Re: PCIe x4 cards not detected on Z370 mainboards

[Wolfgang Denk <wd@denx.de>]

Dear Bjorn,

In message <20180326190938.GA224629@bhelgaas-glaptop.roam.corp.google.com> you wrote:
>
> On the MSI Z370 Tomahawk and the Gigabyte Z270X Ultra Gaming systems,
> it looks like you're using what the BIOS designates as "Slot #1",
> which is below an Intel Root Port (00:01.0 in both cases).  When the

Correct.  I always used the first available (x16) slot; on these two
boards I have Intel Core i5 processors, so I can use the on-cip
graphics and have no need for a graphics adapter, so this is really
the first PCIe x16 slot.

> On the Gigabyte AB350 Gaming system, you're using "Slot #1" (this
> comes from the Slot Capabilities register and may not match any
> silk-screened labels on the board).  This is below an AMD PCIe switch,
> where 04:04.0 is the Downstream Port leading to that slot.  When the
> SAS3444E is in the slot, we do see the 04:04.0 Downstream Port, so we
> *should* still be able to see the SAS device.

This board has a AMD Ryzen 5 1600 Six-Core Processor, so I have to
use a graphics adapter, which occupies the 1st PCIe x16 slot.  So I
used the next frree one.

> On that system, you could try something like this to reset the
> SAS3444E device and try to rescan the bus:

And now comes the next surprise:

On this board the LSI controller suddenly started working!  I get
the BIOS start message from it, and Linux detects it...

The only difference is that i have installed the kcbench package to
get at the acpidump tool:

2018-03-26T14:15:15Z INFO Installed: kcbench-data-4.4-0.1-21.fc27.noarch
2018-03-26T14:15:16Z INFO Installed: kcbench-0.3-17.fc27.noarch
2018-03-26T14:15:16Z INFO Installed: kcbench-data-0.1-21.fc27.noarch

No other changes to the hardware or software at all.  And I always
powered off the system when changing the boards, so even this makes
no difference.

Oh, and we are running at DST now, so maybe it is POM dependent :-(


I have uploaded updated lspci/dmesg/acpidump output for this new,
working case, see files

Gigabyte-AB350-Gaming-CF-lspci-lsi-sas3444e.1
Gigabyte-AB350-Gaming-CF-dmesg-lsi-sas3444e.1
Gigabyte-AB350-Gaming-CF-acpidump-lsi-sas3444e.1

On the other Gigabyte board I see tiny changes in the logs, but the
card is still not working.  New log files (sith suffix .1) also
uploaded.

Gigbyte support recommeded to "try  Other PCI devices: Legacy in
bios setup".  Good point.  Tried that on the remainin non-working
Gigabyte board.  Some difference in the acpidump, no differences in
lspci output or behaviour.  Nonworking. New log files with suffix .2

Strange...

Best regards,

Wolfgang Denk

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