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From: Petko Manolov <pmanolov@Lnxw.COM>
To: linux-kernel@vger.kernel.org
Subject: discontig physical memory
Date: Mon, 08 Oct 2001 15:54:30 -0700	[thread overview]
Message-ID: <3BC22EA6.696604E7@lnxw.com> (raw)
In-Reply-To: <E15pWfR-0006g5-00@the-village.bc.nu> <3BC02709.A8E6F999@welho.com> <20011007150358.G30515@nightmaster.csn.tu-chemnitz.de> <3BC05D2E.94F05935@welho.com> <20011007162439.P748@nightmaster.csn.tu-chemnitz.de> <3BC067BB.73AF1EB5@welho.com> <3BC0982A.84ECBE7B@mvista.com> <3BC0D1C9.63C7F218@welho.com> <3BC0E9FD.4F3921C6@mvista.com> <3BC2158E.BE52400D@welho.com>

	Hi guys,

I ran into this problem with a SOC weird design.
The physical memory map looks like this:

	0 	-  4MB		DMA-able embedded RAM;
	4MB	- 16MB		nothing here;
	16MB	- 32MB		external RAM;

Embedded controllers (FB/USB) can see only lowest 4MB
and they need almost all of it for buffers. The kernel
is living at phy address 16Mb.

Any ideas how to make lowest 4MB allocatable throu
kmalloc(size, GFP_DMA) without breaking the kernel?


	Petko

PS: I've seen CONFIG_DISCONTIGMEM but it is not yet
implemented for MIPS and i am not sure if it is what
is required in this case.

  reply	other threads:[~2001-10-08 22:57 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-10-04 21:04 Context switch times Mike Kravetz
2001-10-04 21:14 ` arjan
2001-10-04 21:25   ` David S. Miller
2001-10-04 21:39     ` Richard Gooch
2001-10-04 21:52       ` David S. Miller
2001-10-04 21:55         ` Benjamin LaHaise
2001-10-04 22:35           ` Davide Libenzi
2001-10-04 22:49             ` Mike Kravetz
2001-10-04 22:42           ` Linus Torvalds
2001-10-04 22:53             ` Benjamin LaHaise
2001-10-05 15:13               ` Alan Cox
2001-10-05 17:49                 ` george anzinger
2001-10-05 22:29                   ` Alan Cox
2001-10-05 22:56                     ` Davide Libenzi
2001-10-05 23:04                       ` Alan Cox
2001-10-05 23:16                         ` Davide Libenzi
2001-10-05 23:17                           ` Alan Cox
2001-10-05 23:21                             ` Davide Libenzi
2001-10-05 23:43                         ` Roger Larsson
2001-10-07  1:20                     ` george anzinger
2001-10-07  1:33                       ` Bill Davidsen
2001-10-07  9:56                       ` Alan Cox
2001-10-06  2:24                 ` Albert D. Cahalan
2001-10-06  2:57                   ` Davide Libenzi
2001-10-07  9:57                 ` Mika Liljeberg
2001-10-07 13:03                   ` Ingo Oeser
2001-10-07 13:48                     ` Mika Liljeberg
2001-10-07 14:24                       ` Ingo Oeser
2001-10-07 14:33                         ` Mika Liljeberg
2001-10-07 18:00                           ` george anzinger
2001-10-07 22:06                             ` Mika Liljeberg
2001-10-07 22:31                               ` Davide Libenzi
2001-10-07 22:33                                 ` Mika Liljeberg
2001-10-07 23:49                               ` george anzinger
2001-10-08 21:07                                 ` Mika Liljeberg
2001-10-08 22:54                                   ` Petko Manolov [this message]
2001-10-08 23:05                                     ` discontig physical memory David S. Miller
2001-10-08 23:18                                       ` Petko Manolov
2001-10-08 23:29                                         ` David S. Miller
2001-10-09  0:34                                           ` Petko Manolov
2001-10-09  0:36                                           ` Petko Manolov
2001-10-09  1:37                                             ` David S. Miller
2001-10-09  2:43                                               ` Petko Manolov
2001-10-08 15:19                           ` Context switch times bill davidsen
2001-10-10  6:07                             ` Mike Fedyk
2001-10-07 18:39                   ` Davide Libenzi
2001-10-09 20:37                   ` Hubertus Franke
2001-10-09 23:50                     ` george anzinger
2001-10-11 10:52                       ` Hubertus Franke
2001-10-04 23:41             ` Mike Kravetz
2001-10-04 23:50               ` Linus Torvalds
2001-10-05 15:15                 ` Eric W. Biederman
2001-10-04 23:56               ` Davide Libenzi
2001-10-05  0:45               ` Andrea Arcangeli
2001-10-05  4:35                 ` Mike Kravetz
2001-10-07 17:59                   ` Andrea Arcangeli
2001-10-07 19:54                     ` george anzinger
2001-10-07 20:24                       ` Andrea Arcangeli
2001-10-09  4:55         ` Richard Gooch
2001-10-09  5:00           ` David S. Miller
2001-10-09 13:49           ` bill davidsen

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