AnsweredAssumed Answered

PCIe 2 root complex doesn't exist in P2020

Question asked by Ivan Chen on Feb 14, 2019
Latest reply on Feb 17, 2019 by Ivan Chen

Hi all,


We are trying to modify the IO port selection from 1111( PCIe1 (x2) ) to 1110(PCIe1 (x1), PCIe2 (x1)).

When we boot up, we can see PCIe 1 has changed to x1, there's no root complex of PCIe2 in U-boot and linux kernel.


U-boot log:

PCIe1: Root Complex of Slot 2, x1 gen1, regs @ 0xffe0a000
01:00.0 - 14e4:b850 - Network controller
PCIe1: Bus 00 - 01


We check the registers of PCIe2, and all of them are zeros.

U-Boot> md 0xffe0a000  -> PCIe1
ffe0a000: 8001ff00 ffffffff 00000000 0010ffff


U-Boot> md 0xffe09000 -> PCIe2
ffe09000: 00000000 00000000 00000000 00000000



[root@p2020 ~]# lspci
00:00.0 PCI bridge: Freescale Semiconductor Inc Unknown device 0070 (rev 21)
01:00.0 Ethernet controller: Broadcom Corporation Unknown device b850 (rev 03)


Does anyone know about this? Any help is much appreciated.