mbirth/wiki.mbirth.de
1
0
Fork 0
mirror of https://github.com/mbirth/wiki.git synced 2024-12-24 22:54:09 +00:00
Code Issues Releases Wiki Activity

Fix line breaks.

Browse Source
This commit is contained in:
Markus Birth 2016-12-27 13:39:36 +01:00
parent 46e47f4d46
commit ea0faed7c5
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
know-how/hacking/audiomate/_posts/2016-02-01-firmware.md
View File

@ -81,15 +81,15 @@ Checksum
A user called "tidy" has found out what the header bytes are meaning and how checksum is compiled:
> bytes 0-3: file magic `UMDA`
> byte 4: Platform *
> byte 5+7: Customer * * (whatever that means its extracted from decompiling the header parse code)
> byte 6: Model *
> byte 8-10: Version number
> byte 11-12: build number (little endian)
> byte 13: flags seem to have impact on the update process but I'm not sure in which function
> bytes 0-3: file magic `UMDA`
> byte 4: Platform *
> byte 5+7: Customer * * (whatever that means its extracted from decompiling the header parse code)
> byte 6: Model *
> byte 8-10: Version number
> byte 11-12: build number (little endian)
> byte 13: flags seem to have impact on the update process but I'm not sure in which function
> byte 14-15: checksum
>
> The checksum is calculated by interpreting the file as a little endian int16 stream, adding up its
> values, truncating the 16LSBs after every addition and calculating the value that is missing to
> sum up to 0x10000. I.e. if one calculates the checksum as described over the whole file including