Storage Indicator: Difference between revisions
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A storage indicator is built into the XO-1.5 and XO-1.75. It is the second LED on the left. |
A storage indicator is built into the XO-1.5 and XO-1.75. It is the second LED on the left. |
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The indicator is managed by the main processsor. It is controlled by |
The indicator is managed by the main processsor. It is controlled by software. |
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== Software == |
== Software == |
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[list of possible triggers] |
[list of possible triggers] |
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echo olpc-ac-online > trigger |
echo olpc-ac-online > trigger |
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== Firmware == |
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OpenFirmware uses the storage indicator when rewriting the SPI FLASH (XO-1.5 and XO-1.75) or the EC (on XO-1.75). The laptop must be left to complete the process, and the indicator is used to show this. Interrupting the process may break the laptop. |
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OpenFirmware words (functions): |
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* ''hdd-led-on'' turns on the indicator, |
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* ''hdd-led-off'' turns off the indicator, |
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* ''hdd-led-toggle'' changes the state of the indicator. |
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== Restrictions == |
== Restrictions == |
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Latest revision as of 00:00, 13 December 2011
A storage indicator is built into the XO-1.5 and XO-1.75. It is the second LED on the left.
The indicator is managed by the main processsor. It is controlled by software.
Software
By default the indicator lights when the internal storage is accessed. A user may learn how to predict the responsiveness of the laptop by watching the indicator.
Turning on the LED and leaving it on
cd /sys/devices/platform/leds-gpio/leds/storage echo 1 > brightness
(unfortunately this requires root)
Assigning the LED to another trigger
For example, this makes the LED act as an AC online indicator:
cd /sys/devices/platform/leds-gpio/leds/storage cat trigger [list of possible triggers] echo olpc-ac-online > trigger
Restrictions
XO-1.75 C1 has the light sensor next to the storage indicator. The storage indicator is turned off briefly during each sample capture. XO-1.75 B1 and A3 do not do this.