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32blit / 32blit-sdk

32blit SDK
https://32blit.com
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dfu-util: Invalid DFU suffix signature #681

Open ali1234 opened 3 years ago

ali1234 commented 3 years ago

When flashing the latest firmware on linux I get this warning message:

dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!

I am not sure what this means but we should look into it to avoid it breaking at some point in the future.

I suspect it means there is some invalid header on the firmware.dfu.

Gadgetoid commented 3 years ago

The suffix is this portion here: https://github.com/32blit/32blit-sdk/blob/dd9d68df7246eb220abc71168d7e5ceee4cf3de6/tools/dfu#L117-L122

Which, according to this datasheet: http://rc.fdr.hu/UM0391.pdf

● The bcdDevice field gives the firmware version contained in the file, or 0xFFFF if ignored. ● The idProduct and idVendor field give the Product ID and Vendor ID respectively of the device that the file is intended for, or 0xFFFF if the field is ignored. ● The bcdDFU field, fixed to 0x011A, gives the DFU specification number. This value differs from that specified in standard DFU rev1.1. ● The ucSignature field contains a fixed string of three unsigned characters (44h, 46h, 55h). In the file they appear in reverse order, allowing valid DFU files to be recognized. ● The bLength field, currently fixed to 16, gives the length of the DFU Suffix itself in bytes. ● The dwCRC (Cyclic Redundancy Check) field is the CRC calculated over the whole file except for the dwCRC data itself

And to meet the conditions for the CRC:

https://github.com/32blit/32blit-sdk/blob/dd9d68df7246eb220abc71168d7e5ceee4cf3de6/tools/dfu#L125-L130

This all looks right, insofar as there isn't much to get wrong.

Maybe - contrary to the comments at the top of the DFU tool - the suffix should be included in the file length: https://github.com/32blit/32blit-sdk/blob/dd9d68df7246eb220abc71168d7e5ceee4cf3de6/tools/dfu#L55

Edit: "DFU File Format" PDF attached here for posterity: DFU-File-Format-UM0391.pdf

Gadgetoid commented 3 years ago

P.S. What's your DFU Util version and flash command?

On Ubuntu I see a different flavour of wrong:

dfu-util -D firmware.dfu -d 0x483:0xdf11 -a 0
dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

Opening DFU capable USB device...
ID 0483:df11
Run-time device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 011a
Device returned transfer size 1024
dfu-util: Error: File ID 0483:0000 does not match device (0483:df11 or 0483:df11)

IE: The DFU file has 0000 as the Product ID so it will refuse to flash.

ali1234 commented 3 years ago

Okay I found the problem. I typed firmware.bin instead of firmware.dfu and apparently this actually works, but produces the warning because no suffix.

ali1234 commented 3 years ago

0000 is probably because of this:

https://github.com/32blit/32blit-sdk/blob/master/tools/dfu#L190

ali1234 commented 3 years ago

Over in the new DFU tool the default is still 0 for product ID:

https://github.com/32blit/32blit-tools/blob/master/src/ttblit/core/dfu.py#L121

Gadgetoid commented 3 years ago

That's definitely an oversight, should be df11. Me abandoning DFuSe in favour of Linux has not helped this.