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SubjectRe: [BUG BISECT] Ethernet fail on VF50 (OF: Don't set default coherent DMA mask)
On Fri, Jul 27, 2018 at 03:18:14PM +0200, Krzysztof Kozlowski wrote:
> On 27 July 2018 at 15:11, Krzysztof Kozlowski <krzk@kernel.org> wrote:
> > 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@arm.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.
>
> My Exynos boards also fail to boot on missing network:
> https://krzk.eu/#/builders/21/builds/799/steps/10/logs/serial0
>
> As expected there are plenty of "DMA mask not set" warnings... and
> later dwc3 driver fails with:
> dwc3: probe of 12400000.dwc3 failed with error -12
> which is probably the answer why LAN attached to USB is not present.

Looks like all the drivers failed to set a dma mask and were lucky.

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