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From: bugzilla-daemon@bugzilla.kernel.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 198883] amdgpu: carrizo: Screen stalls after starting X
Date: Wed, 21 Mar 2018 14:23:53 +0000	[thread overview]
Message-ID: <bug-198883-2300-j4oAcy8Aob@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-198883-2300@https.bugzilla.kernel.org/>

https://bugzilla.kernel.org/show_bug.cgi?id=198883

--- Comment #68 from Andrey Grodzovsky (andrey.grodzovsky@amd.com) ---
(In reply to Ricardo Ribalda from comment #67)
> I have coreboot. So I do not have the typical menu.
> 
> I have an FPGA writing to the main memory, and that could not happen if
> iommu is enabled without extra configuration.
> 
>  If you can tell me which register to look for we can be 100% sure.

I took a bettong board here in office, booted it  while pressing ESC, goes into
BIOS, then choosing Chipest->GFX Configuration->IOMMU En/Dis

But i guess you mean you have coreboot INSTEAD of standard BIOS like i have, 

So at least you sure you have the following disabled  as in this link -
https://wiki.gentoo.org/wiki/IOMMU_SWIOTLB

IOMMU Hardware Support disabled in make menuconfig and also you boot the kernel
with iommu=off ?

If so I assume you indeed have IOMMU disabled and then I will try later to
again reproduce your issue with Bettong board I just found because before I was
reproducing with a different CZ board.

Andrey

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  parent reply	other threads:[~2018-03-21 14:23 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-22 10:46 [Bug 198883] New: amdgpu: carrizo: Screen stalls after starting X bugzilla-daemon
2018-02-22 10:47 ` [Bug 198883] " bugzilla-daemon
2018-02-22 10:47 ` bugzilla-daemon
2018-02-22 10:47 ` bugzilla-daemon
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