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Boot File Location Information
372
AlterPath OnBoard Administrator’s Guide
Boot File Location Information
How the OnBoard boots is introduced at a high level in “Configuring the Boot
File Location” on page 152. The additional information in this section is to
give an administrator who has the root password enough background to be
able to boot from an alternate image if the need arises and if the Web Manager
is not available.
The OnBoard uses a U-Boot boot loader that resides in soldered flash memory
and that automatically runs at boot time. U-Boot boots the OnBoard from an
image whose location is configurable. The image can reside either in a
separate removable flash memory on the OnBoard or on a boot server on the
network.
Up to two images may be stored at the same time on the OnBoard’s removable
flash. Each image on the removable flash has three separate file systems
mounted on three Linux partitions. The first partition for each image contains
the kernel, the second partition contains the root filesystem mounted read
only, and the third partition contains the configuration files mounted read-
write.
For more about U-Boot in general, go to:
http://sourceforge.net/projects/u-
boot
.
The OnBoard boots from alternate images as described below.
•
The OnBoard initially boots from a software image referred to as
“image1,” which is stored in three partitions on the removable flash
(
hda1
,
hda5
, and
hda7
).
•
The first time you download and install a new software version from
Cyclades, the new image is stored as “image 2” in another set of three
identical partitions on the removable flash (
hda2
,
hda6
, and
hda8
), and
the configuration is changed to boot the OnBoard from “image2.”
•
The second time you download a new software version, the latest image is
stored as “image1” in the first set of three partitions, and the OnBoard
configuration is changed to boot from “image1.”
•
Subsequent downloads are stored following the same pattern, alternating
“image1” with “image2.”
Содержание AlterPath OnBoard
Страница 36: ...xxxvi AlterPath OnBoard Administrator s Guide...
Страница 108: ...Understanding How Configuration Changes Are Handled 72 AlterPath OnBoard Administrator s Guide...
Страница 116: ...Overview of Web Manager Menus 80 AlterPath OnBoard Administrator s Guide...
Страница 146: ...Configuring Regular Users Wizard 110 AlterPath OnBoard Administrator s Guide...
Страница 160: ...Upgrading AlterPath PM IPDU Software 124 AlterPath OnBoard Administrator s Guide...
Страница 194: ...Configuring an Alternate Help File Location 158 AlterPath OnBoard Administrator s Guide...
Страница 292: ...Configuring Private Subnets and Virtual Networks 256 AlterPath OnBoard Administrator s Guide...
Страница 344: ...Using the create_cf Command When Troubleshooting 308 AlterPath OnBoard Administrator s Guide...
Страница 406: ...Understanding Address Configuration for Connected Devices 370 AlterPath OnBoard Administrator s Guide...
Страница 446: ...410 AlterPath OnBoard Administrator s Guide...
Страница 460: ...424 AlterPath OnBoard Administrator s Guide...