PCie in P2020

monalihaware — Thu, 03 Dec 2020 09:21:32 GMT

I have P2020 RDB to which i have connected a miniPCIe board on which 2 ICs are there.

I am able to access the mini pCie device in uboot log as shown-

PCIe1: Root Complex of mini PCIe SLOT, x1, regs @ 0xffe0a000
01:00.0 - 104c:8240 - Bridge device
02:00.0 - 4ddc:1a00 - Simple comm. controller
02:01.0 - 4ddc:1a00 - Simple comm. controller

And further command show in the log as follows-

pci header 02.00.0
vendor ID = 0x4ddc
device ID = 0x1a00
command register = 0x0006
status register = 0x02a0
revision ID = 0x10
class code = 0x07 (Simple comm. controller)
sub class code = 0x80
programming interface = 0x00
cache line = 0x08
latency time = 0x80
header type = 0x00
BIST = 0x00
base address 0 = 0x80000000
base address 1 = 0x80040000
base address 2 = 0x00000000
base address 3 = 0x00000000
base address 4 = 0x00000000
base address 5 = 0x00000000
cardBus CIS pointer = 0x00000000

I want to access the registers inside the device at "2.00.0". Seeing the BAR0, I gave the following command-

md 0x80000000 10.

Is it correct way to access the registers inside the pCIe device? How do i know whether i am accessing correct memory address. Can anyone tell.

Re: PCie in P2020

ufedor — Thu, 03 Dec 2020 10:18:18 GMT

> Does the commands give registers inside the ICs connected to miniPCIe
No.

To determine how PCIe EP memory is mapped into the P2020 local address space you have to read the P2020 PCIe Outbound ATMU registers values.

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PCie in P2020

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