* cx88 WRITERM instruction
@ 2013-01-07 11:38 Daniel Glöckner
0 siblings, 0 replies; only message in thread
From: Daniel Glöckner @ 2013-01-07 11:38 UTC (permalink / raw)
To: linux-media
Hi,
I'm trying to add precise timestamps to the cx88 driver but I
somehow fail to use the WRITERM instruction correctly. Has anyone
ever successfully used that RISC instruction? Is there a bit that
needs to be flipped to actually make it perform writes to the PCI
bus?
I know it is executed because I get a RISC_RD_BERR_INT if I
replace the third word with junk but no matter what I do the target
memory stays untouched (yes, it is coherent memory and I use the DMA
address).
Thanks,
Daniel
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2013-01-07 11:38 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-01-07 11:38 cx88 WRITERM instruction Daniel Glöckner
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).