From: Cristiano Ligieri Pereira <cpereira@ics.uci.edu>
To: Mark Salter <msalter@redhat.com>
Cc: ecos-discuss@sourceware.cygnus.com
Subject: Re: [ECOS] What's the definition of VROM memory region used for?
Date: Thu, 02 Aug 2001 17:44:00 -0000 [thread overview]
Message-ID: <Pine.SOL.4.20.0108021736430.22303-100000@washoe.ics.uci.edu> (raw)
In-Reply-To: <200108030011.f730Bi631744@deneb.localdomain>
How this mapping is implemented? MMU? I've seen some macros in the flash.c
files (FLASH_P2V) but honestly I'm still confused on how this mappping
happens...
Cristiano.
------------------------------------------------------------
Cristiano Ligieri Pereira - http://www.ics.uci.edu/~cpereira
On Thu, 2 Aug 2001, Mark Salter wrote:
> >>>>> Cristiano Ligieri Pereira writes:
>
> > I've seen it in the XScale IQ80310 port and couldn't figure out what's
> > the purpose of it.
>
> > Some clarification is appreciated.
>
> Its part of the trickery with fixed_vectors on the IQ80310. Flash is at
> address zero, but that is where the CPU looks for exception vectors and
> where the arm hal expects the exception vectors to be. VROM is the 4K
> page which maps virtual address zero (where the vectors need to be) to
> RAM so that the vectors are writable.
>
> --Mark
>
next prev parent reply other threads:[~2001-08-02 17:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-02 16:57 Cristiano Ligieri Pereira
2001-08-02 17:11 ` Mark Salter
2001-08-02 17:44 ` Cristiano Ligieri Pereira [this message]
2001-08-02 18:07 ` Mark Salter
2001-08-02 21:02 ` Cristiano Ligieri Pereira
2001-08-03 4:50 ` Mark Salter
2001-08-03 7:59 ` Cristiano Ligieri Pereira
2001-08-03 8:14 ` Mark Salter
2001-08-03 9:21 ` Cristiano Ligieri Pereira
2001-08-03 9:28 ` Mark Salter
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