Drive dissapears on v3.8.0 - circuitplayground - m0

adafruit / uf2-samdx1

MSC bootloader (based on UF2) for SAMD21

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Closed pelikhan closed 4 years ago

pelikhan commented 4 years ago

I dropped the v3.8.0 bootloader on a CPX M0. The device enters bootloader mode (all leds green) but it fails to show the drive:

dhalbert commented 4 years ago

Thanks -- I had tested this but something's going wrong. I've made 3.8.0 be a pre-release while I investigate. It seems to work fine with SAMD51.

dhalbert commented 4 years ago

The SAMD21 fuses are getting set to 0xffffffff, which is enabling a very short WDT (watchdog timer).

To get the board up again, write these values to the fuses (from my .gdbinit).

define fusefix-samd21
  # sets BOOTPROT to protect 8kB
  set *0x00804000 = 0xD8E0C7FA
  set *0x00804004 = 0xFFFFFC5D
end

Also set 0x2000 and 0x2004 to all zeros, to prevent the updater from running again.

dhalbert commented 4 years ago

Fix doesn't work, checking further. I'll stop rushing.

pelikhan commented 4 years ago

No worries!

From: Dan Halbert notifications@github.com Sent: Wednesday, April 8, 2020 11:58:55 AM To: adafruit/uf2-samdx1 uf2-samdx1@noreply.github.com Cc: Peli de Halleux jhalleux@microsoft.com; Author author@noreply.github.com Subject: Re: [adafruit/uf2-samdx1] Drive dissapears on v3.8.0 - circuitplayground - m0 (#112)

Fix doesn't work, checking further. I'll stop rushing.