Chapter 4
Configuring Switch Software
4-5
4.2
uBoot
uBoot is the boot loader. Much like a BIOS, it brings the system to a usable state for
the operating system (OS) to boot. It also performs a POST of the CPU subsystem. It
can be used as a recovery console if the firmware image becomes corrupt or a
firmware update fails. Several important environment variables are stored in uBoot,
only some of which should ever be changed, namely
noekey
and
baudrate
.
4.2.1
uBoot Console
To get to a uBoot console, you must prevent the switch from booting into the OS.
Shown here is an example of the start of a boot sequence.
Press any key before
### JFFS2 loading 'image1' to 0x400000
appears.
30
Site 2
MP
Thresh
AMC Slot
Managem
ent Pwr
Volts
n/a
n/a
n/a
3.456
3.514
3.6
31
Site 3
Pwr
Cur
Thresh
AMC Slot
current
sense
Amps
n/a
n/a
n/a
5.5
6.023
6.517
32
Site 3
Pwr
Thresh
AMC Slot
+12V
Volts
n/a
n/a
n/a
13.048
13.44
13.608
33
Site 3
MP
Thresh
AMC Slot
Managem
ent Pwr
Volts
n/a
n/a
n/a
3.456
3.514
3.6
CPU: 400 MHz
DRAM: 256 MB
FLASH: 64 MB, Base, Primary Flash
### JFFS2 loading 'image1' to 0x400000
Scanning JFFS2 FS: . done.
### JFFS2 load complete: 10026940 bytes loaded to 0x400000
Booting ...
Loading Ramdisk to 0fdf6000, end 0ff8d551 ... OK
TABLE 4-4
IPMI Thresold Sensors
(Continued)
Sensor
Name
Type
Description
Units
Lower
Thresholds
Upper
Thresholds
Summary of Contents for Sun Netra CP3240
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Page 131: ...Index 2 Sun Netra CP3240 Switch Installation Guide September 2009 ...