From: Dan Malek <dan@embeddededge.com>
To: caokai <tk19@taikebj.com.cn>
Cc: "linuxppc-embedded@lists.linuxppc.org"
<linuxppc-embedded@lists.linuxppc.org>
Subject: Re: 8xx's IMMR can not be 0x12200000?
Date: Thu, 29 Aug 2002 01:37:18 -0400 [thread overview]
Message-ID: <3D6DB30E.6060509@embeddededge.com> (raw)
In-Reply-To: 3D6D7B65.DC29B971@taikebj.com.cn
caokai wrote:
> But if I set IMMR to 0xFF000000, the linux kernel can work good.
> I think this limitation must be somewhere in the
> arch/ppc/kernel/head_8xx.S.right?
It's a requirement to be mapped at a very high address like this for
the kernel to work properly. This is due to the early memory mapping
required by the kernel to access devices in this space. There is lots
of discussion about this if you search the e-mail archives and FAQs.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-08-29 5:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-29 1:39 8xx's IMMR can not be 0x12200000? caokai
2002-08-29 5:37 ` Dan Malek [this message]
2002-09-04 13:20 ` WRITE_THRU on 8xx missing Joakim Tjernlund
2002-09-04 22:27 ` Joakim Tjernlund
2002-09-05 2:12 ` Dan Malek
2002-09-05 7:28 ` Joakim Tjernlund
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