Hi All, I'm modifying the broadcom 57712 driver and i'm facing some weird inconsistent issues with this card. Here is what i've found out thus far and need your advice on this. I'm running a custom OS over a hypervisor and this OS is configured to use the 57712 card for FE connectivity. The problem is that every alternate shutdown causes a panic. (mind you i'm shutting down only the VM ) . To be more clear, when i first boot the VM everything is fine but when i try to shutdown the VM and then reboot it, i see that i get a 'BAD MCP validity signature' error and the 57712 firmware dumps core. Through my investigation into this issue what i've found out is that the *shared memory regions which are are used to find out the MCP value are getting changed when i reboot the VM.* The surprising part is that the addr location is obtained correctly on every alternate reboots. First reboot fails, second reboot works, third fails and so on. (if not anything at least this is a consistent behavior). As a fix to this problem whenever the MCP is returned as bad i tried to re-initialize MCP , and when i ran that code i get another error stating "MCP not up" and again the firmware dumps . (Should i increase the delay in waiting for the the register writes to happen as i'm in a virtual env?). So as a test, i obtained the addr that was being returned on a successful boot and tried to hard code it in case i'm not looking at that register . This time the "BAD MCP" issue didn't occur however later down in the boot sequence things got messed up totally becuase of my hard coding i guess and i had a totally different failure. Can anyone point me in the right direction, or if what i've done (by re initializing MCP) was correct but may be it needs more work ? Thanks Shampavman