Re: HELP:porting linux PXA audio driver to RTLinux(RTLinux core driver)
Hi, You cannot allocate memory in real time threads RTLinux's threads. You have to do it in the init_module function and pass the meory pointer to threads as parameter. Can you tell exactly what problem are you facing? niTin - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP:porting linux PXA audio driver to RTLinux(RTLinux core driver)
On Fri, 2005-04-08 at 21:03 -0700, nobin matthew wrote: > Please help me It's a little bit rude to blanket CC so many lists with your requests, and I'm quite sure linux-net has nothing whatsoever to do with audio. They are also all lists dedicated to the regular version of Linux, not RTLinux. You should contact FSM labs for support with RTLinux. Ian. -- Ian Campbell Be braver -- you can't cross a chasm in two small jumps. signature.asc Description: This is a digitally signed message part
Re: HELP:porting linux PXA audio driver to RTLinux(RTLinux core driver)
On Fri, 2005-04-08 at 21:03 -0700, nobin matthew wrote: Please help me It's a little bit rude to blanket CC so many lists with your requests, and I'm quite sure linux-net has nothing whatsoever to do with audio. They are also all lists dedicated to the regular version of Linux, not RTLinux. You should contact FSM labs for support with RTLinux. Ian. -- Ian Campbell Be braver -- you can't cross a chasm in two small jumps. signature.asc Description: This is a digitally signed message part
Re: HELP:porting linux PXA audio driver to RTLinux(RTLinux core driver)
Hi, You cannot allocate memory in real time threads RTLinux's threads. You have to do it in the init_module function and pass the meory pointer to threads as parameter. Can you tell exactly what problem are you facing? niTin - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP:porting linux PXA audio driver to RTLinux(RTLinux core driver)
On Fri, 2005-04-08 at 21:03 -0700, nobin matthew wrote: > Dear Friends, > > I am trying to port Linux PXA audio > driver to RTLinux. I am using pxa-ac7.c and > pxa-audio.c > and eliminated sound_core.c, and i will register two > device /dev/mixer and /dev/dsp to RTLinux kernel. > >The real need is, i wants to generate a sin > wave using audio codec. With in 600us DMA controller > should fill the codec FIFO, if that is not met > distortion will happen. I think normal linux > interrupts and Process scheduling may cause some > problems. > > In porting it seems difficult to port kernel > scheduling , dynamic memory allocation(for DMA) and > synchronization. This is the exact same question you posted to linux-audio-dev. And you'll get the same answer here: Don't waste your time with RTLinux. Use a recent 2.6 kernel with Ingo's realtime-preempt patches. Configure with PREEMPT_RT. This will provide deterministic, hard realtime performance for any RT constraint down to about 50 usecs. RTLinux can meet a ~15 usec RT constraint, the RT preempt kernel will be able to do this once the timer ISR is made preemptible again. RTLinux is an obsolescent product that had its place in the 2.4 era but is being superseded by a solution that's both technically superior and 100% free software. Real time preemption is the future of hard realtime on Linux. All the major real time Linux players have recognized this, even the ones who had competing solutions for 2.4 are porting their work to the 2.6 RT-preempt framework. Besides, RTLinux is a commercial product anyway. If this project requires use of RTLinux for political reasons, call your support rep. Lee - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
HELP:porting linux PXA audio driver to RTLinux(RTLinux core driver)
Dear Friends, I am trying to port Linux PXA audio driver to RTLinux. I am using pxa-ac7.c and pxa-audio.c and eliminated sound_core.c, and i will register two device /dev/mixer and /dev/dsp to RTLinux kernel. The real need is, i wants to generate a sin wave using audio codec. With in 600us DMA controller should fill the codec FIFO, if that is not met distortion will happen. I think normal linux interrupts and Process scheduling may cause some problems. In porting it seems difficult to port kernel scheduling , dynamic memory allocation(for DMA) and synchronization. Please help me Nobin Mathew __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
HELP:porting linux PXA audio driver to RTLinux(RTLinux core driver)
Dear Friends, I am trying to port Linux PXA audio driver to RTLinux. I am using pxa-ac7.c and pxa-audio.c and eliminated sound_core.c, and i will register two device /dev/mixer and /dev/dsp to RTLinux kernel. The real need is, i wants to generate a sin wave using audio codec. With in 600us DMA controller should fill the codec FIFO, if that is not met distortion will happen. I think normal linux interrupts and Process scheduling may cause some problems. In porting it seems difficult to port kernel scheduling , dynamic memory allocation(for DMA) and synchronization. Please help me Nobin Mathew __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP:porting linux PXA audio driver to RTLinux(RTLinux core driver)
On Fri, 2005-04-08 at 21:03 -0700, nobin matthew wrote: Dear Friends, I am trying to port Linux PXA audio driver to RTLinux. I am using pxa-ac7.c and pxa-audio.c and eliminated sound_core.c, and i will register two device /dev/mixer and /dev/dsp to RTLinux kernel. The real need is, i wants to generate a sin wave using audio codec. With in 600us DMA controller should fill the codec FIFO, if that is not met distortion will happen. I think normal linux interrupts and Process scheduling may cause some problems. In porting it seems difficult to port kernel scheduling , dynamic memory allocation(for DMA) and synchronization. This is the exact same question you posted to linux-audio-dev. And you'll get the same answer here: Don't waste your time with RTLinux. Use a recent 2.6 kernel with Ingo's realtime-preempt patches. Configure with PREEMPT_RT. This will provide deterministic, hard realtime performance for any RT constraint down to about 50 usecs. RTLinux can meet a ~15 usec RT constraint, the RT preempt kernel will be able to do this once the timer ISR is made preemptible again. RTLinux is an obsolescent product that had its place in the 2.4 era but is being superseded by a solution that's both technically superior and 100% free software. Real time preemption is the future of hard realtime on Linux. All the major real time Linux players have recognized this, even the ones who had competing solutions for 2.4 are porting their work to the 2.6 RT-preempt framework. Besides, RTLinux is a commercial product anyway. If this project requires use of RTLinux for political reasons, call your support rep. Lee - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
