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espressif / esptool

Espressif SoC serial bootloader utility
https://docs.espressif.com/projects/esptool
GNU General Public License v2.0
5.54k stars 1.38k forks source link

Custom flash tool flashing data and not verifying #302

Closed nkolban closed 6 years ago

nkolban commented 6 years ago

I am working on a custom flash tool in JavaScript using Node.js. My tests are progressing well and I thought I had it all working. I can write into arbitrary flash and I had tested it by reading back and validating that the checksums on what I wrote was the same as what I read back. However, the esptool verify_flash is reporting a problem.

I have a file called bootloader.bin. This wants to be flashed to address 0x1000 and has a length of 18032 bytes. I run my Node.js app and it claims it succeeds. At this point I have bootloader.bin on my filesystem and the belief that what is in flash is now the same.

I now use

esptool read_flash 0x1000 18032 temp.bin

I now have two files. My original bootloader.bin and temp.bin (as read back from flash). When I take a checksum using md5sum against both files they report identical and using cmp -l no bytes differ in comparison. They are the same file. This raises my confidence that what is in flash is what what I expected.

Now comes the mystery ... when I run verify_flash using:

esptool verify_flash 0x1000 bootloader.bin

we get the following response:

esptool.py v2.3.1
Connecting........__
Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Flash params set to 0x0220
Verifying 0x4670 (18032) bytes @ 0x00001000 in flash against bootloader.bin...
-- verify FAILED (digest mismatch)

A fatal error occurred: Verify failed.

... and I am at a loss to explain.

nkolban commented 6 years ago

Closing after reading and understanding ... https://github.com/espressif/esptool#verifying-flash

zaphod-42 commented 5 years ago

Did you manage to get a nodejs version of esptool working without the python dependency? I was hoping to implement the same thing and came across this thread while looking for existing options... thanks!

alexandruradovici commented 4 years ago

Same question as @zaphod-42 here about the node implementation.

kolban-google commented 4 years ago

I got it running ... but it was work for hire for a 3rd party who owns the rights and source. This means that there is little I can say about it. In the end, I did find that study of the esptools and the specification of the data structure as documented by Espressif was sufficient in the end.