Artesyn MOTLoad Firmware Package User's Manual (February 2015) - Manual (Page 275)

Safe Start and Alternate Boot Image
MOTLoad Firmware Package User’s Manual (6806800C24D) 275
E.6.1 Checksum Algorithm
The checksum algorithm is a simple unsigned word addition; that is, 4-byte addition, of each
word location in the image. The image must be word aligned. The content of the checksum
location in the header is not part of the checksum calculation. The algorithm is implemented
using the following code:
Unsigned int checksum(
Unsigned int *startPtr,/* starting address */
Unsigned int endPtr/* ending address */
) {
unsigned int checksum=0;
while (startPtr < endPtr) {
checksum += *startPtr;
startPtr++;
}
return(checksum);
}
E.6.2 Boot Image Flags
The image flags define various bit options that control how the boot loader executes the
image. These bit definitions are defined in the following table.
ImageOffset unsigned integer 1 Offset from header start to
entry
ImageFlags unsigned integer 1 Refer to Boot Image Flags on
page 275
ImageVersion unsigned integer 1 User defined
Reserved unsigned integer 8 Reserved for expansion
Name Type Size Notes
Table E-1 MOTLoad Image Flags
Name Value Interpretation
COPY_TO_RAM 0x00000001 Copy image to RAM at
ImageRamAddress
before execution