Other Parts Discussed in Thread: AM3874
Hi,
I have one question for DUCATI(=M3) access.
Sympton：
Now my customer connects ASIC to GPMC module of AM3874.
Please see the assembler list in the below.
1) If data 0x02(R4) is written to physical address 0x481800574, MODULEMODE of DUCATI_CLKCTRL Registeris enabled.
2) When DUCATI(=M3) is enabled, wrong access to the outside of M3 happens, and its address is output from GPMC external bus to customer's ASIC.
3) If ASIC can’t respond to wrong address on GPMCexternal bus, GPMC module continues to wait the readysignal from ASIC. According to the analysis, the read access to 0x84413A0 and 0x8641320 happens. And this wrong accrss causes this failure.
4) If Cortex-A8 core access to GPMC when GPMC contunes to wait the ready signal, GPMC does not respond to A8 core, and data abort happens. This is one prediction.
0x80008adc E5903B10 LDR R3,[R0,#0xb10]
0x80008ae0 E3A04002 MOV R4,#0x2
0x80008ae4 E7C4321F BFC R3,#4,#4
0x80008ae8 E5803B10 STR R3,[R0,#0xb10]
0x80008aec E5903B10 LDR R3,[R0,#0xb10]
0x80008af0 E7C4311F BFC R3,#2,#4
0x80008af4 E5803B10 STR R3,[R0,#0xb10]
0x80008af8 E5804518 STR R4,[R0,#0x518]
0x80008afc E5804574 STR R4,[R0,#0x574] <-------
0x80008b00 E5903574 LDR R3,[R0,#0x574]
0x80008b04 E3130803 TST R3,#0x30000
0x80008b08 1AFFFFFC BNE 0x80008b00
R0 virtual address : 0x90180000、R0 physical address : 0x48180000
Questions:
1) I think that red character line enables the DUCATI(=M3) . Is my understanding right?
2)If the red character line is execulted, some GPMC access happens to the external bus?
I can't understand why some GPMC access happens by executing the red character line.
Please advise me.
Best regards,
Michi
