From: Michel Lanners <mlan@cpu.lu>
To: linuxppc-dev@lists.linuxppc.org
Cc: mj@suse.cz
Subject: Re: Accessing IO space via resources
Date: Sat, 24 Jun 2000 08:32:04 +0200 (CEST) [thread overview]
Message-ID: <200006240632.IAA00722@piglet.grunz.lu> (raw)
In-Reply-To: <200006231224.OAA00765@piglet.grunz.lu>
Hi all,
On 23 Jun, this message from To: linuxppc-dev@lists.linuxppc.org echoed through cyberspace:
> Now, in the latest 2.4.0-ac kernels, ioremap() returns different
> addresses, not 1:1 the original address anymore. And of course this
> breaks the above scheme. (I've not looked into why this is so... I
> suppose it's not a bug?)
After investigating this, it turns out that early in the boot process,
before the mm system is up, ioremap returns virt == phys for
addresses >= ioremap_base. ioremap_base got changed from 0xf8000000 to
0xf0000000 in recent kernels. Anybody kow why this got changed?
Obviously, the PCI IO space was above ioremap_base before, but is below
now...
Michel
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next prev parent reply other threads:[~2000-06-24 6:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-06-23 12:24 Accessing IO space via resources Michel Lanners
2000-06-24 6:32 ` Michel Lanners [this message]
2000-06-24 21:27 ` Martin Costabel
2000-06-25 7:39 ` Michel Lanners
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