> On Sep 5, 2017, at 4:37 PM, Peter Maydell <peter.mayd...@linaro.org> wrote: > > On 5 September 2017 at 20:30, William Mahoney <wmaho...@unomaha.edu> wrote: >> Thanks Thomas. One more question. Somewhere there must be a "what >> parts to look for where” document. You know, a “If you are interested >> in the device support for CPU XYZ, you look in the …XYZ directory” etc. > > There's no document particularly. The rough structure is that > devices live in hw/<category> (eg hw/char for UARTs), SoC > models and board models live in hw/<architecture> (hw/m68k > for m68k and coldfire), and the CPU emulation itself lives > in target/<architecture>/.
OK let me take a day and do some poking at it. It should be OK to do a “make distclean” and rebuild just certain parts, I assume. > >> I’d like to find this and/or anything else to clue me in before >> starting as to the level of difficulty to add 5282. I mean, I >> have decades of “C” background, I know the 5282 well, but am I >> going to be 10 days or 10 weeks? > > This depends a lot on how different the 5282 is from what > we currently support (5206 and 5208, from the looks of things). It’s like a 5208 but with additional on-chip I/O. Some of it is simple, like the UARTs are identical I think. Some parts are new, on-chip FLASH and SRAM, CAN bus, ... > Do you need any/all of: > * new CPU instructions ? Nope. This is the good part, the 5282 and the 5208 use the exact same ISA. > * other new CPU features ? > * a new SoC ? > * new devices (UART, timer, etc etc) that aren't in the > set we currently emulate ? Yes. I have both User Guide PDFs from Moto and I can get a definitive list of exactly what is new. The 5282 is essentially “a 5208 with these additional goodies”. > * a new board model that uses this new CPU ? > or will what we have at the moment be all you need in > one or more of those areas? There is a 5282 eval board that I may be able to borrow from my past life. > > Depending on the answers it could be anywhere betwen 10 > days and 10 weeks… Hey, I appreciate you narrowing it down! :-) Bill > > thanks > -- PMM
