From: Mark Salter <msalter@redhat.com>
To: cpereira@ics.uci.edu
Cc: ecos-discuss@sourceware.cygnus.com
Subject: Re: [ECOS] What's the definition of VROM memory region used for?
Date: Thu, 02 Aug 2001 17:11:00 -0000 [thread overview]
Message-ID: <200108030011.f730Bi631744@deneb.localdomain> (raw)
In-Reply-To: <Pine.SOL.4.20.0108021654380.22303-100000@washoe.ics.uci.edu>
>>>>> 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 17:11 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 [this message]
2001-08-02 17:44 ` Cristiano Ligieri Pereira
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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