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Subject: Re: Open hardware for RockBox

Re: Open hardware for RockBox

From: Michael Sparmann <>
Date: Fri, 25 Feb 2011 22:59:04 +0100

> My question is what sort of hardware could you get away with. For
> instance what if you had a bare ARM core and some SDRAM over a EPI
> interface? Or what if you had just a tiny < 100 kB SRAM built into the core?

Currently the absolute minimum seems to be in the region of ~2MB of RAM.
If you want full functionality, you should consider taking 8MB or more.
Having fast in-core RAM is of course always nice, but only having
external RAM won't hurt much if the interface to it is reasonably fast.

I have absolutely no idea what EPI is, but the external memory will need
to be mapped into the CPU's address space, so most SoCs will probably
need a RAM with a mobile SDRAM or mDDR interface.

> Presumably all of these SoC use different drivers for the user
> interface, the porting process must be quite lengthy...

But, as you usually have documentation for that hardware, far less
lengthy than the porting process to devices that need to be reverse


Received on 2011-02-25

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