Dear Experts,

I am developing a EHCI host driver for Linux kernel 2.6.29 on a proprietary 
SoC. But for weeks now, I am troubleshooting a time out error from khubd.

I believe it's related to the client device not being able to update the qtd 
struct which has been set at some Dma addresses, say 0x87xxxxxx. Is this 
possible?

The main issue is the register address for chip lies in 0x5a800000 range, so is 
the on-chip memory. If I set the qtd structs to on chip memory(internal sram), 
kernel paging error will occur. 

So I am at a loss of what I can. Please kindly advise.

Best regards,
CL
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