QMSS initialization on Linux c6x

Hi,

Thanks for your post.

In order to use the QMSS’ internal Linking RAM, we need to specify a value of 0x00080000 for KeyStone I, 0x00100000 for KeyStone II’s QM1. Please check Table 4-4 from the user guide below:

http://www.ti.com.cn/cn/lit/ug/sprugr9h/sprugr9h.pdf

In general, Queue managers need to be programmed with identical descriptor memory regions and likewise, the linking RAM

registers in both QMs need to be programmed identically. Please note that, Linking RAM 0 need to be configured to use internal QMSS memory where as for Linking RAM 1, it would use L2 or DDR. For efficiency reasons, it would be best to use the internal QMSS Link RAM memory.

The Linking RAM Region 0 Base Address Register is used to set the base address for the first portion of the linking RAM. This address is used by the queue manager to calculate the 32-bit linking address for a given descriptor index. For more info. please see Table 4-1 for queue configuration region registers from the above user guide.

I would recommend you to review the attached QMSS PPT slides for more understanding on QMSS descriptors and descriptor memory regions on slides 18 and 19.

/cfs-file/__key/communityserver-discussions-components-files/354/4745.KeyStone-Multicore-Navigator.pptx

Thanks & regards,

Sivaraj K

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Sivaraj,

sorry for replying late (i was out of office) and thanks for your useful information and links

i boot linux c6x on 6678 EVM and read QMSS register using jtag :

linux c6x use link RAM 0 only (don't use link RAM 1 ) and single memory region configured at 0x0C000000-0xC002020 (please confirm if it is correct)

thanks 

Ebi