3-20
Computer Group Literature Center Web Site
MOTLoad Firmware
3
listed in
Appendix C, Related Documentation
, but are noted here for
reference:
Mailbox 0 is at offset 7f348 in the CR/CSR space
Mailbox 1 is at offset 7f34C in the CR/CSR space
Mailbox 2 is at offset 7f350 in the CR/CSR space
Mailbox 3 is at offset 7f354 in the CR/CSR space
The selection of the mailbox used by remote start on an individual
MVME6100 is determined by the setting of a global environment variable
(GEV). The default mailbox is zero. Another GEV controls whether
remote start is enabled (default) or disabled. Refer to the Remote Start
appendix in the MOTLoad Firmware Package User's Manual for remote
start GEV definitions.
The MVME6100’s IBCA needs to be mapped appropriately through the
master’s VMEbus bridge. For example, to use remote start using mailbox
0 on an MVME6100 installed in slot 5, the master would need a mapping
to support reads and writes of address 0x002ff348 in VME CR/CSR space
(0x 0x7f348).
Alternate Boot Images and Safe Start
Some later versions of MOTLoad support Alternate Boot Images and a
Safe Start recovery procedure. If Safe Start is available on the
MVME6100, Alternate Boot Images are supported. With Alternate Boot
Image support, the bootloader code in the boot block examines the upper
8MB of the flash bank for Alternate Boot images. If an image is found,
control is passed to the image.
Firmware Startup Sequence Following Reset
The firmware startup sequence following reset of MOTLoad is to:
❏
Initialize cache, MMU, FPU, and other CPU internal items
❏
Initialize the memory controller