The A20 is a great little board with one issue that causes major issues when on battery power. The 3.3V regulator is only a buck type so needs a voltage higher than the output to provide a stable output. This should really be a buck/boost type so that it can still provide 3.3V output even if the battery voltage drops to or lower than 3.3V.
If you do a re-spin of this board, I would like to see this regulator changed.
Oh, and bring the POWER button to a connector :)
I second this! :)
And what about fixing the I2S lines ? They are multiplexed with some other stuff ( dont recall exactly, but i think it was sata power or so). This makes the i2s on the a20 not functional and a joke. I2s was why i bought this board originaly, but there was never any kind of answer to this problem and typical for olimex also never any kind of support.
I created my own design, so i can use i2s now, but i was very disappointed bevause of the lack of support. A20 is useless for hifi audio applications :(