As Lars Andersson wrote: > Here's a command line example: > avrdude -cstk500v2 -B4 -pm16 -P/dev/ttyS0 -v -e -Uflash:w:main.hex:i,10,0,6
> Is this implemented in avrdude already or do I have to apply the patch and > recompile. Also, if not implemented is there a reason for this ? Reading the calibration data (per appnote AVR053) is supported through the -O option, but writing it to an arbitrary location is not supported. First, I'd like to see a more general syntax for the -U option. For example, the "m" file type (immediate value) is currently only useful for specifying fuses, but could also be extended to specify a location so it could be useful e.g. for modifying arbitrary EEPROM locations. Example: -U ee:w:@0x20,0x40,0x44:m to write bytes 0x40 and 0x44 starting at address 0x20. If we agree on something like this, it could then be applied to all address-less input methods (namely, arbitrary binary files), so you could e.g. also program a bootloader from a binary file: -U fl:w:@0x1f00,bootloader.bin:r Then, it should be possible to also "divert" the -O result to a different location but EEPROM address 0 that way. So far, nobody has made any much attempt towards such a more general solution, so I took it there's not much demand for it. I'm against a "special-cased hack" just for the calibration data. Regarding storing the data in flash, keep in mind that flash can never be programmed byte by byte, but only in terms of pages. Except for Xmega devices, erasing a page is not supported though, so the respective flash location must be 0xff (from a previous chip erase). I think this detail makes it completely impractical to store that value in flash. Note that this is *not* an AVRDUDE limitation but one of the programming interface of non-Xmega AVRs. -- cheers, J"org .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/ NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) _______________________________________________ avrdude-dev mailing list avrdude-dev@nongnu.org https://lists.nongnu.org/mailman/listinfo/avrdude-dev
