On 25/02/18 20:47, Geert Uytterhoeven wrote:
Hi Michael,
On Sat, Feb 24, 2018 at 10:40 PM, Michael Schmitz <schmitzmic@xxxxxxxxx> wrote:
I just the saw a coherent DMA warning triggered by zorro_esp after
updating to 4.16-rc2 (commit 205e1b7f51e4af2643eb1d61a6503e415cd1e014).
What DMA mask should Zorro devices use? The full 32 bit address space
can be used by the Amiga DMA engines, right?
Are DMA engines on m68k at all coherent? We do use explicit cache push
or invalidate on the address range programmed for DMA, so no coherent DMA?
Greg reported a similar issue.
https://lkml.org/lkml/2018/2/23/1336
Haven't looked into it myself yet (it doesn't trigger on ARAnyM ;-)
Funny thing is that platform I see it on doesn't use DMA at all...
Regards
Greg
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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