2009-03-30 16:31:11 Using bfin_read_MMR
Christopher Harrsen (UNITED STATES)
Message: 71793
Hello,
I am trying to use bfin_read_MMR in a user application. Specifically bfin_read_PORTG_FER(). When I compile my code I get the following error.
/tmp/ccqZQhm5.o: In function `_main':
BF548_blink.c:(.text+0xd8): undefined reference to `_bfin_read_PORTG_FER'
collect2: ld returned 1 exit status
I included blackfin.h from asm-blackfin/mach-bf548/. Is there something else I should do?
Thanks
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2009-03-30 16:40:09 Re: Using bfin_read_MMR
Mike Frysinger (UNITED STATES)
Message: 71795
uhh, MMRs are restricted to supervisor, so you cant access them from user space ...
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2009-03-30 17:22:04 Re: Using bfin_read_MMR
Christopher Harrsen (UNITED STATES)
Message: 71797
Got it. I mis-interpreted the documentation.
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2009-03-30 17:56:53 Re: Using bfin_read_MMR
Mike Frysinger (UNITED STATES)
Message: 71799
if you just want stuff for debugging purposes, use debugfs
docs.blackfin.uclinux.org/doku.php?id=linux-kernel:debug