Eurotech ZEUS Manual de usuario descargar pdf (Pagina 63)

Arcom Embedded Linux Technical Manual RedBoot

Updating the entire Flash

As well as updating individual portions of the Flash, it may also be desirable to reload

the entire Flash array, for example to reload the Flash image the board shipped with.

To update the entire Flash you must first load the image into RAM as described in the

section Loading images into RAM

on page 57. Once the image is in RAM you may

need to unlock the Flash, as described above, before using the fis write command to

write the image into Flash.

RedBoot> load –r –b %{FREEMEMLO} flash.img

RedBoot> fis unlock –f 0 –l <FLASH_SIZE>

RedBoot> fis write –f 0x0 –b %{FREEMEMLO} –l <FLASH_SIZE>

FLASH_SIZE is the size of the Flash in bytes. For an F16 board this would be

0x1000000.

Executing an image

There are two commands that can be used to execute an application or another

operating system under RedBoot. They are go and exec. Typically the go command is

used to execute an application while exec is primarily designed to launch Linux.

The go command jumps directly to the supplied virtual address. If no address is given,

it either jumps to the entry address of the most recently loaded image (which could be

specified by the FIS table entry), or it may default to the load address of the image.

The MMU is left enabled and set up and the processor is left in privileged mode. For

example, if your application binary is loaded and linked to run at virtual address

0x200000, the following command jumps to the application:

RedBoot> go 0x200000

At this point, control is transferred directly to your application at 0x200000. The

application may choose to continue using the existing MMU settings or may tear down

the current configuration and reinitialize using the desired options.

exec

The exec command disables the MMU before jumping to the physical address supplied.

The primary purpose of this command is to execute a Linux kernel image, but it could

be used to launch any application that has been designed to be launched in this way.

When entering the exec command, you can specify the following parameters:

exec [-b <virtual address>] [-l <length>] [-c “command line”] [<entry point>]

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Eurotech ZEUS Manual de usuario Pagina 63