Motorola MVME3100 用户手册
MVME3100 Single-Board Computer Installation and Use (V3100A/IH1)
Chapter 3 MOTLoad Firmware
30
Firmware Scan for Boot Image
The scan is performed by examining each 1MB boundary for a defined set of flags that identify
the image as being Power On Self Test (POST), USER, or Alternate MOTLoad. POST is a user-
developed Power On Self Test that would perform a set of diagnostics and then return to the
bootloader image. USER would be a boot image, such as the VxWorks bootrom, which would
perform board initialization. A bootable VxWorks kernel would also be a USER image. Boot
images are not restricted to being MB or less in size; however, they must begin on a 1MB
boundary within the 8MB of the scanned flash bank. The Flash Bank Structure is shown below:
the image as being Power On Self Test (POST), USER, or Alternate MOTLoad. POST is a user-
developed Power On Self Test that would perform a set of diagnostics and then return to the
bootloader image. USER would be a boot image, such as the VxWorks bootrom, which would
perform board initialization. A bootable VxWorks kernel would also be a USER image. Boot
images are not restricted to being MB or less in size; however, they must begin on a 1MB
boundary within the 8MB of the scanned flash bank. The Flash Bank Structure is shown below:
The scan is performed downwards beginning at the location of the first possible alternate image
and searches first for POST, then USER, and finally Alternate MOTLoad images. In the case of
multiple images of the same type, control is passed to the first image encountered in the scan.
and searches first for POST, then USER, and finally Alternate MOTLoad 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:
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
Addr FFD00000 Size 00100000 Flags 00000003 Name: MOTLoad
boot> c
NOPQRSTUVabcdefghijk#lmn3opqrsstuvxyzaWXZ
Copyright Motorola Inc. 1999-2004, All Rights Reserved
MOTLoad RTOS Version 2.0, PAL Version 0.b EA02
Address
Usage
0xFFF00000 to 0xFFFFFFFF
Boot block. Recovery code
0xFFE00000 to 0XFFFFFFFF
Reserved.
(MOTLoad update image)
(MOTLoad update image)
0xFFD00000 to 0xFFDFFFFF
First possible alternate image
(Bank B / Bank A actual)
(Bank B / Bank A actual)
0xFFC00000 to 0xFFCFFFFF
Second possible alternate image
(Bank B / Bank A actual)
(Bank B / Bank A actual)
....
Alternate boot images
0xFF899999 to 0xFF8FFFFF
Bottom of Flash
(Flash size varies per product)
(Flash size varies per product)