[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
PR/54486 CVS commit: src/sys/arch/arm/conf
The following reply was made to PR kern/54486; it has been noted by GNATS.
From: "Rin Okuyama" <rin%netbsd.org@localhost>
Subject: PR/54486 CVS commit: src/sys/arch/arm/conf
Date: Mon, 26 Aug 2019 17:18:42 +0000
Module Name: src
Committed By: rin
Date: Mon Aug 26 17:18:42 UTC 2019
Workaround for alignment faults on ARMv6+, at least occur with
axe(4) and athn(4) drivers.
For ARMv6+, unaligned access is enabled by default. However, it
cannot be used for non-cacheable memory, which is used as DMA
buffers. This results in alignment faults above. A real fix is
to use cacheable memory as DMA buffers. However, it breaks some
drivers, awge(4) and vchiq(4) at least.
Until we figure out problems and fix them, we choose a fail-safe
workaround here; forbid unaligned memory access for whole kernel.
Affects on performance is negligibly small as far as we can see.
To generate a diff of this commit:
cvs rdiff -u -r1.49 -r1.50 src/sys/arch/arm/conf/Makefile.arm
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Main Index |
Thread Index |