Hi Ted,
Sorry for the slow response...
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);
^^^^^^^^^^^^^
What is the definition of this?
Regards
Greg
}
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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