theboot900

There is way too many layers of abstraction going on here, and that's just the pc software side.

That's a long time. Waiting 25 seconds for a boot up I don't get the hype in the microcontroller world for this. It's not a microcontroller, but a microcomputer. More so to compete with the Pi. Add to that everything seems so undeterministic.

That's a long boot time. Is that just first boot or every boot?

So i have had a play with the SDRAM Pad Settings. I have managed to get SDRAM running stable at 240mhz My original problem from going 198 to 221 was pad EMC_08. Just adjusting the rate on that made it stable to 227mhz. Doing some tests...

Day 18. A truck drove by, emblazoned on the side with a big Q. I refuse to go to the dark side, even if it means rescue....

As per the post above, that was fixing the SDRAM to not fail on reads when running at 221mhz So the problem i had was a bunch of extra pins not accessible through the standard digital write, as they where not defined. Also trying to map...

I wonder what the boot up time will be for the Linux soc. Milliseconds? Seconds? Tens of seconds?

Massive corporation buying up small company never ends well. Large companies are always profit driven. Theyre already releasing a completely new different ide. Soon you will be having to create a qualcom account. Any new boards will have to...

I'm not a fan and I think the buyout of arduino is not good news. To me a micrcontroller should be predictable and barebones. Not running an RTOS or Linux etc.

So anything lower than 30mhz is giving you artifacts? A lot of artifacts? I think the data sheet recommends a 25 mhz clock. This gives about a 60hz refresh rate. I've got mine set to 20mhz for a 50hz refresh rate.

I'm using the same display haha. Am using just the PT4110 recommended from buy display.

Hey, has there been any more progress on this?

Great! Post if it works If you get it running!

What about a power latching circuit with push button reading With power button held down, circuit will always turn on. As Microcontroller boots up, first thing you do is MC_Latch_On pin to high When everythings on If you press the button ...

So I finally got around to doing some more on this. After a bit of testing I've realised the sdram test was failing only on 32 bit reads. Setting the test buffer to 16 bit there would be no failures. So on the second burst of the read it must...

If you like I can upload the symbol and schematic I used for my DIY board with sdram. I outputted pretty much every pin that could be used. I used the larger 12x12 version of the chip with a 4 layer pcb, and hand solderable (smallest components...