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Re: [rtl] SharedMemory in Beta11

On Thu, 5 Aug 1999, Zhigao Yao wrote:

> 4092K shared memory pool for use(append="mem=126980k". Shared Memory pool
> base address is 0x7C01000). The following piece of code works well in
> RTLinux1.1, but it cause segmentation fault in Beta11+Kernel2.2.10.
> 
> 	data1 = (int *)0x7C01000;

Because you are using it incorrectly. See 
/usr/src/linux/Documentation/IO-mapping.txt
You will probably need 

#if LINUX_VERSION_CODE < 0x020100
        #define ioremap vremap
        #define iounmap vfree
#endif


data1 = (int *)ioremap(0x7C01000,4092*1024);
*data1 =3;


Or just take http://crds.chemie.unibas.ch/PCI-MIO-E/mbuff-0.5.tar.gz and use
it.

--
Tomek

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