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RE: [avr-gcc-list] an idea: adding serial sram to avr to extendheapstora

From: Weddington, Eric
Subject: RE: [avr-gcc-list] an idea: adding serial sram to avr to extendheapstorage
Date: Sun, 13 Mar 2011 11:00:20 -0600

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On
> Behalf Of Raymond Moore
> Sent: Sunday, March 13, 2011 10:53 AM
> To: address@hidden
> Subject: Re: [avr-gcc-list] an idea: adding serial sram to avr to
> extendheapstorage
> What I'm after is basically a way to extend the variables storage
> within the gcc/libc framework.  To store variables in an external sram
> rather than internal sram.  My (limited) understanding is that is the
> heap storage.  This would leave the internal sram free for stack.  I
> already have libraries for storing data in external sram but it is not
> seamless.  Have to go through extra steps to store and retrieve data,
> like using eeprom.  What I am envisioning is an addon with possibly
> compiler option or something to redirect all access to the heap to
> another sram segment completely, this particular segment being tied
> into the system via spi.  

I would strenuously object to something like this going upstream. This is an 
uncommon scenario, and it would be for specific external memory chips and 
unfairly exclude others.

If you want to do this for your copy of AVR GCC then that's your business.

AFAICT, you haven't even explained the details of your system, what chip you 
are using, and why you really think you need more memory.

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