4 Summary of the HP/Phoenix BIOS
Power Saving and Ergonometry
dog timer detects that the BIOS is inactive (and not reloading the timer once every 6 seconds), the computer is turned off without further BIOS acknowledgment.
The following table summarizes the main signals that drive or are driven by the Little Ben chip.
Signal1 | Address | Description |
SMI_OFF |
| User wants to power off: computer enters RPO shutdown mode |
|
| (computer clock, HDDs all stopped; only RTC, Little Ben and |
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| network board still active) |
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SMI_RWU ➹ | pin 69, LBen channel 7 | Signal from RTC, FAX, control panel, and power key on keyboard. |
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| Magic Frame from network board: computer wakes up from RPO |
|
| mode. |
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CoffeeBreak# ➷ | pin 66, LBen channel 0 | Connected to the lock button (coffee break) on the control panel. |
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ASL# ➷ | pin 65, LBen channel 4 | Connected to the Super IO Auto Soft Lock (ASL) timer. |
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| Reset by an interrupt from the keyboard or mouse. |
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APM | pin 67, LBen channel 2 | SMIs from the chip set pass first to Little Ben, then are sent on to |
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| the processor on the SMI# line |
SMI# |
| |
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StopClk# |
| Stops the processor clock |
|
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SMI_CONFIG |
| Tells Little Ben that the processor is in SMM |
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SMI_ACT# |
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SMI_TRIG_EN |
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SMI channels | index Ah | Used to enable individual SMI channels during the boot process |
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SMI_EN | index Bh, bit 0 | Enable general SMI generation (during the boot process) |
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SMI status register | index 10h | This register is cleared when the computer is |
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SM | index 11h, bit 1 | When set, computer mains button is disabled |
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| index 11h, bit 2 | When set, Flash ROM is write protected; Super IO space is write |
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| protected (Serial EEPROM access, serial ports configuration, |
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| parallel port configuration, flexible disk drive configuration) |
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| index 11h, bit 4 | When set, flexible disk drive is write protected |
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PWD_EN | pin 21 | Not used |
| index Dh, bit 3 |
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Super Secure Mode | pin 64 (shared with | Not used |
| FLPWPT#) |
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1.➹ indicates triggered on a rising edge; ➷ indicates triggered on a falling edge
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