicro)