> -----Original Message----- > From: openocd-development-boun...@lists.berlios.de [mailto:openocd- > development-boun...@lists.berlios.de] On Behalf Of David Brownell > Sent: zaterdag 14 november 2009 20:26 > To: openocd-development@lists.berlios.de > Subject: Re: [Openocd-development] Embedding OpenOCD on low > endmicrocontroller. > > On Friday 13 November 2009, Martín Sebastián Baudino wrote: > > But now I'm been asked to look at the code and see if it is possible to > > actually embed it on an STR7 board, which we use to automatically test > other > > boards. Our goal would be (for now) to just flash another ARM > > microcontroller with a small program, to test some peripherals like UARTs > > and SPIs. > > > > At first hand, I don't see this as a trivial task, and I'd like to ask for > > your advice, since you know the code and are surely more experienced with > it > > than I am. > > I think you'll find that OpenOCD relies on a bunch of other > infrastructure, and you'd need to start by finding what parts > of that already exist. TCP networking, file system access, > and I/O to the JTAG adapter are places to start. > > As noted already, one trivial solution is to build on top > of Linux. You would have a little work to drive the JTAG
Linux is the way to go. Altough you might be able to do without. This depends whether your environment is POSIX / BSD sockets compliant. I have created such an environment on an ARM7TDMI and I do manage to get some Linux applications to compile (for example an SSL stack). Stuff like file I/O needs to be disabled or worked around. > efficiently -- SPI can give you high speed shift operations, > and GPIOs can solve the state changes -- but this is is well > within the capabilities of a 32-bit uC once the other software > support is resolved. Getting fast JTAG isn't really an issue. I'm using OpenOCD on a 330MHz MIPS platform (together with a fast buffered JTAG interface in an FPGA). It turns out 99% of the time is spend putting the JTAG stream together. If I used bit-banging it wouldn't have made a difference. I solved this by bypassing the OpenOCD JTAG core for most used JTAG operations. Nico Coesel _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
