Hello,
Thanks for your help Jim.
The structure seem have the good alignement.
The structure is declaring at the adress : 0x401D0000
struct eTPU_struct *eTPU = (struct eTPU_struct *)0x401D0000;
And in the kernel code :
In file "./arch/m68k/include/asm/m523xsim.h" : #define MCF523x_ETPU
0x1D0000
In the driver file "./drivers/misc/mcfetpu_serial.c", there are "MCF_MBAR +
MCF523x_ETPU" with MCF_MBAR = MCF_IPSBAR = 0x40000000
So it's the same adress.
I made a driver to see the GPACR and the PACR* :
uint8_t *gpacr = (uint8_t *) (0x40000030);
uint8_t *pacr0 = (uint8_t *) (0x40000024);
uint8_t *pacr1 = (uint8_t *) (0x40000025);
uint8_t *pacr2 = (uint8_t *) (0x40000026);
uint8_t *pacr3 = (uint8_t *) (0x40000027);
uint8_t *pacr4 = (uint8_t *) (0x40000028);
uint8_t *pacr5 = (uint8_t *) (0x4000002A);
uint8_t *pacr6 = (uint8_t *) (0x4000002B);
uint8_t *pacr7 = (uint8_t *) (0x4000002C);
uint8_t *pacr8 = (uint8_t *) (0x4000002E);
printk(KERN_DEBUG "GPACR : %#x", *gpacr);
printk(KERN_DEBUG "PACR0 : %#x", *pacr0);
printk(KERN_DEBUG "PACR1 : %#x", *pacr1);
printk(KERN_DEBUG "PACR2 : %#x", *pacr2);
printk(KERN_DEBUG "PACR3 : %#x", *pacr3);
printk(KERN_DEBUG "PACR4 : %#x", *pacr4);
printk(KERN_DEBUG "PACR5 : %#x", *pacr5);
printk(KERN_DEBUG "PACR6 : %#x", *pacr6);
printk(KERN_DEBUG "PACR7 : %#x", *pacr7);
printk(KERN_DEBUG "PACR8 : %#x", *pacr8);
But they are all equal at "0x00".
It's very strange, isn't it?
Are they an other security to protect the register?
MENNETRIER Sébastien
FRANCE
2010/12/9 Jim Donelson <ucli...@jimdonelson.com>
> Probably has to do with structure alignment. Not sure what the packing
> options/pragmas are for that situation.
>
> On Thu, Dec 9, 2010 at 4:54 AM, Sébastien MENNETRIER
> <smennetr...@epsi.fr>wrote:
>
>> Hello,
>>
>> I work on a MCF5235 coldfire and with "uClinux-dist-20101026". I try to
>> use the eTPU.
>> I have install the driver and dowload the application to use eTPU on
>> freescale website.
>> When I start the programme, there are an error : "Access Error Exception
>> 12: Error on data read".
>>
>> So I modify the file :
>> "uClinux-dist/linux-2.6.x/arch/m68knommu/platform/523x/config.c".
>> I have modify "*gpacr" and all "*pacrx" to obtain the access to the
>> register.
>>
>> uint8_t *gpacr = (uint8_t *) (MCF_IPSBAR + MCF523x_GPACR);
>> uint8_t *pacr1 = (uint8_t *) (MCF_IPSBAR + MCF523x_PACR1);
>> uint8_t *pacr4 = (uint8_t *) (MCF_IPSBAR + MCF523x_PACR4);
>> uint8_t *pacr7 = (uint8_t *) (MCF_IPSBAR + MCF523x_PACR7);
>> uint8_t *pacr8 = (uint8_t *) (MCF_IPSBAR + MCF523x_PACR8);
>>
>> //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>> // *gpacr = 0x04;
>> // *pacr1 = 0x40; /* EIM required for Chip Select access */
>> // *pacr4 = 0x40; /* I2C */
>> // *pacr7 = 0x44; /* INTC0 & 1 handy for debug */
>> // *pacr8 = 0x40; /* FEC MAC */
>> //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>> *gpacr = 0x0C;
>> *pacr1 = 0x44; /* EIM required for Chip Select access */
>> *pacr4 = 0x44; /* I2C */
>> *pacr7 = 0x44; /* INTC0 & 1 handy for debug */
>> *pacr8 = 0x44; /* FEC MAC */
>>
>>
>> But this change did not solve the problem.
>>
>> Can you help me please?
>>
>>
>> MENNETRIER Sébastien
>> FRANCE
>>
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>
>
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