Hi Greg,
#define MCF_MDHA_MDSR (*(volatile unsigned long *)(0xEC08000C))
By initializing MCF_SCM_PACRG = 0 and MCF_SCM_PACRH = 0 in DBUG, I now can
access all MDHA & SKHA registers directly.
The issue resolved. Thanks for the follow up.
Ted
>Greg Ungerer gerg at snapgear.com wrote:
>Hi Ted,
>
>Sorry for the slow response...
> printf("MDSR = 0x%08x\n",MCF_MDHA_MDSR);
> ^^^^^^^^^^^^^
>What is the definition of this?
>
>Regards
>Greg
> Ted Victorio wrote:
> Mea culpa: according to the reference manual, I have to initialize
> MCF_SCM_MPR1 to access MDHA registers.
> I added the following:
> In linux-2.6.x/include/asm-m68knommu/m532xsim.h
> #define MCF_SCM_MPR1 MCF_REG32(0xEC000000)
> In linux-2.6.x/arch/m68knommu/platform/532x/config.c
> MCF_SCM_MPR = 0x77777777;
> MCF_SCM_MPR1 = 0x66666666; //user mode (MDHA, SKHA, RNG)
> However, result is still 0xffffffff when I use the user application code
> below to read MCF_MDHA_MDSR register (the correct value should be
> 0x00008408):
> #define MCF_MDHA_MDCMR (*(volatile unsigned long *)(0xEC080008))
> /* Bit definitions and macros for MCF_MDHA_MDCMR */
> #define MCF_MDHA_MDCMR_SWR (0x00000001)
> #define MCF_MDHA_MDCMR_RI (0x00000002)
> #define MCF_MDHA_MDCMR_CI (0x00000004)
> #define MCF_MDHA_MDCMR_GO (0x00000008)
>
> int main()
> {
> MCF_MDHA_MDCMR = ( 0 | MCF_MDHA_MDCMR_CI | MCF_MDHA_MDCMR_RI |
> MCF_MDHA_MDCMR_SWR ); //1. Reset the MDHA using the
> MDCMR[SWR] bit
> printf("MDSR = 0x%08x\n",MCF_MDHA_MDSR);
> }
> Thanks again for your help.
>> Greg Ungerer gerg at snapgear.com wrote:
>> Can you show the code that you used to access registers?
>> Regards
>> Greg
>> Ted Victorio wrote:
>> The failed behavior is bad data; all registers (e.g. GPIO) will read
>> 0xffffffff.
>> The test value of MCF_SCM_MPR was 0x76666666
>> Greg Ungerer gerg at snapgear.com wrote:
>> What is the failed behavior?
>> Kernel trap?
>> Bad data?
>> Regards
>> Greg
>> Ted Victorio wrote:
>> I would like to access MCF5329 registers directly while in user space of
>> 2.6 kernel (uClinux-dist-20060803).
>> I have tried modifying MCF_SCM_MPR = 0x77777777 to MCF_SCM_MPR =
>> 0x66666666 in the "linux-2.6.x/arch/m68knommu/platform/532x/config.c"
>> file. I also made a similar change in DBUG. However, these two
>> modifications do not allow me to access registers directly.
>> The reference I consulted is Chapter 11 - System Control Module (SCM)
>> MCF5329 Reference Manual.
>> Am I doing this correctly?
>> Thanks
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