• Yokemate of Keyboards
    Yokemate of Keyboards
    Andreas_Wolf
    Posts: 11157 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.html
    https://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)
  • »16.11.17 - 22:47
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