Machine check in USB driver interrupt handler on 8xx board

Machine check in USB driver interrupt handler on 8xx board

[carolyn.j.smith]

Hello,

I am porting a USB (Philips ISP116x) driver to an 8xx (852T in particular)
board. It is built into the kernel at the moment (i.e. it isn't a loadable
module) and comes up fine and gets and handles interrupts (at least 2400 of
them) while the rest of the kernel is initializing.

Just before the kernel is completely up, after the message "Freeing unused
kernel memmory ...", I get a machine check in the driver's interrupt
handler, in particular on a write to the command port register. 

The ISP116x has only 2 16-bit registers which are memory mapped to 2 16-bit
words in the phyiscal address space 0xfa000000 and 0xfa000002 and then
ioremap'ed to kernel address space when the driver starts up. That seems to
be working fine up until the machine check occurs.

I am baffled and don't know where to look next. Any ideas / suggestions will
be gratefully received.

Carolyn Smith
Tektronix, Inc.

Re: Machine check in USB driver interrupt handler on 8xx board

[Wolfgang Denk]

Dear Carolyn,

in message <212D7E61C1F7D511B9270002A507DE7D07AB3974@us-bv-m10.bv.tek.com> you wrote:
> 
> I am porting a USB (Philips ISP116x) driver to an 8xx (852T in particular)
> board. It is built into the kernel at the moment (i.e. it isn't a loadable
> module) and comes up fine and gets and handles interrupts (at least 2400 of
> them) while the rest of the kernel is initializing.
...
> I am baffled and don't know where to look next. Any ideas / suggestions will
> be gratefully received.

You can find a working driver for the ISP1362 in our
linuxppc_2_4_devel kernel tree. This might get you started...

Best regards,

Wolfgang Denk

-- 
See us @ Embedded/Electronica Munich, Nov 09 - 12, Hall A.6 Booth 513
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
The light at the end of the tunnel is usually a "No Exit" sign.

Re: Machine check in USB driver interrupt handler on 8xx board

[Armin Schindler]

Hello Carolyn,

On Wed, 27 Oct 2004 carolyn.j.smith@exgate.tek.com wrote:
> Hello,
> 
> I am porting a USB (Philips ISP116x) driver to an 8xx (852T in particular)
> board. It is built into the kernel at the moment (i.e. it isn't a loadable
> module) and comes up fine and gets and handles interrupts (at least 2400 of
> them) while the rest of the kernel is initializing.
...
> I am baffled and don't know where to look next. Any ideas / suggestions will
> be gratefully received.

I had a similar problem with this driver when porting it. But now it 
works and we use it with the kernel in our ELinOS distribution.
Contact me if you are interested and I can send the driver to you.

Regards,
Armin Schindler 

SYSGO AG
Am Pfaffenstein 14
D-55270 Klein-Winternheim / Germany
Phone: +49 6136 9948-0
Fax  : +49 6136 9948-10
armin.schindler@sysgo.com
www.sysgo.com
www.elinos.com