Måns Rullgård wrote:
Kieran Bingham <[email protected]>
writes:
Is it possible to read / access the cycle count register in userspace?
The counters are accessible to userspace only if enabled in the
kernel. Here's a patch to do that:
http://git.mansr.com/?p=linux-omap;a=commitdiff;h=5170038
Aha - the missing link ...
That patch states it depends on CPU_V7 will this work on ARM9? - I'm on
a DM365 processor
I added
<http://git.mansr.com/?p=linux-omap;a=blob;f=arch/arm/mm/proc-v7.S;h=fec926a18ad2975571755d74aa2b5a57e486843b;hb=5170038#l275>
mov r0, #1
<http://git.mansr.com/?p=linux-omap;a=blob;f=arch/arm/mm/proc-v7.S;h=fec926a18ad2975571755d74aa2b5a57e486843b;hb=5170038#l276>
mcr p15, 0, r0, c9, c14, 0
to the __arm926_setup: within arch/arm/mm/proc-arm926.S but the kernel
fails to boot past init. I presume it causes an illegal instruction and
spins...
--
Regards
Kieran
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