From: sk.syed2@gmail.com (Syed Khader)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Need help EHCI host driver on Linux 2.6.29
Date: Tue, 21 Dec 2010 23:16:54 -0600 [thread overview]
Message-ID: <AANLkTimAKEccwkHZm3bkMQQ3edH760UW2t1ufKhia3H9@mail.gmail.com> (raw)
In-Reply-To: <483A8902-221B-41BE-8953-12921133CA50@gmail.com>
On Tue, Dec 21, 2010 at 5:18 PM, CL Lee <pelangi15@gmail.com> 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.
>
Which SoC? what arch? What is the error message you see?
> 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?
>
are you referring to qtd_dma in qdt_struct?
> 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.
>
If this register address range are actual hw addresses, then yes you
will see kernel paging error, unless you have ioremapped them.
-syed
next prev parent reply other threads:[~2010-12-22 5:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-21 23:18 Need help EHCI host driver on Linux 2.6.29 CL Lee
2010-12-22 4:38 ` Greg KH
2010-12-22 5:16 ` Syed Khader [this message]
2010-12-22 16:06 ` Bharath H S
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