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| TABLE | IPMI Thresold Sensors (Continued) |
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| Lower |
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| Upper |
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Sensor | Name | Type | Description | Units | Thresholds |
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| Thresholds |
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30 | Site 2 | Thresh | AMC Slot | Volts | n/a | n/a | n/a | 3.456 | 3.514 | 3.6 |
| MP |
| Managem |
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| ent Pwr |
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31 | Site 3 | Thresh | AMC Slot | Amps | n/a | n/a | n/a | 5.5 | 6.023 | 6.517 |
| Pwr |
| current |
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| Cur |
| sense |
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32 | Site 3 | Thresh | AMC Slot | Volts | n/a | n/a | n/a | 13.048 | 13.44 | 13.608 |
| Pwr |
| +12V |
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33 | Site 3 | Thresh | AMC Slot | Volts | n/a | n/a | n/a | 3.456 | 3.514 | 3.6 |
| MP |
| Managem |
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| ent Pwr |
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4.2uBoot
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.
4.2.1uBoot 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.
CPU: | 400 | MHz | |
DRAM: | 256 | MB |
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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
Press any key before ### JFFS2 loading 'image1' to 0x400000 appears.
Chapter 4 Configuring Switch Software |
