Linux kernel for MPC834X platform

Kumar Gala galak at
Tue Apr 11 23:03:20 EST 2006

On Apr 11, 2006, at 5:30 AM, Stefan Meyer wrote:

> Hi All
> Pardon the intrusion if this is not the correct way to get the  
> relevant information, but I am relatively new to kernel hacking.
> Anyway here goes my question:
> I am getting a Freescale MPC8343 based board up and running and  
> have been using the BSP (with patched 2.6.11 kernel) release by  
> Freescale with great success.
> However when I tried to use the USB ISO transactions it seems to be  
> non functional. I have connected a known good working codec (tested  
> on my PC's usb) and tried to access it via the low level sound  
> driver (/dev/dsp) but it only creates garbled noise.
> In the meanwhile, I have noticed that the official kernel release  
> 2.6.17 also start supporting the MPC834X platform and would rather  
> like to persue that avenue to get my problems addressed (hopefully).
> I have downloaded the latest 2.6.17 kernel and got it going  with  
> the configuration for MPC834x_sys, with relation to booting and  
> ethernet comms.
> However there are clearly no provision in the USB driver for  
> setting up the usb clocks and ports (which is of course MPC834x  
> specific).
> I have tried to hack it by inserting approriate code form the  
> 2.6.11 freescale kernel but with very little success.
> On inspection of the 2.6.11 kernel from Freescale I have also  
> noticed that the USB core drivers were heavily modified around DMA  
> buffer management, although the 2.6.17 had no such hacks in place.
> My question simply relates to the status of the MPC834x  
> implementation on the 2.6.17 kernel in so far that it is  
> operational and being tested on hardware platforms. Could you  
> please direct me to the persons(s) who have experience with this  
> platform ?

The USB support for MPC834x only exists if you build it for  
ARCH=powerpc.  There is a patch on the list archives for adding  
support to ARCH=ppc.  I don't know if there is any issue with ISO  
transactions in those version, but they been shown to work with USB  
ethernet and USB HD devices.

- kumar

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