On Tuesday 12 June 2007 16:21, Trevor Kellaway wrote: > Alex, > > > I had another look at Freescale-chc12.cmake. > > > > I guess you have different projects using this controller ? > > Yes, each system will generally have its own custom link.prm. > > > In the file you have the cache variables HC12_LINK_PRM_FILE, > > HC12_MEMORY_MODEL_LETTER and HC12_CORE. I guess they don't > > depend on preferences of the users but on how the actual > > hardware for this project looks like. Does this mean in order > > to build these projects correctly the user/developer has to > > adjust these variables manually to the correct values for the > > target hardware ? > > The intention was to provide a default case, which will work for small > programs, but in most cases this will be overridden. > The layout is generally dependent on the software, data and functions > can be placed in custom segments, which are then located based on > link.prm. > > The HC12 has fixed on-chip resources, FLASH (typically 64KB to 512KB) > and RAM (8KB to 32KB, yes KB not MB!), so in this case the hardware is > fixed. It can has an optional external address bus, where you can
Not too long ago I also did some programming e.g. on a PIC16, which had 2k word program memory (2 k word != 2048 byte, since one word is 14 bit) and 256 byte (not KB ! ;-) of RAM. > connect additional FLASH / RAM or peripherals, in this case the memory > map is dependent on the project's hardware. So, HC12_CORE is a hardware feature. HC12_LINK_PRM_FILE mainly too, since the layout has to match the available memory. HC12_MEMORY_MODEL_LETTER can then be selected. > You're right, it would make more sense for Freescale-chc12-hc12.cmake to > be included first, so this could act as an override for defaults in > Freescale-chc12.cmake. Usually you first set the defaults and then you override them with more specific settings, but this doesn't work for your case. Hmm. I switched the order of the two in cvs for now, let's see how it works out. Please try current cvs. Alex _______________________________________________ CMake mailing list CMake@cmake.org http://www.cmake.org/mailman/listinfo/cmake
