[Efi332] Building newlib/libgloss for MPC555

[Paul Helmuth]

Dave,

This isn't going to be a great deal of help, but the IBM RS6000 was (maybe 
is) a line of mini-computers (at least what we used to call a mini-computer) 
from IBM that ran IBM's flavor of Unix (which was AIX). From what I have 
seen in some code fragments and other miscellaneous references, I think the 
RS6000's must have been based on IBM's PowerPC processors.

Hopefully one of the other guys that have dug through the details of 
building GCC (or at least a library) will ring in with the real answer to 
your question regarding the correct symbols/constants to have defined for 
GCC compiling on Win32 for the PowerPC target.

-Paul


----- Original Message ----- 
From: "David Eicher" <sailors3 at comcast.net>
To: <efi332 at diy-efi.org>
Sent: Sunday, July 24, 2005 11:30 AM
Subject: [Efi332] Building newlib/libgloss for MPC555


> Hello,
>
> Okay, I'm starting to get oriented here a bit. I'm trying to figure out 
> what
> configure does, and what to use for host and target (what configure does
> with these arguments).
>
> My host is WindowsXP (win32?), but config.sub doesn't recognize that as a
> valid alias for anything, not sure if configure will accept that.
>
> My target is MPC555, but in this context is that just powerpc? Not sure 
> what
> configure does with the target info I give it. Maybe it uses that to 
> select
> the appropriate libgloss?
>
> I'm trying to understand which libgloss to use, don't know if it is more
> appropriate to use m68k or rs6000. What actually is rs6000, when I do a
> google search on it I just get IBM RS6000 server (a complete computer, not 
> a
> processor chip).
>
> Little by little I'm unraveling the mystery here, building this library 
> will
> probably take 5 minutes, when I have all the info I need.
>
> Thanks,
>
> Dave
>
>
> -----Original Message-----
> From: efi332-bounces at diy-efi.org [mailto:efi332-bounces at diy-efi.org] On
> Behalf Of Gunter Magin
> Sent: Friday, July 22, 2005 6:02 AM
> To: efi332 at diy-efi.org
> Subject: Re: [Efi332] Standard GNU C library for CYGWIN
>
> On Fri, Jul 22, 2005 at 05:21:31AM -0700, David Eicher wrote:
>> Has anyone built a standard C library for the GNU C running on cygwin? 
>> I'm
>> looking for the prinf( ) function (and others), that have been 
>> re-directed
>> to the SCI serial interface for MPC555/565.
>
> The "standard C library" you are looking for is newlib, and I vaguely
> remember you have been checking that option a couple weeks ago.
>
> What you need is libgloss, which some people call board
> support package. Try to understand the files and concepts in
> newlib-x.xx.x/libgloss/rs6000. Some of the supported boards have a
> bootloader monitor, where the application jumps in for UART service via
> a SW trap interface (you probably don't have that). Other systems rely
> on an underlying operating system, more precisely on the BSP of that
> OpSys.
>
> Probably your system isn't supported directly, and you are operating on
> the naked HW, so you have to supply your own libgloss by implementing
> read(), write(), open(), sbrk() and friends, by just using the HW.
> You may find an pure SCI driver or fragments of that driver also in the
> 68k libgloss tree, e.g. for the 6833x.
>
> For printf you probably only need to populate write(), while other
> functions can be stubbed. The linker will tell you by its error messages
> what is really needed.
>
> gm
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