Quectel LTE Module Series User manual

SC20 Secure Boot
User Guide
LTE Module Series
Rev. SC20_Secure_Boot_User_Guide_V1.0
Date: 2016-09-26
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LTE Module Series
SC20 Secure Boot User Guide
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About the Document
History
Revision
Date
Author
Description
1.0
2016-09-26
Barret YUAN
Initial
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Contents
About the Document................................................................................................................................ 2
Contents.................................................................................................................................................... 3
Table Index ............................................................................................................................................... 4
Figure Index.............................................................................................................................................. 5
1Introduction....................................................................................................................................... 6
2MSM8909 Secure Boot Flowchart.................................................................................................... 7
3Configure OEM Key .......................................................................................................................... 9
4Generate Secure Images ................................................................................................................ 10
5Generate sec.dat ............................................................................................................................. 13
6Download Image via QFIL............................................................................................................... 14
7Appendix A Reference.................................................................................................................... 15
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Table Index
TABLE 1: OEM KEY LIST.................................................................................................................................... 9
TABLE 2: DIRECTORY LIST OF SIGNED IMAGE AND SOURCE IMAGE.......................................................11
TABLE 3: TERMS AND ABBREVIATIONS........................................................................................................ 15
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Figure Index
FIGURE 1: MSM8909 SECURE BOOT FLOWCHART ...................................................................................... 7
FIGURE 2: SIGNED IMAGE STORAGE DIRECTORY..................................................................................... 10
FIGURE 3: SEC.DAT CONSTRUCTION........................................................................................................... 13
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1Introduction
This document mainly introduces how to use the secure boot function of Quectel SC20 module.
Secure boot refers to the boot up sequence that establishes a trusted platform for secure applications. It
starts as an immutable sequence that validates the origin of the code using cryptographic authentication
so only authorized software can be executed. The boot up sequence places SC20 in a known security
state and protects it against binary manipulation of software and reflashing attacks.
A secure boot system adds cryptographic checks to each stage of the boot up process. This process
asserts the authenticity of all secure software images that are executed by SC20. The additional check
prevents any unauthorized or maliciously modified software from running on SC20. Secure boot is
enabled through a set of hardware fuses. For the code to be executed, it must be signed by the trusted
entity identified in the hardware fuses.
The flow to enable secure boot:
1. Configure OEM Key. The new keys can be used to sign images and generate sec.dat
2. Generate secure images, download signed images (use fastboot or QFIL tool)
3. Generate sec.dat and download it to SC20. Once secure boot fuses are blown, the device cannot
use other keys.
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2MSM8909 Secure Boot Flowchart
Figure 1: MSM8909 Secure Boot Flowchart
1. Power on the system and take MSM8909AP CPU out from RESET.
2. Cortex-A7 APPS PBL:
a. Loads, executes, and authenticates the SBL1 segment #1 from SC20 to L2 (as TCM).
b. Loads, executes, and authenticates SBL1 segment #2* (DDR/SDI equivalent) to RPM code RAM,
then jumps to SBL1.
3. SBL1#1
a. Loads and authenticates the QSEE/TZ image from the boot device to DDR.
b. Loads and authenticates the RPM firmware image from the boot device to RPM code RAM.
c. Loads and authenticates the HLOS APPSBL image from the boot device to DDR.
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4. SBL1 #1 transfers execution to QSEE/TZ.
5. QSEE/TZ sets up secure environment and brings RPM out of RESET to start execution of RPM
firmware.
6. QSEE/TZ jumps to HLOSAPPSBL to start execution.
SBL1 segment#2 is equal to DDR driver + SDI equivalent copied to RPM code RAM.
DDR is initialized by SBL1 segment#2 and part of the SDI functionality included in SBL1 segment#2.
7. HLOS APPSBL loads and authenticates the HLOS kernel.
8. HLOS kernel:
a. Loads the Modem Boot Authenticator (MBA) to DDR via PIL.
b. Brings modem DSP Q6 out of RESET.
c. Loads the AMSS modem image to DDR via PIL.
c’. Modem PBL copies the MBA from DDR to modem TCM, authenticates MBA and finally jumps to
MBA image.
c”. MBA authenticates modem image and then jumps to modem.
d. HLOS loads the Pronto image to DDR via PIL.
d’. HLOS brings Pronto out of RESET and Pronto image starts execution.
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3Configure OEM Key
The flow to configure OEM key is illustrated below:
1. Extract sectool.tar, and then overwrite the directory “common/tools/sectools”.
2. Extract makeCrt.tar, run makecrt.dat, and then copy new keys to
“common/tools/sectools/resources/data_prov_assets/Signing/Local/oem_certs”
3.
sectool.tar and makeCrt.tar are available in the “Tools”directory.
Table 1: OEM Key List
Keys
Path
Description
qpsa_rootca.key
common\tools\sectools\resources\data_prov_assets\
Signing\Local\oem_certs
Root CA private key
qpsa_rootca.cer
common\tools\sectools\resources\data_prov_assets\
Signing\Local\oem_certs
Root certificate
qpsa_attestca.key
common\tools\sectools\resources\data_prov_assets\
Signing\Local\oem_certs
Attestation CAprivate key
qpsa_attestca.cer
common\tools\sectools\resources\data_prov_assets\
Signing\Local\oem_certs
Attestation CA certificate
NOTE
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