From: Brendan Simon <bsimon@ctam.com.au>
Cc: linuxppc-embedded <linuxppc-embedded@lists.linuxppc.org>
Subject: linuxppc-embedded: memory map question.
Date: Thu, 16 Dec 1999 10:10:35 +1100 [thread overview]
Message-ID: <38581FEA.9E970D7A@ctam.com.au> (raw)
In-Reply-To: 3857EAF8.491F842@netx4.com
Dan Malek wrote:
> As I have explained before, the IMMR and possibly a few other
> board control registers must have physical addresses above
> 0x80000000. This is because the early kernel initialization
> will map these 1:1 virtual to physical. They are needed before
> the kernel VM allocator has been initialized. If they are
> below this address, they clash with the user virtual space,
> so depending upon the loading of programs and libraries, you
> left a big virtual hole into kernel managed hardware.
My IMMR is 0xFF000000. I basically followed the BSE-IP stuff when I ported
linuxppc to our own board. This is above 0x80000000 so this should be fine,
but I do have some peripherals (LEDs, etc) mapped to memory lower than
0x8000000 (eg 0x20000000). Is this good or bad ?
Would it be better if I memory mapped everything above 0x80000000 (except
DRAM of course) ?
Brendan Simon.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-12-15 23:10 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-12-15 5:55 linuxppc embedded boot problems Brian Kuschak
1999-12-15 5:22 ` linuxppc-embedded: /bin/sh wont run from nfsroot Brendan Simon
1999-12-15 11:00 ` Jim Chapman
1999-12-15 18:56 ` Alan Mimms
1999-12-15 20:09 ` Dan Malek
1999-12-15 21:27 ` Richard Hendricks
1999-12-15 21:37 ` Alan Mimms
1999-12-15 22:13 ` Dan Malek
1999-12-16 14:52 ` Richard Hendricks
1999-12-15 19:24 ` Dan Malek
1999-12-15 23:10 ` Brendan Simon [this message]
1999-12-16 9:37 ` linuxppc-embedded: programs " Brendan Simon
1999-12-15 22:40 ` linuxppc-embedded: /bin/sh " Brendan Simon
1999-12-16 0:24 ` Brendan Simon
1999-12-16 2:17 ` Brendan Simon
1999-12-15 19:11 ` Dan Malek
[not found] ` <ot66y035bv.fsf@thinktwice.zoftcorp.dk>
1999-12-15 22:29 ` Brendan Simon
1999-12-15 19:06 ` linuxppc embedded boot problems Dan Malek
1999-12-15 22:56 ` Brendan Simon
1999-12-16 5:03 ` Dan Malek
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