On Wed, 21 Nov 2018 11:21:40 PST (-0800), address@hidden wrote:
> On Wed, Nov 21, 2018 at 11:19 AM Logan Gunthorpe <address@hidden> wrote:
>>
>>
>>
>> On 2018-11-21 12:16 p.m., Alistair Francis wrote:
>> >>> Do you see the MicroSemi PCIe probe in your dmesg?
>> >>
>> >> I do when I have a kernel with microsemi PCI Support (specifically the
>> >> one included in the bbl you sent us a while back).
>> >
>> > Yeah, so you need to make sure that doesn't happen.
>>
>> Well, I also have a kernel (one I've built myself) without microsemi
>> support, but with Xilinx support and it also doesn't work (see my dmesg
>> logs I sent).
>
> So this one should work.
>
>>
>> > For people who have modified the standard bbl to edit the device tree
>> > before passing it to Linux to add the MicroSemi PCIe node, it won't
>> > work. That's a very small number of people who have modified the
>> > standard boot loader. I don't think we need to document how those
>> > people get back to the default set-up.
>>
>> I have not done that. And it's not working for me.
>
> If you haven't done this then how can Linux know to probe the
> MicroSemi PCIe root complex?
BBL passes this through from the FSBL, which has the DTB compiled in:
https://github.com/sifive/freedom-u540-c000-bootloader/blob/master/fsbl/ux00_fsbl.dts#L405