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For the ext2 filesystem here is a link:
**broken link removed**
On ext3 you have bad luck. AFAIK your only chance is to "grep" a known string of your lost file over the partition (/dev/hdX) to find the sectors where the file have been stored.
GPRS modem
Hi,
This depends on the modem. Normally theyhave a serial port which you can hook at one of the AVR UARTs.
Then you need a data book of the modem to learn about the protocol (e.g. AT-commands) it uses on the serial port.
After that you can begin developing the AVR firmware.
If you want to have real-time you may consider using RTAI for Linux:
https://www.rtai.org/
A nice environment tor industrial-strength embedded linux is ELinOS from Sysgo:
**broken link removed**
Quite expensive but offers a good tool for configuring Kernel and root file system simply. Saved...
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