[LS1046A] Can't access PCI Express configuration area.

rfxiGEMmonot4r — Thu, 24 Mar 2022 14:15:08 GMT

Hi,

I just making my first steps in bare metal coding for the LS1046A SoC.

I have a working setup with the Freeway Board and CodeWarrior + Probe and I am able to debug C code.

The problems have started when I tried to initialize the PCIe.

As one of the first steps I wanted to access the PEX1 register on address 0x340_0000.

First I failed to access this address and the debugger seems to disconnect by stepping into this instruction by deref a pointer with 0x340_0000.

Then I kind of figured out that by setting the CSU_CSL registers to zero the debug session seems to be able to step over the instruction.

I set the following registers to zero:

CSL0, CSL3, CSL4, CSL8

Now I concentrated back on the PEX1 register and I was able read out a value. It was just 0x0000_0000 which was unexpected since in my opinion it should contain the Venor ID and Device ID with the reset value 0x81C0_1957 (QorIQ LS1046A Reference Manual Chapter 25.4.2.1). But it is still empty.

Now I am a little bit lost and I hope someone can help here.

Let me know if I shall provide additional information.

Thanks.

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[LS1046A] Can't access PCI Express configuration area.