Follow-up Comment #3, patch #7896 (project avrdude):
It stops at that point under Linux since it segfaults. This
is because there are zero endpoint descriptors present, so
found->config->interface->altsetting->endpoint
equals 0 here:
memcpy(&dfu->endp_desc, found->config->interface->altsetting->endpoint,
sizeof(dfu->endp_desc));
If I conditionalize that memcpy() on ...->endpoint being != 0,
the Linux behaviour resembles the one under FreeBSD:
avrdude: Warning: USB bDeviceClass = 255 (expected 0)
avrdude: Warning: USB bDeviceSubClass = 1 (expected 0)
avrdude: Warning: USB bInterfaceClass = 0 (expected 255)
avrdude: Warning: Failed to read USB device string 1: error sending control
message: Broken pipe
avrdude: Warning: Failed to read USB device string 2: error sending control
message: Broken pipe
avrdude: Error: DFU_DNLOAD failed: error sending control message: Broken pipe
avrdude: Error: Failed to get DFU status: error sending control message:
Broken pipe
avrdude: Error: Failed to set memory unit 0x05 (signature)
avrdude: AVR device initialized and ready to accept instructions
Reading | | 0%
0.00savrdude: error reading signature data for part "ATmega32U2", rc=-1
avrdude: error reading signature data, rc=-1
avrdude done. Thank you.
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