Linux kernel for MPC834X platform
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 ? Regards Stefan -- next part -- An HTML attachment was scrubbed... URL: http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20060411/b297f718/attachment.htm
Linux kernel for MPC834X platform
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
Linux kernel for MPC834X platform
Hi Kumar Thanks for the advice. I will rebuild for powerpc and report back. B.t.w. what is the story behind the ppc and powerpc branches anyway ? Regards Stefan - Original Message - From: Kumar Gala [EMAIL PROTECTED] To: Stefan Meyer reyems at telkomsa.net Cc: linuxppc-embedded at ozlabs.org Sent: Tuesday, April 11, 2006 3:03 PM Subject: Re: Linux kernel for MPC834X platform 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
Linux kernel for MPC834X platform
On Tue, 11 Apr 2006, Stefan Meyer wrote: Hi Kumar Thanks for the advice. I will rebuild for powerpc and report back. B.t.w. what is the story behind the ppc and powerpc branches anyway ? The powerpc tree is a merge of the ppc32/64 trees into one arch. It requires a flat device tree to boot. You will need a new u-boot for this that produces a flat device tree. - kumar
Linux kernel for MPC834X platform
Hi Kumar Pardon my ignorance, but I am not with you on the flat device tree and the new u-boot ?? Regards Stefan - Original Message - From: Kumar Gala [EMAIL PROTECTED] To: Stefan Meyer reyems at telkomsa.net Cc: linuxppc-embedded at ozlabs.org Sent: Tuesday, April 11, 2006 5:14 PM Subject: Re: Linux kernel for MPC834X platform On Tue, 11 Apr 2006, Stefan Meyer wrote: Hi Kumar Thanks for the advice. I will rebuild for powerpc and report back. B.t.w. what is the story behind the ppc and powerpc branches anyway ? The powerpc tree is a merge of the ppc32/64 trees into one arch. It requires a flat device tree to boot. You will need a new u-boot for this that produces a flat device tree. - kumar
Linux kernel for MPC834X platform
On Tue, 11 Apr 2006, Stefan Meyer wrote: Hi Kumar Pardon my ignorance, but I am not with you on the flat device tree and the new u-boot ?? Regards Stefan Look at Documentation/powerpc/booting-without-of.txt in the kernel tree. I have a u-boot tree @ git.kernel.org/pub/scm/boot/u-boot/u-boot.git which has support for booting the MPC834x ADS/MDS/SYS board from Freescale with a flat device tree for use with the arch/powerpc port. - kumar
