USB OTG Boot
#11
(01-10-2016, 01:46 PM)devilsclaw Wrote: The reason why I was trying to looking at a schematic is because I got the dev board yesterday and I'm looking into starting to develop for it. Not having to pull the sdcard every time I make a simple change would be nice. I don't want to do development on the pine its self since the sdcard could get corrupt while doing kernel development or the system might become un-bootable. If the dev board is different then the other ones coming out in February then that schematic might be useless to me since I am working on the dev board. The dev people need the schematic that belongs with there boards. there should be no confusion if it is released under the wiki designated for the dev board. Also I don't see any TODO list or work that needs done in the wiki.

(01-10-2016, 12:45 PM)tllim Wrote:
(01-10-2016, 05:45 AM)Andrew2 Wrote:
(01-09-2016, 09:53 PM)devilsclaw Wrote: I tried looking for a schematic for the pine64 but there does not seem to be one.

Simple rule of thumb: don't trust a vendor that doesn't publish at least schematics. It's really that simple Smile

FEL mode should work on the A64 but if it really works on Pine64 still has to be confirmed (USB OTG is normally used together with Mini or Micro USB where an ID pin exists). The question has been asked already 4 weeks ago but the Pine guys did nothing to answer: http://forum.pine64.org/showthread.php?tid=44 

I would call this already lack of support.

As mentioned earlier, we will publish the Pine A64 schematic, but not Gerber file. The schematic will be publish when we start making the first batch delivery on February. We prefer to publish the schematic version that same as production board. Deliver several earlier versions try to satisfy some curiosity will end up more confusion.

(01-10-2016, 08:00 AM)ssvb Wrote:
Quote:Yes, micro USB is only used for DC-IN (weird decision in my humble opinion)
Since the A64 SoC only supports one USB host and one USB OTG, they had a choice between having two USB host connectors or having one regular USB host connector and one mini/micro connector for OTG.

Two USB host connectors are useful for plugging USB keyboard and USB mouse without any extra adapters and that's probably what the general public prefers.

Yes, DC-IN could alternatively use a barrel plug. But USB micro connector is the Raspberry Pi approach, which allows to use cellphone chargers instead of a dedicated power adapter. Admittedly this can lead to reliability issues if people start using shitty chargers or bad USB cables.

Whether using barrel plug or micro SD connector was my struggle when making the DC input plug. The same concern of people using shitty chargers is  and still my main concern of choosing microSD.  However, i finally gave in and decided on microSD based on following two reason.

1. There are different type of barrel plug dimension and the most common is 5x2.1mm type. However, this type of plug are use for +12V application such as network camera. We don't want to keep receiving "dead of arrival" "burned" boards due to some one just keep plug in 12V power supply into Pine A64. There is no such concern using microUSB socket.
2. If we select an unpopular one to avoid answer 1, this can become inconvenient due to cannot get them on the shelve and may keep blame us try to make money out of selling power supply.

Noted on microUSB cannot carry more current compare to barrel plug.
The developer board and production board are comes from same schematic. The only different is power LED light where developer board is green and production board is red color. We can release the schematic to developer in two to three weeks time.


Messages In This Thread
USB OTG Boot - by devilsclaw - 01-09-2016, 09:53 PM
RE: USB OTG Boot - by tllim - 01-09-2016, 10:59 PM
RE: USB OTG Boot - by Andrew2 - 01-10-2016, 05:45 AM
RE: USB OTG Boot - by tllim - 01-10-2016, 12:45 PM
RE: USB OTG Boot - by devilsclaw - 01-10-2016, 01:46 PM
RE: USB OTG Boot - by tllim - 01-10-2016, 01:57 PM
RE: USB OTG Boot - by Andrew2 - 01-10-2016, 02:43 PM
RE: USB OTG Boot - by ssvb - 01-10-2016, 07:40 AM
RE: USB OTG Boot - by Andrew2 - 01-10-2016, 07:48 AM
RE: USB OTG Boot - by ssvb - 01-10-2016, 08:00 AM
RE: USB OTG Boot - by Andrew2 - 01-10-2016, 08:17 AM
RE: USB OTG Boot - by ssvb - 01-10-2016, 08:19 AM
RE: USB OTG Boot - by ssvb - 01-10-2016, 02:45 PM
RE: USB OTG Boot - by tllim - 01-10-2016, 03:29 PM
RE: USB OTG Boot - by ssvb - 01-10-2016, 04:47 PM
RE: USB OTG Boot - by tllim - 01-10-2016, 06:04 PM
RE: USB OTG Boot - by devilsclaw - 01-10-2016, 07:20 PM
RE: USB OTG Boot - by ssvb - 01-10-2016, 09:56 PM
RE: USB OTG Boot - by janjwerner - 01-22-2016, 08:39 PM
RE: USB OTG Boot - by tllim - 01-23-2016, 11:17 AM
RE: USB OTG Boot - by ssvb - 01-23-2016, 02:27 AM
RE: USB OTG Boot - by Quintus23M - 01-24-2016, 01:51 PM
RE: USB OTG Boot - by tllim - 01-24-2016, 02:04 PM
RE: USB OTG Boot - by kenjiru - 10-24-2016, 04:27 AM
RE: USB OTG Boot - by Learnincurve - 02-24-2017, 04:15 AM
RE: USB OTG Boot - by CaptainZalo - 03-01-2017, 03:22 PM

Possibly Related Threads…
Thread Author Replies Views Last Post
  Pine Board using linux stuck during boot sequence ktaragorn 4 6,272 03-30-2019, 06:48 AM
Last Post: ktaragorn
  Secure boot & OTP efuse program devangpanchal90 0 2,165 05-25-2018, 01:59 AM
Last Post: devangpanchal90
  boot process for pine a64 awaysu 1 3,643 01-24-2018, 05:09 AM
Last Post: xalius
  Can't boot headless after running update_uboot.sh Borglesnorgle Williams 2 3,332 08-17-2017, 04:08 AM
Last Post: Borglesnorgle Williams
Exclamation Pine A64 Plus Fails to Boot grobbs 35 30,671 06-28-2017, 08:53 AM
Last Post: sarav_sara
  Boot issues: What todo when you muck up your FSTAB file Dagremote 1 2,983 04-16-2017, 10:28 PM
Last Post: pfeerick
Question Pine64 cannot boot jamiechang917 6 7,565 04-16-2017, 10:21 PM
Last Post: pfeerick
  U-Boot for A64 git longsleep 38 56,164 03-21-2017, 01:59 PM
Last Post: longsleep
  OpenWRT supports ARMv8 - arm64, u-boot problem? rgdonato 4 5,489 03-20-2017, 03:59 PM
Last Post: rgdonato
  How to boot alternative kernel image with u-boot? zhouer 3 5,505 06-27-2016, 04:15 AM
Last Post: ssvb

Forum Jump:


Users browsing this thread: 1 Guest(s)