Yokemate of Keyboards
Posts: 12075 from 2003/5/22
From: Germany
>> The block diagram looks good :-)
> Yeah, I think so too.
According to the block diagram, there's SATA2 connected (for whatever reason) and the 4 PCIe controllers are configured with 9 lanes as x4-gen3 (MXM/GPU) x2-gen2 (4×SATA3) x2-gen2 (MiniPCIe/LTE/WiFi) x1-gen2 (4×USB3).
I just had a closer look at the SerDes lane assignment options of the T2080:
https://lists.denx.de/pipermail/u-boot/2013-November/167690.htmlhttps://lists.denx.de/pipermail/u-boot/2014-May/179996.html (for completeness sake)
To me it seems the T2080 offers three better PCIe options, so that only the fourth-best option would be the one chosen by ACube:
14 PCIe lanes (x4 x4 x4 x2) without SATA2 (using 0xBC + 0x1F config)
12 PCIe lanes (x4 x4 x2 x2) with SATA2 (using 0xBC + 0x15/0x16 config)
11 PCIe lanes (x4 x4 x2 x1) without SATA2 (using 0xC8/0xD6 + 0x1F config)
09 PCIe lanes (x4 x2 x2 x1) with SATA2 (using 0xC8/0xD6 + 0x15/0x16 config)
