Re: a problem of kernel-module version mismatch.

Hello Arnd,
I found a problem on unsolved symbol XIo_In32 and XIo_Out32: in the linux 
kernel directory of <kernel>/arch/ppc/platforms/xilinx_ocp, the original 
xio.h file lying there is provided by MontaVista. But when I use xilinx EDK 
to generate the driver for my perapheral, it generates such a file which is 
provided by Xilinx. There are some differneces between these two files. One 
is in the MVista version, the XIo_In32 or XIo_Out32 are defined as 'u32' 
type while in the Xilinx version as 'xuint32'. When I compiled the driver 
module, if I refered the header file to MVista xio.h, an error will appear 
which is 'xuint32' undeclared. If I refered to the Xilinx xio.h, the 
compilation succeeded. Do you think is that the reason why these two 
symbols cannot be resolved by Linux? Shall I use the MVista version xio.h 
and define XIo_In32 and XIo_out32 as 'u32' type and then the linux could 
recognize these two symbols? Waiting for your help. Thanks a lot.

Any information about this problem is also appreciated.

Regards
Ming

From: Arnd Bergmann <redacted>
To: "Ming Liu" <redacted>
CC: linuxppc-embedded@ozlabs.org
Subject: Re: a problem of kernel-module version mismatch.
Date: Thu, 8 Jun 2006 17:25:37 +0200

On Thursday 08 June 2006 15:52, Ming Liu wrote:

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The easiest way is usually to put the driver in your source tree
and compile everything together. That also makes it easier to
distribute the complete source tree to your users.

Sorry that I am a novice in Linux. I don't know how can I put the 

driver in

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my source tree and compile everything together. It looks like that 

there is

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no option in the menuconfig to choose a specially customed peripheral. 

So I

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think I only can include the customed peripheral as a module. Could you
please say in a detail on how to do that?

The most simple way would be to put it into linux/drivers/misc and add it
to the Makefile in there.

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insmod: unresolved symbol XIo_In32
insmod: unresolved symbol XIO_Out32

that looks like part of your module is missing. Try to find where 

thses

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functions are defined in there and why that isn't compiled.

It's very strange because I have checked the source. In the header file 

of

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xio.h, there are the following sentences,

/************************** Function Prototypes
******************************/

/* The following functions allow the software to be transportable 

across

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? processors which may use memory mapped I/O or I/O which is mapped 

into a

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? seperate address space such as X86. �The functions are better suited 

for

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? debugging and are therefore the default implementation. Macros can
instead
? be used if USE_IO_MACROS is defined.
?/
#ifndef USE_IO_MACROS

The comment tells you that you either need to implement these functions
youself or #define USE_IO_MACROS in the code before this.

quoted

/* Functions */
Xuint8 XIo_In8(XIo_Address InAddress);
Xuint16 XIo_In16(XIo_Address InAddress);
Xuint32 XIo_In32(XIo_Address InAddress);

void XIo_Out8(XIo_Address OutAddress, Xuint8 Value);
void XIo_Out16(XIo_Address OutAddress, Xuint16 Value);
void XIo_Out32(XIo_Address OutAddress, Xuint32 Value);

#else

/* The following macros allow optimized I/O operations for memory 

mapped

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I/O
? Note that the SYNCHRONIZE_IO may be moved by the compiler during
? optimization.
?/

#define XIo_In8(InputPtr) ?*(volatile Xuint8 ?)(InputPtr));
SYNCHRONIZE_IO;
#define XIo_In16(InputPtr) (*(volatile Xuint16 *)(InputPtr));
SYNCHRONIZE_IO;
#define XIo_In32(InputPtr) (*(volatile Xuint32 *)(InputPtr));
SYNCHRONIZE_IO;

#define XIo_Out8(OutputPtr, Value) �\
??{ (*(volatile Xuint8 ?)(OutputPtr) = Value); SYNCHRONIZE_IO; }
#define XIo_Out16(OutputPtr, Value) \
??{ (*(volatile Xuint16 *)(OutputPtr) = Value); SYNCHRONIZE_IO; }
#define XIo_Out32(OutputPtr, Value) \
??{ (*(volatile Xuint32 *)(OutputPtr) = Value); SYNCHRONIZE_IO; }

#endif

These macros are probably broken on powerpc.

quoted

I think these are the defination of XIo_In32 and XIo_Out32. Also, 

during

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the compilation, there is no error to complain that "XIo_In32 or 

XIo_Out32

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undeclared".

I would suggest you remove that part of the header file completely, and
replace it with:

#define XIo_In32(p) in_le32(x)
#define XIO_Out32(p,v) out_le32(p, v)

Arnd <><

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