On Tue, Dec 1, 2015 at 4:05 PM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
... the only 2 parts of PCB1 that need to be checked and debugged are the MicroSD card slot
confirmed working. the GPIO pin of the T-FLASH slot had not been soldered, despite having 260 Centigrade temperatures applied from an IR heat lamp placed 2cm above it for around 4 minutes. soldering iron took care of that, and the micro-sd card slot on PCB1 is operational.
that means that the laptop can boot directly from external micro-sd, now, when using an A20 CPU Card. reason: space is so tight on the 6-layer 43x78mm EOMA68-A20 PCB that it was impossible to route SDC0 over to the *opposite* side of the PCB whilst at the same time crossing SDC3 in the reverse direction, as the A20 and the DDR3 RAM take up the centre of the board, leaving very little space for routing. there are only 3 signal layers (TOP, BOTTOM, layer3).
just the TDA2822 amplifier circuits and the microphone to verify as operational, and to track down why the LCD is wobbly, and PCB1 is done.
l.