linux-kernel - [BUG BISECT] Ethernet fail on VF50 (OF: Don't set default coherent DMA mask)

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Message-ID: <CAJKOXPeaguNxRr7pCArJ5Db4tS6Kr5BDheCxskY+vd0dUN+0GQ@mail.gmail.com>
Date:   Fri, 27 Jul 2018 15:11:55 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Robin Murphy <robin.murphy@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Christoph Hellwig <hch@....de>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stefan Agner <stefan@...er.ch>,
        Fugang Duan <fugang.duan@....com>
Subject: [BUG BISECT] Ethernet fail on VF50 (OF: Don't set default coherent
 DMA mask)

Hi,

On today's next, the bisect pointed commit
ff33d1030a6ca87cea9a41e1a2ea7750a781ab3d as fault for my boot failures
with NFSv4 root on Toradex Colibri VF50 (Iris carrier board).

Author: Robin Murphy <robin.murphy@....com>
Date:   Mon Jul 23 23:16:12 2018 +0100
    OF: Don't set default coherent DMA mask

Board: Toradex Colibri VF50 (NXP VF500, Cortex A5, serial configured
with DMA) on Iris Carrier.

It looks like problem with Freescale Ethernet driver:
[   15.458477] fsl-edma 40018000.dma-controller: coherent DMA mask is unset
[   15.465284] fsl-lpuart 40027000.serial: Cannot prepare cyclic DMA
[   15.472086] Root-NFS: no NFS server address
[   15.476359] VFS: Unable to mount root fs via NFS, trying floppy.
[   15.484228] VFS: Cannot open root device "nfs" or
unknown-block(2,0): error -6
[   15.491664] Please append a correct "root=" boot option; here are
the available partitions:
[   15.500188] 0100           16384 ram0
[   15.500200]  (driver?)
[   15.506406] Kernel panic - not syncing: VFS: Unable to mount root
fs on unknown-block(2,0)
[   15.514747] ---[ end Kernel panic - not syncing: VFS: Unable to
mount root fs on unknown-block(2,0) ]---

Attached - defconfig and full boot log.

Any hints?
Let me know if you need any more information.

Best regards,
Krzysztof

View attachment "vf-boot-log.txt" of type "text/plain" (29579 bytes)

Download attachment "defconfig" of type "application/octet-stream" (6644 bytes)