Using Axis ETRAX developer board
Axis Developer Board 100Mhz CPU, 2MB
Flash 8MB RAM
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+ Linux kernel with open source firmware
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+ Low power consumption <1A
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+ Have ethernet connection!
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- Can CPU decode MP3 directly?
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- No clear audio DAC interface
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- Somewhat expensive $300
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- ATA interface directly from developer board may be difficult.
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- Need to write Linux Audio driver for ETRAX and own DAC solution