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update-files.md

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Update Files

Structure

The update is contained within a password protected zip file with a signature appended to it. The last 256 bytes of update file is SHA256 signature, that is verified against publisher_cert.pem.

The zip contains the following

File Path Optional Description
jci_subord_cert.pem No Subordinate Certificate
publisher_cert.pem No Publisher Certificate
main_instructions.ini No Update instructions
versions.ini.gz Unknown Versions of update, versions the update is compatible with
bootstrap/ Yes Update for bootstrap section of SPI-NOR
cleandatapersist/ Yes Script to cleanup /mnt/data_persist/
compactwnn/ Yes Unknown
getnewflavour/ Yes Unknown
gps/ Yes Update for GPS firmware
ibc1/ Yes Update for IBC1 SPI-NOR:0x020000
linux1/ Yes Update for the main Linux Kernel
passwdupdate/ Yes Scripts to "update" the passwd file as well as authorized_keys
preloaddata/ Yes Unknown
resources/ Yes Unknown
rootfs1upd/ Yes rootfs files
usersettingsbackup/ Yes Unknown
usersettingscleanup/ Yes Unknown
usersettingsrestore/ Yes Unknown
vip/ Yes Update for the microcontroller that is used for CAN/LIN communications
checksumoption/ Yes Unknown
fail-safe/ Yes Failsafe image for SPI-NOR:0x0E0000
ibc2/ Yes Update for IBC2 SPI-NOR:0x040000

Certificate Chain

  • /jci/certificates/jci_root_cert.pem
  • update.zip/jci_subord_cert.pem
  • update.zip/publisher_cert.pem

Validation

  1. Root certificate integrity is validated.
  2. Subordinate certificate is checked against Root certificate
  3. Publisher certificate is checked against Subordinate certificate
  4. Signature is validated against Publisher certificate

main_instructions.ini

[Settings]

Fields:

  • PackageID
  • CompressionType
  • TotalStepsCount

[Instructions]

Fields

Keys Details
Count Contains the number of instructions
1
...
Count		 Contains the instruction details which are comma delimited in the format
Operation, Directory, step INI file, Count of instructions in step INI file
Available operations are Execute, ImageUpdate, FileUpdate

[DataStorage]

Fields

  • Count
  • UPType
  • ReTransmit