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