<html><body><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:12pt"><div><div>Hi, List,</div><div><br></div><div>I heard through the grape vine that you are considering using NuttX. I don't want to influence your decision, but if the decision is final, I would like to offer any support to the project that I can give.</div><div><br></div><div>> Indeed. The TI C5471 DSP/ARM chip seems to be virtually a predecessor of the Calypso.</div><div><br></div><div>I have quite a bit of experience working with these TI dual core chips and would be happy to help out as much as possible. With the ARM7/c5 family, I have developed OS support (uClinux) for the C5471, DSC21, DSC24, and DM270. Also the DM320 (ARM9/c5, Linux).</div><div><br></div><div>I founded this business in Costa Rica (http://www.ridgerun.com, also once called Cadenux). But have not been involved with the
more recent ARM11/Cortex A8/c6 chips.</div><div><br></div><div>> I'm already working on the IRQ subsystem and took a look at the UART. </div><div>> But there are open questions, see above...</div><div><br></div><div>There is a porting guide here may be helpful to you: http://nuttx.sourceforge.net/NuttxPortingGuide.html.</div><div>But it does a some "To be provided" sections -- particulary in the IRQ section.</div><div><br></div><div>> I have a c5 DSP bridge driver somewhere around on my backup disks as</div><div>> well. I never released it into NuttX because there was never any</div><div>> need. Perhaps that could be useful now.</div><div><br></div><div>These DSP bridge drivers present interfaces to load programs into the DSP and to support an integrated, seamless messaging system between the ARM7 and the DSP.</div><div><br></div><div>The DSP interfaces differ from chip to chip and the drivers that I was referring were
targeted for uClinux. However, if that is something you are interested in, I would be happy to do the port a driver and integrate DSP messaging with the NuttX messaging.</div><div><br></div><div>Greg</div><div><br></div></div></div></body></html>