Need help EHCI host driver on Linux 2.6.29

Greg KH greg at
Tue Dec 21 23:38:35 EST 2010

On Wed, Dec 22, 2010 at 07:18:35AM +0800, CL Lee wrote:
> 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.

Ick, you do realize how old 2.6.29 is, right?  It's many years old, and
way out of date and unsupported.  If you are stuck with it, you are on
your own, sorry.

> 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.

Care to try your driver out on .36 or .37-rc6? and post your code?
Without that, there's not much we can do, sorry.

good luck,

greg k-h

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