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Re: loongson2f: 2.02-beta3 hangs, caused by memory coherence fixes

From: Mark H Weaver
Subject: Re: loongson2f: 2.02-beta3 hangs, caused by memory coherence fixes
Date: Thu, 18 Aug 2016 15:53:51 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Andrei Borzenkov <address@hidden> writes:

> 12.08.2016 21:16, Mark H Weaver пишет:
>> On my Lemote YeeLoong 8101B (Loongson 2F), loading GRUB 2.02-beta3 from
>> PMON hangs early before displaying any messages.  Usually the screen is
>> black, but occasionally there are some non-black pixels sprayed on the
>> screen.
>> Git bisect and followup investigation shows that the following two
>> commits, which insert calls to 'grub_arch_sync_dma_caches', cause the
>> problem:
>> * ca028db..: Vladimir Serbinenko 2016-02-23 usbtrans: Fix memory coherence 
>> and use-after-free.
>> * 0f076d7..: Vladimir Serbinenko 2016-02-23 ehci: Fix memory coherence
>> Either one of these commits is sufficient to cause the problem.
>> Reverting both of them fixes it.


> Without knowing anything about MIPS - can this somehow be related?
> https://lists.gnu.org/archive/html/grub-devel/2015-06/msg00060.html

I don't know.  I tried applying the patch suggested in that email to
GRUB 2.02-beta3, but the result still hangs early with a black screen.
As far as I can tell, it made no observable difference.


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