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How does the compiler deal with bank switching? We current are using 9s12DP256 processor which uses banked memory. If there is a document which I can read that would be helpful. Also this process use .5u SST flash, which requires a fixed length srecord. Does the current build tools properly format the srecord or do I need to execute the srecord convert uitil to properly format? Thanks |
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--- In , Phillip Mastroianni <phil@s...> wrote: > How does the compiler deal with bank switching? We current are using What compiler was that, again? |
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Individual compilers do it differently, there is no standard. Particular implementations can greatly effect the efficeincy of the code. The SST flash itself places no restrictions on the length of S-Records. This is a function of the programming software. Dave Phillip Mastroianni wrote: > How does the compiler deal with bank switching? We current are using > 9s12DP256 processor which uses banked memory. If there is a document > which I can read that would be helpful. Also this process use .5u SST > flash, which requires a fixed length srecord. Does the current build > tools properly format the srecord or do I need to execute the srecord > convert uitil to properly format? > > Thanks > > >. |
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FYI, the S12 devices use 0.25um split gate flash. Jim www.freegeeks.net ----- Original Message ----- From: "Phillip Mastroianni" <> To: <> Sent: Monday, February 21, 2005 8:46 PM Subject: [68HC12] HCS12 Bank Switch > > How does the compiler deal with bank switching? We current are using > 9s12DP256 processor which uses banked memory. If there is a document > which I can read that would be helpful. Also this process use .5u SST > flash, which requires a fixed length srecord. Does the current build > tools properly format the srecord or do I need to execute the srecord > convert uitil to properly format? > > Thanks > > > Yahoo! Groups Links > |
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Actually, the Flash limitation is in the hardware. Must write 16-bit aligned words at a time. In my compiler, GCC, I have the linker script align each rom section so it will end on the right note. The "easy" solution though is to use SRecCvt.exe (download from Freescale, or comes with some packages). It works in Linux too with wine. It's just what the Dr ordered. --- In , "Dr. David A. Perreault" <dap@p...> wrote: > The SST flash itself places no restrictions on the length of S-Records. > This is a function of the programming software. > > Dave > Phillip Mastroianni wrote: > > > How does the compiler deal with bank switching? We current are using > > 9s12DP256 processor which uses banked memory. If there is a document > > which I can read that would be helpful. Also this process use .5u SST > > flash, which requires a fixed length srecord. Does the current build > > tools properly format the srecord or do I need to execute the srecord > > convert uitil to properly format? > > > > Thanks > > > > > > > > > > > > > > >. > > > > |
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--- In , "Jefferson Smith" <imajeffs@h...> wrote: > > --- In , Phillip Mastroianni <phil@s...> wrote: > > How does the compiler deal with bank switching? We current are using > > What compiler was that, again? I would like to use http://m68hc11.serveftp.org/m68hc11_port.php |
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--- In , "phillipmastroianni" <phil@s...> wrote: > > --- In , "Jefferson Smith" <imajeffs@h...> > wrote: > > > > --- In , Phillip Mastroianni <phil@s...> > wrote: > > > How does the compiler deal with bank switching? We current are > using > > > > What compiler was that, again? > > I would like to use http://m68hc11.serveftp.org/m68hc11_port.php That is my favorite, because it's free with source code, and it is very powerful. The memory banks map to space above 0xffff. If you look at Appendix A in the "Reference Guide For D-Bug12 Version 4.x.x", it shows mapping like Linear Addr Range PPAGE 0xc0000 - 0xc3fff 0x30 In gcc-m68hc1x (the compiler you found), ppage 0x30 is mapped to the linear addr + 0x10000. In other words, GCC virtual addr PPAGE 0xd0000 - 0xd3fff 0x30 if you called a 'far' function which was placed in this region (ppage 0x30), the compiler automatically calls the function with the proper ppage value. |
