On Wed, Jul 08, 2020 at 11:46:49AM +0100, Luke Kenneth Casson Leighton wrote: > On Tue, Jun 16, 2020 at 9:45 AM Pablo Rath <[email protected]> wrote: > > > > I have recieved an EOMA68-A20 2.7.4 preproduction computer card and the 1.7 > > micro desktop (MD) last week. Just for clarification these boards are > > nothing new > > and have been discussed on this mailing list. > > If some of you already have their preproduction boards ready, I would > > appreciate any help, hints and suggestions to help me getting started. > > > > Altough I have some experience with handling arm-boards I am now afraid to > > do something > > **stupid** and break/fry the boards. > > After some digging in the list-archives I found this thread ([1]) where > > Richard and > > Luke discuss how to connect the bare computer card with the bare micro > > desktop. > > I have many questions: > > 1. Connecting computer card and micro desktop: > > I am aware of the photos attached to [2]. > > Does the mentioned video exist? > > no. > > > Richard, did you send photos to Luke? (If yes, can I have them?) > > Luke, do you want me to send you photos too before apllying power? > > yes that would be good. visually it is pretty obvious. just do *not* > bend or waggle the Card as it's inserted (however you may find that > the connector is soldered at a slight angle of 1 to 3 degrees). > > from visual inspection from the top, the gap left and right should be > equal. this should be logically fairly obvious. >
Images can be found here (I could not upload them to the rhombus-tech wiki becaus a virus checker is not defined): https://www.parobalth.org/eoma68-a20/eoma68-A20_2-7-4_1.JPG https://www.parobalth.org/eoma68-a20/eoma68-A20_2-7-4_2.JPG https://www.parobalth.org/eoma68-a20/eoma68-A20_2-7-4_3.JPG https://www.parobalth.org/eoma68-a20/eoma68-A20_2-7-4_4.JPG > from visual inspection from the front, it should also be obvious if > the card has been inserted where the top row of pins has gone into the > bottom part of the connector or vice-versa. Visual inspection from the front looks good to me but is difficult to photograph with good light and correct focus. > If You Can See Pins You Got It Wrong. I can't see pins anymore. > > also, once inserted, place the anti-static bag *in between* the Card > and the MicroDesktop PCB. > Is this for anti-static purpose or to add a bit of stability? Do you fold your bag to fit the entire length of computer-card? > > > > 2. PSU for micro desktop: > > According to the mentioned thread ([1]): "5.5mm jack with a 2.1mm centre > > hole, middle is > > +ve (aka "pin positive")", "Anywhere between 7 and 21v is fine, minimum 1A, > > 1 5A is better" > > > > So I searched for a DC PSU in my household and read Wikipedia where it is > > mentioned that OD 5.5 mm / ID 2.1 mm is common on guitar effect pedals but > > my > > multi guitar effect pedal PSU did not fit (ID too small). Finally I found a > > matching DC PSU from a low volatage guitar amp. It says O / P: DC 15V, 2A > > and a symbol (positive polarity): > > L. P. S. > > - -(.- + > > you're better off checking with a multimeter. it's pretty standard > (pin positive) however there is no substitute for actually checking. > i.e.: don't guess - check. hardware is unforgiving. > Bought a multimeter and checked. DC PSU is good to go. > > Should we document this somewhere on rhombus-tech.net? > > yes, good idea. Will do it in next couple of days. > > 4. SD-card ready / U-Boot > > Tried to compile u-boot-sunxi [4] and make exits with "System not > > configured". > > So Luke, what did you use as config > > it's on the wiki somewhere. it has been 5 years so i will be > searching just as much as you would be. Ok. > > or has something changed over the years? > > no. > > > 5. Git, notes and documentation > > Finally I am wondering where to put my notes. A subpage on rhombus-tech > > seems like a good idea > > good to me > > yes. After a quick check it seems one can not create subpages from the online editor (only edit pages). Can I still send you an ssh-key to get a better access to the wiki? > > and indicates a work in progress in contrast to the various wikis > > out there. Where do you want me to push my work in progress git branches if > > I > > manage to hack something useful together? > > i never needed to make any modifications to any linux kernel or u-boot > source code, so one has not been set up. Ok. Thanks. kind regards Pablo _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
