RAM 6.0 BUX II Series Guía de usuario descargar pdf (Pagina 21)

2 Overview of a BSP

2.2 Boot Sequence

over the network. This image requires a large ROM space and a large RAM

space. This image can not be run from ROM.

vxWorks.st_rom

A VxWorks standalone image programmed into flash that decompresses itself

to RAM for execution. This image includes a linked-in symbol table so that a

complete VxWorks image with shell and symbol table is put into ROM.

Because these systems tend to be large, ROM compression is used. This rule

also creates vxImage.o for use as a “core” file (to provide a symbol table) for

the target server or other host-based debugger. This image uses less ROM than

a vxWorks image and requires a large RAM space.

vxWorks.res_rom

A VxWorks image programmed into flash. This image copies the data segment

from flash into RAM, but continues to fetch instructions from flash. This image

includes a linked-in symbol table so that a complete VxWorks image with shell

and symbol table is put into ROM. This type of image uses less RAM than a

vxWorks image and requires a large ROM space. In general, execution is slow

for all ROM-resident images, as compared to RAM-resident images.

vxWorks.res_rom_res_low

This image is similar to vxWorks.res_rom, but sometimes starts the data

segment in RAM closer to

RAM_LOW_ADRS on some architectures.

vxWorks.res_rom_nosym

A VxWorks image programmed into flash. This image copies the data segment

from flash into RAM, but continues to fetch instructions from flash. This image

does not include a symbol table. This image uses a small amount of RAM and

requires a large ROM space. This type of image has a quick start time but

executes more slowly than a RAM image.

vxWorks.res_rom_nosym_res_low

This image is similar to vxWorks.res_rom_nosym, but sometimes starts the

data segment in RAM closer to

RAM_LOW_ADRS for some architectures.

bootrom

A VxWorks image with a boot loader application that is programmed into

flash. This image decompresses itself into RAM for execution. This image

requires a minimal amount of ROM space and a large RAM space.

NOTE: This image format may require larger EEPROMs. The user is advised

to check the macros for ROM sizes and offsets for compatibility.

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RAM 6.0 BUX II Series Guía de usuario Pagina 21