Date: Mon, 29 Nov 2021 17:54:20 +1030 From: Daniel O'Connor via hackers <hackers@freebsd.org> To: Daniel Braniss <danny@cs.huji.ac.il> Cc: freebsd- <hackers@freebsd.org> Subject: Re: usb serial - need quirk? Message-ID: <A90E6140-3C80-4512-A337-C4827AEC8128@dons.net.au> In-Reply-To: <D7FBBD72-5655-4F68-A539-7F2012A7D09A@cs.huji.ac.il> References: <11EBCD70-3259-4E4D-8B9C-9F25364BC73C@cs.huji.ac.il> <20F9C20E-BB89-4FC1-A339-171447368AD2@dons.net.au> <D7FBBD72-5655-4F68-A539-7F2012A7D09A@cs.huji.ac.il>
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> On 29 Nov 2021, at 17:35, Daniel Braniss <danny@cs.huji.ac.il> wrote: >>> it=E2=80=99s the last line that I think is causing failure to flash = the device (probably needs the break to set the speed?) >>=20 >> Why would it need break to set the speed? > don=E2=80=99t know, but I=E2=80=99ve seen in the past serial stuff = that needed the break to synchronize. >>=20 >>> any ways, is there some fix for this? >>=20 >> You didn't actually post the problem you are having so it's = impossible to say :) >> I assume esptool fails but it would be helpful if you posted the = output. > the flashing keeps failing with: > Chip is ESP32-C3 (revision 3) > Features: Wi-Fi > Crystal is 40MHz > MAC: 7c:df:a1:a3:61:74 > Uploading stub... >=20 > A fatal error occurred: Failed to write to target RAM (result was = 01070000) >>=20 >> I haven't used an ESP32-C3 but all of the other ESP's don't have USB = built in so it depends what USB UART you have on your board - any idea = which one it it? > all the other esp32 I have work fine, it=E2=80=99s this esp32c3 that = fails. > anyways, i got hold of a ttl to usb from m5stack, and after some = fiddling got it to flash! > this chip is CP2104, > so the problem seems to be in the driver for the unknown chip on this = esp32c3 - no > indication in the diagrams, nor can I read the micro words on the chip = :-( I had a look at the ESP32-C3 datasheet and it *does* have a USB = interface built in and it talks about a CDC-ACM virtual serial port = which matches what you see. The only ACM quirk I can see is UQ_ASSUME_CM_OVER_DATA so you could try = that I suppose.. (See the usb_quirk man page) -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum
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