Re: a problem of kernel-module version mismatch.

Dear Arnd,
I have tried to replace the original definations for XIn_In32 and XIn_Out32 
by what you suggested: 
           #define XIo_In32(p) in_le32(x)         (Should that be 
in_le32(p) instead of x?)
           #define XIO_Out32(p,v) out_le32(p, v)

The following warnings are generated: 
passing arg 1 of 'in_le32' (and 'out_le32') makes pointer from integer 
without a cast

Also, when I try to insmod FIFO.o, the following errors appeared:
insmod: unresolved symbol out_le32
insmod: unresolved symbol in_le32

Are in_le32 and out_le32 two functions defined by the kernel to input and 
output 32-bit data? When we define XIo_In32 and XIo_Out32 as them, which is 
we use out_le32 and in_le32 to input and output data, they are still not 
resolvable. Any other suggestions? Thanks a lot.

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:

quoted

quoted

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

quoted

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

there is

quoted

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

So I

quoted

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.

quoted

quoted

quoted

insmod: unresolved symbol XIo_In32
insmod: unresolved symbol XIO_Out32

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

thses

quoted

quoted

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

quoted

xio.h, there are the following sentences,

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

/* The following functions allow the software to be transportable 

across

quoted

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

into a

quoted

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

for

quoted

? 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

quoted

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

quoted

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

XIo_Out32

quoted

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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