03:34 <safarir> Hi. I am trying to use openocd 0.12.0 with a picoprobe and I keep getting the error: "Error: 985 22081 cmsis_dap.c:880 cmsis_dap_swd_read_process(): CMSIS-DAP transfer count mismatch: expected 12, got 5". I was wondering if someone have any pointer to get me around this issue. Thank you

12:40 <Haohmaru> kinda offtopic but i wonder how to deal with a bootloader for cortex M4.. will i think i'll have a hard time debugging it, am i right?

12:40 <karlp> how so?

12:41 <karlp> you can use "file" in gdb to switch from the bootloader elf to the app elf and continue acros the boundary

12:41 <karlp> from the debuggers point of view it just keeps executing code.

12:42 <Haohmaru> i mean while i'm coding the bootloader.. i need a custom bootloader so i can't just take an existing one which probably works well already

12:42 <karlp> the bootloader is still just another app. you debug it normally...

12:43 <Haohmaru> okay, i'll pretend everything's gonna be wonderful and continue for now ;P~

12:44 <karlp> I recommend not trying to develop the secondary app at the same time of course :)

12:44 <Haohmaru> on the other hand.. i've only written one custom bootloader so far, for xmega, and this cortex M4 is kinda more complex

12:44 <karlp> I find it convenient to have two "apps" that are very easy to tella part, (different blink patterns or uart output for instance) so you can keep using the bootloader to go between them and see that it's working.

12:45 <Haohmaru> and i had no debugger with the xmega

12:45 <Haohmaru> the real program already has been written, it's written as a "solo" program tho, it's flashed with the debugger onto the beginning of flash

12:46 <Haohmaru> so i guess just like with the xmega, the beginning of flash should have the bootloader, and thus the app should be recompiled and "moved" back

12:47 <karlp> that's the common way, yes.

12:47 <Haohmaru> it seems this chip doesn't have a special "boot" section, instead it has some BANK business and afaiu the whole flash is sliced in regions which can be locked individually

12:51 <Haohmaru> i think the bank business just swaps the addresses of the two big banks, which would allow things like having two apps, one in bank A, another one in bank B, then a bootloader which always jumps to bank A, but if you swap them - the bootloader will effectively jump to the second program... this without actually swapping all the data in flash