Magnus Lundin wrote:
> tangray wrote:
>> Trying to access Debug Reister Interface with mdw I get
>>
>>> omap3.cpu mdw 0x54011d00
>>>
>>
>> 0x54011d00 411fc082 ...A
>>
>> Looking at Cortex-A8 TRM, it seems OK.
>>
>>> omap3.cpu mdw 0x54011088
>>>
>> AHBAP Cached values: dp_select 0x0, ap_csw 0xc3800042, ap_tar 0x54011088
>>
>> SWJ-DP STICKY ERROR
>>
>> Read MEM_AP_CSW 0x43800042, MEM_AP_TAR 0x54011088
>>
>> AHBAP Cached values: dp_select 0x0, ap_csw 0xc3800042, ap_tar 0x54011088
>>
>> SWJ-DP STICKY ERROR
>>
>> Read MEM_AP_CSW 0x43800042, MEM_AP_TAR 0x54011088
>>
>> Block read error address 0x54011088, count 0x1
>>
>> Runtime error, file "command.c", line 456:
>>
>> error reading target @ 0x54011088
>>
> Look at Cortex-A8 TRM table 12-3, the registers that works are the ones that
> are
> in the Debug power domain, the others are in the Core power domain.
>
> STICKY errors are signals of a bus or access error, so registers in the
> Debug power domain are connected/powered/accesible from the MEM-AP and the
> ones
> in the Core power domain are not.
>
> On page 12-53 we find the following:
>
>
>
> -------------------------
>
> Note
>
> On system reset, PRSR[1] resets to 1. Table 12-6 on page 12-15 specified
> that if PRSR[1] is set to 1, then accessing any register in the core power
> domain results in an error response. For these reasons, the debugger cannot
> access any
> register in the core power domain unless the debugger clears PRSR[1] to 0.
>
> -------------------------
>
> PRSR is at offset 0x314, the sticky bits are cleared by just reading
> this register, try it twice :)
Yes, you are right, the manual tells so:
"Sticky power-down status bit. This bit cleared to 0 on read:"
but seems we still miss something:
-- cut --
> omap3.cpu mdw 0x54011d00
0x54011d00 411fc082 ...A
> omap3.cpu mdw 0x54011310
0x54011310 00000000 ....
> omap3.cpu mdw 0x54011314
0x54011314 00000003 ....
> omap3.cpu mdw 0x54011314
0x54011314 00000003 ....
> omap3.cpu mdw 0x54011314
0x54011314 00000003 ....
> omap3.cpu mdw 0x54011088
AHBAP Cached values: dp_select 0x0, ap_csw 0xa2000012, ap_tar 0xffffffff
SWJ-DP STICKY ERROR
Read MEM_AP_CSW 0x2800052, MEM_AP_TAR 0x54011088
AHBAP Cached values: dp_select 0x0, ap_csw 0xa2000012, ap_tar 0xffffffff
SWJ-DP STICKY ERROR
Read MEM_AP_CSW 0x2800052, MEM_AP_TAR 0x54011088
Block read error address 0x54011088, count 0x1
Runtime error, file "command.c", line 456:
error reading target @ 0x54011088
>
-- cut --
Hmmh...
Best regards
Dirk
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