Re: [ECOS] What is the different between "ROM" and "ROMRAM" in the Bootup type ??

["Steven_cheng" <05071 at alphanetworks dot com>]

Dear Andrew,

    Thank you for you reply, but I still confuse about the following
questions.

1) When the board  powers on, does the CPU need to know which type and
vendor
of ROM flash?? (ex. AMD 29LV040B)

2) How does the CPU know the memory address which the ROM locates ??
because the files (xxx_romram.ldi/xxx_romram.h) only define the
RAM address and size.

Thnak you very much.

// Steven


----- Original Message ----- 
From: "Andrew Lunn" <andrew@lunn.ch>
To: "Steven_cheng" <05071@alphanetworks.com>
Cc: <ecos-discuss@sources.redhat.com>
Sent: Friday, July 01, 2005 8:49 PM
Subject: Re: [ECOS] What is the different between "ROM" and "ROMRAM" in the
Bootup type ??


> On Fri, Jul 01, 2005 at 05:48:45PM +0800, Steven_cheng wrote:
> > Hi All,
> >
> >     What is the different between  "ROM" and "ROMRAM" in the Bootup type
??
> >
> > Reference to the description of the configure tool :
> >
> >     This option is used to control where the application program will
run,
> > either from RAM or ROM (flash) memory. ROM based applications must be
self
> > contained, while RAM applications will typically assume the existence of
a
> > debug environment, such as GDB stubs.
> >
> >
> >
> > But What is the different between "ROM" and "ROMRAM"  ??
>
> ROMRAM starts in ROM, but copies itself into RAM.
>
>         Andrew
>
> -- 
> Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
> and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
>


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