On Tue, Jun 1, 2010 at 1:56 PM, gcembed <gcem...@gmail.com> wrote: > Hello, > I have added a new command for stm32x : mass_erase_unlock > This function combine "stm32x unlock 0" + reset to apply unlock + "stm32x > mass_erase 0" > In this way, it is more easier to handle the unlock sequence and makes the > (annoying) reset procedure transparent. > After calling mass_erase_unlock, flash write_image can immediately called. > Here is an example of my flashing procedure : > > init > jtag_khz 1000 > reset_config trst_and_srst > halt > flash probe 0 > flash protect 0 0 last off > stm32x mass_erase_unlock 0 > flash write_bank 0 file.bin 0 > flash protect 0 0 last on > verify_image file.bin 0 > > Thanks > Gaëtan
I like the idea, it would be very convenient to have a single command to always put the chip in a well defined, cleared state. Perfect for programming scripts, which today need to assume that the flash is locked. However... If the flash is locked, the unlock procedure will perform a mass erase, so the second mass erase will just waste time and flash erase cycles. Plus, the SP and PC could have different values after the procedure depending on whether the protection was active or not (see the test I posted yesterday). I would prefer something like the following pseudo code to get a consistent state with minimum number of operations. read option byte; if (readout protection active) unlock; else mass_erase; reset; Then one starts to think why we need this new command in addition to the separate unlock and mass_erase commands. Unlock already implies mass_erase. And is there ever a reason to (try to) do a mass_erase on a locked flash without wanting to unlock it? Or to mass_erase or unlock without resetting the core afterwards (how about when running from ram?). The operations seem to go hand in hand. Maybe we only need one command to do it all. /Andreas _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
