Did you use the correct mmap parameters?
Here's an example of a line using mmap() that I used to map NAND memory:
config = mmap(0, siz_config, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
fileno(fconfig), off_config);
Notice the PROT_WRITE and MAP_SHARED, these were necessary for my
purpose and perhaps using them will solve your problem as well.
Regards,
Sander
-----Original Message-----
From:
[EMAIL PROTECTED]
cidsp.com
[mailto:[EMAIL PROTECTED]
ux.davincidsp.com] On Behalf Of Carlos Ojea
Sent: Thursday, December 21, 2006 1:45 PM
To: [email protected]
Subject: Accesing dsp's memory (ddr2)
Hello:
In a user-space program called 'control' I did a mmap so I can read
dsp's memory.
However, I have this problem when I try to a write to dsp's memory :
do_wp_page: bogus page at address 4012c000
VM: killing process control
Anyone knows why I can read but not write to dsp's memory?
Thanks,
Carlos
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