Local Access Windows (LAWs), memory overlap

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Local Access Windows (LAWs), memory overlap

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marklv
Contributor I

About LAW understanding : about the B4860 , just e.g B4860QDS;

Local Access Windows (LAWs):

in the B4860_QDS_Init.tcl file have set the Local Access Window Registers (as below have defined the phy address 0x000000, size 2Gbytes target to DDR)

and in the  dpaa_demo.c of CW_SC_3900FP_v10.8.3\SC\StarCore_Support\SmartDSP\demos

add the LAW setting the phy address 0x20000000 target  to  QMAN

my query or confusing is  the LAW 10 setting (0x0000000~0x7fffffff target to DDR)   memory overlapped with  QMAN software port  LAW setting the phy address 0x20000000 target  to  QMAN.

memory overlapped  between LAW , is it ok? and can explain detail why it can work ? there is not descript memory overlapped situation of LAW  in the reference manual of B4860.


 ## LAW10 to DDRC2
 # LAWBARH
 mem [CCSR_ADDR 0x000CA0] = 0x00000000
 # LAWBARL
 mem [CCSR_ADDR 0x000CA4] = 0x00000000
 # LAWAR
 mem [CCSR_ADDR 0x000CA8] = 0x8110001E

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jons_william
Contributor I

 

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ufedor
NXP Employee
NXP Employee

Please refer to the B4860 QorIQ Qonverge Multicore Baseband Processor Reference Manual, 2.3.1 Precedence of Local Access Windows.

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marklv
Contributor I

thx

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