Hello,
After searching a lot, and testing for hours, i've found something that doesn't seems to in this forum (if it is; sorry i haven't seen it)
I've found 2 PERC H310 inside the bin, and saw the fabulous REDPILL LOADER, so i decide to give both a try.
Got some usb stick and free disks, i first follow the classic H310 to 9211-8i IT firmware flash (google for it, it's pretty easy to do)
Tryed the redpill loader with my new HBA SAS2008 : worked !!!
BU
Remember, this is in proxmox vm, so yes there is a 6 port ahci on board, but its not pass thru to the vm, the vm node only has the 1 virtual qm emu hdd at 32gb set at slot #7, where the lsi card is pci pass thru to vm node and its starting at #15.
I do know, look at the picture from the lsiutil program (I posted this above also) shows port b cable p1 = disk 0 (to the lsi)
and port a cable p1 = 7
so, in this case according to the lsiutil to mapping is as follows