Building the Boot Table
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SPRUI07–March 2020
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Boot ROM
3. Run the hex conversion utility.
Choose the appropriate options for the desired boot mode and run the hex conversion utility to convert
the COFF file produced by the linker to a boot table.
Table 2-18 summarizes the hex conversion utility options available for the bootloader. See the
TMS320C28x Assembly Language Tools v18.1.0.LTS User's Guide for more information abut the
compiling and linking process, and for a detailed description of the hex2000 operations used to generate a
boot table. Updates will be made to support the I2C boot. See the Codegen release notes for the latest
information.
Table 2-18. Bootloader Options
Option Description
-boot Convert all sections into bootable form (use instead of a SECTIONS directive)
-sci8 Specify the source of the bootloader table as the SCI-A port, 8-bit mode
-spi8 Specify the source of the bootloader table as the SPI-A port, 8-bit mode
-gpio16 Specify the source of the bootloader table as the GPIO port, 16-bit mode
-bootorg value Specify the source address of the bootloader table
-lospcp value Specify the initial value for the LOSPCP register. This value is used only for the spi8 boot table format
and ignored for all other formats. If the value is greater than 0x7F, the value is truncated to 0x7F.
-spibrr value Specify the initial value for the SPIBRR register. This value is used only for the spi8 boot table format
and ignored for all other formats. If the value is greater than 0x7F, the value is truncated to 0x7F.
-e value Specify the entry point at which to begin execution after boot loading. The value can be an address or
a global symbol. This value is optional. The entry point can be defined at compile time using the linker
-e option to assign the entry point to a global symbol. The entry point for a C program is normally
_c_int00 unless defined otherwise by the -e linker option.
-i2c8 Specify the source of the bootloader table as the I2C-A port, 8-bit
-i2cpsc value Specify the value for the I2CPSC register. This value will be loaded and take effect after all I2C
options are loaded, prior to reading data from the EEPROM. This value will be truncated to the least
significant eight bits and should be set to maintain an I2C module clock of 7-12 MHz.
-i2cclkh value Specify the value for the I2CCLKH register. This value will be loaded and take effect after all I2C
options are loaded, prior to reading data from the EEPROM.
-i2cclkl value Specify the value for the I2CCLKL register. This value will be loaded and take effect after all I2C
options are loaded, prior to reading data from the EEPROM.
2.3.2 Example: Preparing a COFF File for eCAN Bootloading
This section shows how to convert a COFF file into a format suitable for CAN based bootloading. This
example assumes that the host sending the data stream is capable of reading an ASCII hex format file. An
example COFF file named GPIO34TOG.out has been used for the conversion.
Build the project and link using the -m linker option to generate a map file. Examine the .map file produced
by the linker. The information shown in has been copied from the example map file (GPIO34TOG.map).
This shows the section allocation map for the code. The map file includes the following information:
• Output Section
This is the name of the output section specified with the SECTIONS directive in the linker command
file.
• Origin
The first origin listed for each output section is the starting address of that entire output section. The
following origin values are the starting address of that portion of the output section.
• Length
The first length listed for each output section is the length for that entire output section. The following
length values are the lengths associated with that portion of the output section.
• Attributes/input sections
This lists the input files that are part of the section or any value associated with an output section.
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