Hi all!
I'm porting a program written in C that uses mmap (fpmmap) that maps GPIOs
and other utilities on a beaglebone. Everything is going well, until the
test, where I see the all base address of beaglebone in FPC should be
divided by 4096 dec ($1000 hex) to get it working. Example:
In C:
CM_BaseAddr = mmap(NULL, 0x4000, PROT_READ | PROT_WRITE,
MAP_SHARED, devmemfd, *0x44e00000*);
to get the "same" code working in FPC I have to change some constants.
CM_BaseAddr := Fpmmap(NULL, $4000, PROT_READ + PROT_WRITE,
MAP_SHARED, devmemfd, *$44e00*);
I did a strace in the FPC executable, and the in line above, the base
address is "multiplied" by 4096 dec ($1000 hex) becoming back equal to the
C constant.
The question is: this is intentional? Has some technical point that's not
mentioned on the fpmmap documentation? Or it's simply a bug?
--
The best regards,
Fabio Luis Girardi
PascalSCADA Project
http://sourceforge.net/projects/pascalscada
http://www.pascalscada.com
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