diff options
| author | rin <rin@NetBSD.org> | 2019-08-26 17:18:42 +0000 |
|---|---|---|
| committer | rin <rin@NetBSD.org> | 2019-08-26 17:18:42 +0000 |
| commit | 59b03441e71de7ea46166177d6ba40ba06e439ea (patch) | |
| tree | b97b2f33986c8f864d6d9cbb89f0aa040d7fc32d /sys/dev | |
| parent | a6fbed0cd360a5346f582aaf8e0c325bd471f100 (diff) | |
PR kern/54486
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.
XXX
pullup netbsd-9
Diffstat (limited to 'sys/dev')
0 files changed, 0 insertions, 0 deletions
