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List Archive: gentoo-embedded
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To: gentoo-embedded@g.o
From: Abhishek Amit <abhishek@g.o>
Subject: Re: Porting Applications
Date: Thu, 06 Nov 2003 22:43:06 -0800
On Thu, 2003-11-06 at 19:05, nDiScReEt wrote:
<snip>
> Since we are committing to uClibc (I have no complaints and am in complete 
> agreement, except....) that raises a new issue. Well, not entirely new but an 
> issue nonetheless. Familiar is now trying to krack down on developers and 
> contributors to provide links to their source code used to make their current 
> binary programs. The downside is that without the special patches and what 
> not, alot of useful and great programs can not be ported readily to uClibc. 
> Not saying that this is an impossibility, just saying that how do we design 
> the ebuild to port current gentoo applications to fit and function in our 
> embedded environments. Not all PDAs have the same screen size and memory 
> constraints as noted in an earlier post. As memory is an important factor, it 
> shouldn't be a penalty for those with bigger memory and displays. There 
> should be a tool that works like genmenu, in which where you use this program 
> (let us call it "genembedconf") to set the parameters for your particular 
> build of a embedded system (ie the HP iPAQ H3955 is a 400MHz Intel XScale 
> PXA250 hwhich has 32MB flash ROM, 64MB SDRAM,  and 240x320 16-bit display.) 
> We would want it to be compiled for a pxa and have all apps be ported to a 
> display size of 240x320 with rotation capability.  On the other hand, Sharp 
> Zaurus C-7[56]0 display is 640x480 with 128MB of storage (of which 64MB is 
> always for storage), and it's hardware processor is a Intel XScale PXA255. 
> Then, of course, there is the ARM. So creating an gentoo embedded 
> configuration tool I think would simplify creating cross-compiling toolchains 
> and target-specific compiled code. I hope I conveyed my thoughts clearly 
> enough so that everyone understands what I am talking about. As I have been 
> up for far too long to mention and am now in dire need of some much needed 
> sleep. 
I don't see the need for a configuration tool. All you have to set are
CFLAGs and chose a libc, a choice which will be influenced by the amount
of memory on the device. Screen resolution has little effect when
building the package, unless it has multiple front ends, such as a QT
front end, a GTK one, a QT/E one, and the list goes on. In such cases I
feel USE flags should be used to determine which front ends are built. I
have yet to see applications with built in rotation. Environments such
as OPIE or I'm sure X handle this AFAIK. You use the same toolchain for
building ARM and PXA binaries, just with different CFLAGS(and obviously
the toolchain has to support PXA, but it is not a separate toolchain). 
Just my 2 cents,
-- 
Abhishek Amit <abhishek@g.o>
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References:
Porting Applications
-- nDiScReEt
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Updated Jun 17, 2009

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