I've try to had the O_SYNC but nothing change the io stay in high
level like if the io es in input mode nevertheless, the dirction
register is correctly configured.
I've try the io in a module kernel, and the same io doesn't work !
--- In "Matt Godbolt" <> wrote:
>
>
> > This is my test program :
> >
> > int main(int argc, char ** argv)
> > {
> > volatile unsigned int * PBDR, *PBDDR, *PEDDR, *PEDR,
> > *PFDDR,*PFDR,*PCDDR,*PCDR;
> >
> > unsigned char * start;
> >
> > int fd = open("/dev/mem", O_RDWR);
> > start = mmap(0, getpagesize(), PROT_READ|PROT_WRITE,
> > MAP_SHARED, fd,0x80840000);
>
> Part of your issue might be that you're opening /dev/mem without the
> O_SYNC flag. This means the kernel is at liberty to give you a
> pointer to cached memory, which might (at a push!) cause the kind of
> issues you're experiencing. Worth giving it a go with O_RDWR|O_STAT
> anyway!
>
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