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<indy>
hi all, there is something wrong with pcie initialization code for rockchip, i can boot from nvme with preempt_rt kernel and non-preempt_rt kernel
<indy>
5.10-rc6 kernels from debian
<indy>
but
<indy>
that nvme is pcie x4 gen2
<indy>
but
<indy>
when trying to play with wch368 pcie x1 card of unknown generation, kernel freezes on rt kernel. no panic, only freezes after i enter userid and press enter on login (serial)
<indy>
but in uboot i can run pcie list and pci commands
<indy>
unfortunately atf/u-boot/kernel do not enable clocks for coresight/debug so no way to use jtag yet
<indy>
kdump/kexec i'm not able to get working on aarch64
<indy>
oh - board is rock pi 4b
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<robmur01>
yeah, RK3399's PCIe doesn't like bridges - there were a couple of threads about that on the mailing list a while back
<robmur01>
U-Boot doesn't appear to try looking at what's *beyond* the bridge, but it's those accesses that are the problem
<robmur01>
(IIRC, essentially the root complex is supposed to handle a PCIe Unsupported Request coming back from the config access, but instead just forwards it into SoC interconnect as a fatal system error)
<robmur01>
long story short; certain cards just aren't ever likely to work
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<indy>
robmur01, what you mean "U-Boot doesn't appear to try looking at what's *beyond* the bridge"?
<indy>
oh i see, pci list just displays vid;pid of pci bridge 1d87:0100
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<robmur01>
oh wait, sorry, I misread - I assumed your card had a bridge with an endpoint attached on its secondary side
<robmur01>
but that's just U-Boot showing the root complex (since the host bridge is still a type of bridge) with no suggestion of any devices being attached to it at all
<robmur01>
so probably your device is attached directly to bus 0, and Linux blows up trying to probe for implemented functions
<robmur01>
unfortunately that's another facet of the same problem - some cards return different responses for unimplemented functions than others, and the RC only handles some of them correctly
<robmur01>
TBH I think the most telling thing is that on everything since RK3399, Rockchip abandoned that PCIe IP and licensed DesignWare instead... ;)
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