<trabucayre>
weird. This information isn't stored into flash
<steve|m>
I patched openfpgaloader to that 'new' idcode, and for example loading sram works from the output of the loader, but the fpga itself doesn't, not even a blinky
<trabucayre>
if your bitstream has the real idcode it will not be accepted
<trabucayre>
but it's the first time I see IDCODE changes
<trabucayre>
d
<steve|m>
the bitfile I initially programmed doesn't use any of the dual-purpose pins, but I also tried pulling MODE high and JTAGSEL low, no change, always 0x0100881b
<steve|m>
also tried with lower clock etc.
<steve|m>
at this point I'm quite puzzled
<steve|m>
just one bit difference, 8 instead of 9
<trabucayre>
It look like the hardcoded IDCODE was reprogrammed
<trabucayre>
And of course this type of informations aren't present into gowin's datasheet...
<steve|m>
my next thought would be patching the original programming tool to this idcode and try program/erase with that, but that is a big chunk of compiled python garbage
<steve|m>
a couple of weeks ago I successfully programmed the internal flash with the gowin programmer
<steve|m>
but since then only used SRAM loading with openfpgaloader
<steve|m>
also now with the patched idcode, if I try to write the flash:
<steve|m>
CRC check : FAIL
<steve|m>
Read: 0x00000000 checksum: 0x0856
<trabucayre>
I don't remember but idcode is maybe integrated to the formula to computre CRC
<trabucayre>
when you have tried to flash have you seen error related to libftdi or libusb ?
<trabucayre>
usb interface is sometime a bit unstable, and it's depends on your env, cable, usb hub, etc.
<steve|m>
no, everything went fine, I was very surprised when I replugged the board and it was not detected anymore
<trabucayre>
nothing in dmesg?
<trabucayre>
with openFPGALoader's master branch?
<steve|m>
nothing in dmesg
<steve|m>
no, 0.11.0 from AUR
<steve|m>
now for the patched IDCODE experiments I'm using master though..
<steve|m>
huh, what is interesting is that writing/verifying the external flash works
<trabucayre>
external yes, but you can't boot from external flash :-(
<steve|m>
shouldn't that be possible by pulling MODE high?
<steve|m>
it doesn't work here anymore, though..
<steve|m>
well.. that thing is pretty much bricked.. luckily a tang nano 9K should arrive in the next days
<trabucayre>
too bad :-/
<trabucayre>
I have seen a couple of gw1n bricked but never with a wrong IDCODE
<trabucayre>
bricked for flash access but working for sram
<steve|m>
I have to take a look at the DONE pin
<steve|m>
done does a short pulse to high and then is low again