[Arm-netbook] GR8 based EOMA68 card

[Allan Mwenda]

Do it! The more cards the merrier.

On 11 May 2017 03:05:24 GMT+03:00, "Ismo Väänänen" <ismo.vaananen at gmail.com> wrote:
>Hello,
>
>The recent talk about de-blobbing R8 and thus also GR8 inspired me to
>do a
>quick write up on how I see a Next Thing Co. GR8 System-In-Package chip
>being used in an EOMA68 compatible card.
>The latest version of the write up can be found here:
>https://sites.google.com/site/oh2ftg/eoma68/eoma68-gr8
>
>I named the project "EOMA68-GR8" because why not.
>
>Like Vincent I'm doing this on the side and also with Altium.
>I haven't done anything this complex in Altium before it's likely going
>to
>be an interesting challenge.
>
>GR8 has TTL/RGB LCD interface, USB2.0, I2C, SPI(SDMMC) and so on.
>All the interfaces to make a compute card compatible with EOMA68 are
>there.
>Except if I want the card to have "front facing" USB I'll need to
>include
>some USB HUB chip like TI TUSB2046, which conveniently has no firmware
>being a state machine.
>
>I'll have to look at how the interrupts go, at AXP209 PMIC and it's
>routing.
>And decide on if I'll layout the NAND as the talk about blobs being
>required for NAND support sounds worrying. That and seeing in general
>if
>even a half reasonable layout is possible on 4-layer FR4 to get cheaper
>rates on the pcb's. At least there's no DDR RAM to route, but the
>TTL/RGB
>fanout and length matching is gona be chore.
>One more good reason to learn how the automated length matching in
>Altium
>works.
>
>Sourcing connectors and housings in small quantities. All that fun
>stuff.
>
>If anything I have missed comes to mind please mention it, I'd rather
>hear
>it now then when I have prototype pcb's at hand or layout nearly done.
>
>Cheers,
>Ismo Väänänen de OH2FTG alias 2ftg

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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