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SPNA241 August 2019 RM41L232 , RM42L432 , RM44L520 , RM44L920 , RM46L430 , RM46L440 , RM46L450 , RM46L830 , RM46L840 , RM46L850 , RM46L852 , RM48L530 , RM48L540 , RM48L730 , RM48L740 , RM48L940 , RM48L950 , RM48L952 , RM57L843 , TMS570LC4357 , TMS570LC4357-EP , TMS570LC4357-SEP , TMS570LS0232 , TMS570LS0332 , TMS570LS0432 , TMS570LS0714 , TMS570LS0714-S , TMS570LS0914 , TMS570LS10106 , TMS570LS1114 , TMS570LS1115 , TMS570LS1224 , TMS570LS1225 , TMS570LS1227 , TMS570LS20206 , TMS570LS20206-EP , TMS570LS20216 , TMS570LS20216-EP , TMS570LS2124 , TMS570LS2125 , TMS570LS2134 , TMS570LS2135 , TMS570LS3134 , TMS570LS3135 , TMS570LS3137 , TMS570LS3137-EP

CAN Bus Bootloader for Hercules Microcontrollers

7 ECC Generation for Application Code

As stated in Section 6, the ECC values for all of the ATCM program memory space must be programmed into the flash before SECDED is enabled. Before transferring the application image, the address and the image size are transferred first. The bootloader erases the flash sectors based on the address and size, and the ECC area corresponding to those flash sectors. If the image size is not equal to size of one flash sector or multiple sectors, the un-programmed area in the last erased sector contains ECC error.

One way to avoid this ECC error is to fill the un-programmed area by appending 0xFFFFFFFF to the file.

MEMORY
{
    VECTORS (X)     : origin=0x00010020 length=0x00000020
    /*sector 4/5 are used for application */
    FLASH_CODE (RX) : origin=0x00010040 length=0x8000 - 0x40  fill=0xFFFFFFFF
    FLASH0  (RX)    : origin=0x00018000 length=0x00200000 - 0x18000
    FLASH1  (RX)    : origin=0x00200000 length=0x00200000
    STACKS  (RW)    : origin=0x08000000 length=0x00001500
    RAM     (RW)    : origin=0x08001500 length=0x0007EB00
}