User Images - SMART Embedded Computing MVME3100 Installation And Use Manual

User Images

If set, this flag indicates that the image is not to be selected for automatic execution. A user,
through the interactive command facility, may specify the image to be executed.
MOTLoad currently uses an Image Flag value of 0x3, which identifies itself as an
Alternate MOTLoad image that executes from RAM. MOTLoad currently does not
support execution from flash.
3.10.3 User Images
These images are user-developer boot code; for example, a VxWorks bootrom image.
Such images may expect the system software state to be as follows upon entry:
The MMU is disabled.

L1 instruction cache has been initialized and is enabled.

L1 data cache has been initialized (invalidated) and is disabled.

L2 cache is disabled.

L3 cache is disabled.

RAM has been initialized and is mapped starting at CPU address 0.

If RAM ECC or parity is supported, RAM has been scrubbed of ECC or parity

errors.
The active flash bank (boot) is mapped from the upper end of the address space.

If specified by COPY_TO_RAM, the image has been copied to RAM at the address

specified by ImageRamAddress.
CPU register R1 (the stack pointer) has been initialized to a value near the end of

RAM.
CPU register R3 is added to the following structure:

typedef struct altBootData {
} altBootData_t;
60
unsigned int ramSize;/* board's RAM size in MB */
void flashPtr;/* ptr to this image in flash */
char boardType[16];/* name string, eg MVME3100 */
void globalData;/* 16K, zeroed, user defined */
unsigned int reserved[12];
MVME3100 Single Board Computer Installation and Use (6806800M28H)
MOTLoad Firmware