3-22
Computer Group Literature Center Web Site
MOTLoad Firmware
3
The scan is performed downwards from boot block image and searches
first for POST, then USER, and finally MCG images. In the case of
multiple images of the same type, control is passed to the first image
encountered in the scan.
Safe Start, whether invoked by hitting ESC on the console within the first
five seconds following power-on reset or by setting the Safe Start jumper,
interrupts the scan process. The user may then display the available boot
images and select the desired image. The feature is provided to enable
recovery in cases when the programmed Alternate Boot Image is no longer
desired. The following output is an example of an interactive Safe Start:
ABCDEInteractive Boot Mode Entered
boot> ?
Interactive boot commands:
'd':show directory of alternate boot images
'c':continue with normal startup
'q':quit without executing any alternate boot image
'r [address]':execute specified (or default) alternate image
'p [address]':execute specified (or default) POST image
'?':this help screen
'h':this help screen
boot> d
Addr FFE00000 Size 00100000 Flags 00000003 Name: MOTLoad
Address
Usage
0xFFF00000 to 0xFFFFFFFF
Boot block. Recovery code
0xFFE00000 to 0XFFFFFFFF
Reserved for MCG use.
(MOTLoad update image)
0xFFD00000 to 0xFFDFFFFF
(FBD00000 or F7D00000)
First possible alternate image
(Bank B / Bank A actual)
0xFFC00000 to 0xFFCFFFFF
(FBC00000 or F7C00000)
Second possible alternate image
(Bank B / Bank A actual)
....
Alternate boot images
0xFF899999 to 0xFF8FFFFF
(Fb800000 or F3800000)
Last possible alternate image
(Bank B / Bank A actual)