Firmware User Manual (AE-step)
19
Revision 1.02
2019-04-24
TLE984x Firmware User Manual
Boot Strap Loader (BSL)
4
Boot Strap Loader (BSL)
The BSL (Boot Strap Loader) module supports handling of message-based command request and response
communication over the serial LIN interface. The received command messages are parsed and executed
according to the LIN or FastLIN protocol. Details about this message protocol are given in
Protocol (Version 2.0)” on Page 38
The device supports the following serial interfaces :
- LIN
- Fast-LIN (LIN interface using the UART protocol)
shows the various software submodules in the BSL module. The shared protocol is handled on a
single protocol level that processes all messages described in
“BSL commands - Protocol (Version 2.0)” on
.
Figure 4-1 BSL Architecture
All command messages are encapsulated in an interface-specific frame format. This format includes specified
parameters, such as a checksum calculation and overall message size. Also specified on this level is whether
the interface is used as a peer-to-peer connection or as a master-slave-bus communication, which includes
device node addressing. This interface-specific frame handling is implemented in the interface-specific
protocol layer (e.g. LIN protocol).
The BSL protocol layer performs the command execution based on the parsed BSL commands. This results in
programming of the NVM, NVM CS (Configuration Sector), downloading to RAM or execution of NVM/RAM
code. It also includes the aspect that some commands are blocked based on applied hardware protection or
boot mode selection.
4.1
BSL overview
In this chapter, more details about the BSL mechanisms are provided.
BSL Protocol
BSL
FAST-LIN
Protocol
UART
HAL/Drv
Libraries
(used by all
modules)
Timer
NVM /
CS
NVM
HAL
LIN
Protocol
LIN
HAL/Drv
