https://blog.csdn.net/xzknet/article/details/53675595 主板dmi信息



    金手指信息：
    https://pinouts.ru/Slots/pci_express_pinout.shtml
    side A： 短边靠左，长边靠右，左上角。
    Transmitter Lane 0, Differential pair 代表 主机端发送
    Receiver Lane 0, Differential pair 代表主机端接收



    set dbi
    set 0x030008bc to 0x0006ff49


    set to x1 mode
    0x03000710 defatul:0x001f0120 ,change : 0x10120
    0x0300080c default:0x000310ff, change : 0x301FF
    0x0300007c default:0x00433d04, change : 0x433C14


    1. 0x02c40008 set 0
    2. wait 0x02c013c0, 0x02c113c0, 0x02c213c0, 0x02c213c0 to 1
    3. set dbi, set x1 mode
    4. 0x02c40008 set 2
    #5. wait 0x02c013c0, 0x02c113c0, 0x02c213c0, 0x02c213c0 to 1
    6. set 0x02c00c90 to 0x0, wait ltssm 0x2010
    7. set 0x02c00c90 to 0x20, wait itsm 0x2018