Checksum Algorithm, Image Flags | Emerson MVME7100 manual

Checksum Algorithm				MOTLoad Firmware


	Name	Type	Size	Notes

	ImageOffset	unsigned integer	1	Offset from header start to entry

	ImageFlags	unsigned integer	1	Refer to Image Flags on page 95

	ImageVersion	unsigned integer	1	User defined

	Reserved	unsigned integer	8	Reserved for expansion

6.7.1Checksum Algorithm

The checksum algorithm is a simple unsigned word add of each word (4 byte) location in the image. The image must be a multiple of 4 bytes in length (word-aligned). The content of the checksum location in the header is not part of the checksum calculation. The calculation assumes the location to be zero. 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);

}

6.7.2Image Flags

The image flags of the header define various bit options that control how the image will be executed.

Table 6-2 MOTLoad Image Flags

Name	Value	Interpretation

COPY_TO_RAM	0x00000001	Copy image to RAM at ImageRamAddress before execution
IMAGE_MCG	0x00000002	Alternate MOTLoad image

IMAGE_POST	0x00000004	POST image

DONT_AUTO_RUN	0x00000008	Image not to be executed

zCOPY_TO_RAM

If set, this flag indicates that the image is to be copied to RAM at the address specified in the header before control is passed. If not set, the image will be executed in flash. In both instances, control will be passed at the image offset specified in the header from the base of the image.

zIMAGE_MCG

If set, this flag defines the image as being an Alternate MOTLoad, as opposed to USER, image. This bit should not be set by developers of alternate boot images.

MVME7100 Single Board Computer Installation and Use (6806800E08A)

MVME7100 specifications

The Emerson MVME7100 is a powerful and versatile embedded computing platform designed for demanding applications in various fields, including telecommunications, aerospace, and defense. It offers enhanced performance, a wide range of connectivity options, and robust security features, making it suitable for mission-critical operations.

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Emerson MVME7100 manual Checksum Algorithm, MOTLoad Image Flags, Name Value Interpretation

Models: MVME7100