[Oberon] RISC.img format

[enso]

SD cards are not entirely KISS, but close (or is it MMC that is 
simple?).  Well, if you read

https://en.wikipedia.org/wiki/MultiMediaCard
https://en.wikipedia.org/wiki/SD_cards

you should be satisfyingly confused.

Ignoring the multiplicity of standards overlaid onto SD / MMC, you can 
talk to all cards with a simple SPI port; the only complication is the 
requirement to go slow until a faster rate is negotiated. Communication 
is relatively simple once you figure out a consistent way to initialize 
the card (that works for all the different brands), mostly reading and 
writing fixed-size 'sectors'.

Unlike USB and HDMI, you can use a few FPGA pins directly connected to 
the port and no proprietary 'black boxes'.

Like VGA and PS/2, these are from a simpler time, before businesses 
blindly followed the Jobsian obfuscation requirements to keep 
'consumers' from 'looking under the hood' or 'knowing what they want'.

On 02/13/2016 05:55 AM, eas lab wrote:
> Yes SDs are magically cost-effective.
> And the problem about finite-life and <even wearing> seems not relevant.
> I guess they don't have the monsterous software requirement problem that
> USB has, since they don't need to ID what class of USB they are.
> Another example of KISS ?
>
> Does any of the ETHO documentation describe the SD driver, down to the
> register level?
>
> == Chris Glur.
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon
>