On Fri, Aug 19, 2016 at 1:32 AM, <[email protected]> wrote: > > Step 1: Figure out whether your driver is returning a physical or logical > address for the CMA, and which of the two /dev/mem requires. > > Step 2: Take a look at the address returned and make sure it at least > looks valid (is someplace the E820 map says is RAM, isn't a PCI BAR or > something like that, etc etc) > > Those are the two biggest sources of error I can think of... >
First of all, just want to make my problem clear, the "bad address" is returned when I call vmsplice(), not mmap(). 1. I have verified the address is a physical one 2. It indeed is within the RAM range What bugs me is that write() works just fine but vmsplice() complains about the address.
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