[rtl] Power-Up and shutdown

[Vernon Van Steenkist]

I am thinking about using Linux or Real Time Linux for a mobile unit.
This unit would be activated when power is applied and deactivated when
power is removed. I only plan to use flash memory (IDE flash) for
storage. My questions are as follows:

1) I need my device to be active 5 seconds after power-up. Can Linux
   come up that quickly?

2) I can not use the shutdown command to turn off the device. The
   device will be turned off when power is removed. Will I incur any
   file system corruption issues?

Any experience or advice would be greatly appreciated.

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Re: [rtl] Power-Up and shutdown

[Bernhard Kuhn]

Vernon Van Steenkist wrote:

 1) I need my device to be active 5 seconds after power-up. Can Linux
come up that quickly?

Depends on the BIOS ... but usualy, EmbeddedPCs can´t be up
and running that fast. Linux itself can be downsized to operate
within a few seconds. The AXIS-Web/ModemCam based on uClinux (m68knommu),
for example, is fully operational within 5 seconds after
supplying power.



 2) I can not use the shutdown command to turn off the device. The
device will be turned off when power is removed. Will I incur any
file system corruption issues?

mount the root-filesystem read-only and create a (umsdos)-partition
for the data (reiserfs isn´t an option, as it usualy needs
30MB for the journal)

Bernhard
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