[Arm-netbook] It arrived in the post just now!

[Henrik Nordström]

ons 2013-07-31 klockan 01:40 +0100 skrev luke.leighton:

>  surpriiise!  i take it they're aware that those buffer overruns - a
> stupid bug which i fixed in the 3.3 a20-dev code i initially tested -
> probably resulted in allwinner's employees going down a whooole slew
> of increasingly-desperate modifications to the A20 USB codebase, when
> in fact the problem was simply stack/memory corruption?

Yes, but the issues in 3.4 is different, not really A20 related even.

>  yes.  i'm running fel-boot, that works fine, loads off the uSD....
> buuuut there's nothing on the NAND (i wiped it).  that's a little
> different from bootstrapping from android.

Yes quite different, and with the fel jumper hidden it's not so easy for
anyone else to fel boot.

> > Right.. should also write up a document on how to disassemble the PCMCIA
> > casing safely so one can reach the USB-BOOT "jumper" for those who needs
> > it.
> 
>  good point.
> 
>  any chance you could put it here:
> http://rhombus-tech.net/allwinner/a20/boot/

Added http://rhombus-tech.net/allwinner/a20/EOMA68-disassembly/

Any volonteers on writing one with some nice pictures etc?

Points to empasis: (already in page but feel free to rewrite / improve /
correct)
- Be patient, don't use excessive force
- You only need to remove the "top" shield (same side as uSD slot) to
reach usb-boot jumper.
- Start from the "outside" (hdmi contacts etc).
- Push the shield gently to the side to loose it's grip. Wiggle it a bit
working up the edges.
- The metal is glued to the EOMA68 connector with adhesive tape. When
reaching the EOMA64 connector just gently bend one edge the shield for a
while until the tape looses it's grip.
- If removing both shield pieces then be very careful with the glue tape
on the bottom one, it's easy to bend the whole EOMA68 connector here
with possibly catastropic results.
- Remove tape and glue remainder before reassembly if you plan on
disassemble again. Easly rubs off with using just your fingers or hand.
- If you have removed the board from the casing entirely and want to
reassemble, pay atteion on which direction you insert the cart. The USB
connector should be oriented to the shorter edge

The USB-Boot jumper is clearly labeled "UBOOT" on the board. Hard to
miss it. Between the A20 CPU and the EOMA68 connector.

Regards
Henrik