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Re: kern/50038: udl (DisplayLink GX-DVI_U2B) alignment fault on earmv6hf NETWALKER
On 11/14/16 20:30, MOCHIDA Shuji wrote:
The following reply was made to PR kern/50038; it has been noted by GNATS.
From: MOCHIDA Shuji <mochid%netside.co.jp@localhost>
Cc: skrll%netbsd.org@localhost, gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost,
gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, mochid%netside.co.jp@localhost
Subject: Re: kern/50038: udl (DisplayLink GX-DVI_U2B) alignment fault on
Date: Tue, 15 Nov 2016 03:31:56 +0900 (JST)
Easy workaround below. May something related to alignment.
In these functions, (curcpu()->ci_ctrl & CPU_CONTROL_AFLT_ENABLE) is zero.
This should not be zero?
We should be running with SCTLR.A =0 and SCTLR.U = 1, i.e.
CPU_CONTROL_AFLT_ENABLE unset and CPU_CONTROL_UNAL_ENABLE set, but
I think the usb transfer buffer is being marked as device/strongly
ordered memory and
we get an unaligned access fault because of this.
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