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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