simple mmap problem on at91sam9263

[Harald Krammer]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Phillip Liang schrieb:
> Hi,
> I am trying GPIO on at91sam9263 with 2.6.21.1 Kernel using uclibc 0.9.29.
> The simple mmap always return -1. errno = 22, EINVAL.
> How do I debug the problem?
> thanks.
> 
> #define MAP_SIZE 4096UL
> #define MAP_MASK (MAP_SIZE - 1)
> #define AT91_SYS        0xFFFFE000
> 
> 
>   map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, AT91_SYS & ~MAP_MASK);
> 
> the same error from :
>  map_base = mmap(0, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0xffffe000);
> 

Hello,

fd is created like this ?
 if( (fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1)
 ....

There was a bug in mmap  in 0.9.29 (patch
uClibc-0.9.29-001-fix-mmap.patch should fix it )
http://www.uclibc.org/cgi-bin/viewcvs.cgi/trunk/buildroot/toolchain/uClibc/uClibc-0.9.29-001-fix-mmap.patch

You can try 0.9.28.3 or latest version...

Nice greetings,
Harald


- --

Harald Krammer
Brucknerstrasse 33
A - 4020  Linz
AUSTRIA

Mobil +43.(0) 664. 130 59 58
Mail: Harald.Krammer (at) hkr.at
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFHDStu9QlAsubHO9sRAoIxAJoCfvC6EyYTqIoMyRxjwb51smO3sQCgjLqM
V7DI3rNGGZBKu4o7JySv25E=
=2ra9
-----END PGP SIGNATURE-----